International Ursigram and World
Days Service
LU‑W‑D‑S.

Synoptic Codesfor
Solar and Geophysical Data
1963

Published by the I.U.WD.S.

Secretariat,Utrecht, Netherlands

InternationalUrsigram and World
Days Service
I.LLW.D.S.

Synoptic Codesfor
Solar and Geophysical Data

Additional copies may

be obtained from one of the following addresses:

L.D. de Feiter, Secretary
IUWDS
Steering Committee
Sterrewacht "Sonnenborgh",
13 Servaas Bolwerk, Utrecht, Netherlands
Miss J. V. Lincoln, Deputy
Secretary IUWDSSteering Committee
C.R.P.L., National Bureau of Standards
Boulder. Colorado. U.S.A.

CONTENTS
Page
PART

A GENERAL

INFORMATION

1. Introduction 5
2. Aims and Structure of IUWDS, and present membershipof the IUWDSSteering Committee 7
3. Organisation of the Ursigram Service 12
4. Addresses of the Regional Warning Centers and Associ‑ate Regional Warning Centers 14
5. Ursigram Broadcasts 19
6. Priority list for interchange among Regions 21

PART

B CODESI. Solar

OpticalObservations 29

I. 1 Sunspots; USSPO, USSPM 30
1.2 Solar Flares; UFLAR, UFLAC,
UPATA 35
I. 3 Calcium Plages and Centers of Activity; UPLAG,
UPDIA 41
1.4 Solar Corona; UCORA 45
II. Solar

Radio

Observations 53

II. 1 Flux measurementson discrete frequencies;
URANA,URANP,
URANE 54
II. 2 Spectrographic Observations; URANT,URANS 63
II. 3 Interferometric Observations; URALA,URALO 68
III. Io n o s p h e r i c Observations 77
III. 1 Critical Frequencies; UFOFA,UFOFE 78
III. 2 Sudden Ionospheric Disturbances; USIDA,
III. 3 Cosmic Noise Absorption; UABSB 86

UDISE

82

IV. Geomagnetic

andauroralactivity 93

IV. 1 Geomagnetic
Activity Indices and Special Events;
U'MAGA 94
IV. 2 Auroral Observations; UAURA 96
V. Alert

Messages 101

V. 1 Advice from Regional Warning Centers; ADV‑‑ 102
V. 2 Alert Messages for the IQSY; ADALERT,GEO ALERT 104
VI. Specialized

Network 112

VI. 1 Radio Propagation Indices; PROPA,
PQ‑, N‑Q 114
VI. 2 Radio Propagation Forecasts; PREVI, ST‑, MT‑,AD‑ 117
VI. 3 Detailed Riometer Data; SRIOD, SRIOM 121
VI. 4 Detailed Ionospheric Data; ION‑‑ 126
VI. 5 Detailed Cosmic Ray
UCOSA,UCOSB 13CPART

C LISTSOFOBSERVATORY

Data; CORAJ,

INDICATORS 1

I. Observatories in numerical Order 1
II. Observatories in alphabetical Order 1PART

D INDEXOF MENTIONEDRAYCO,

CODES

PART

A

1. INTRODUCTION.

Summaries of Solar and Geophysical data sent by telegram
or
Ursigrams, are normally
radio broadcast, the so‑called
cast into simple synoptic codes when collected, interchan‑ged and distributed in the rapid exchange plan coordinatedby the International
Ursigram
and
World
Days
Service(IUWDS).
This booklet includes the explanationof the codes currently used in this exchange plan.
Only those codes which are in current and widespread use
are included in this booklet. In most cases these are theso‑called Universal interchange codes (identified by key
words beginning with the letter U), which are designed
according to the same principle. Also these codes provide
just the amount of scientific information for which a rapid
exchange is needed. In some cases, however, a more de‑tailed report from a limited number of stations is needed;
e.g. time variation of cosmic rays during disturbed periods.
This type of information can be encoded in the codes,
which are presented in section VI, the Specialized network
codes.
Inin these regions only
some Regions special codes for use
have been designed. These regional codes however are pro‑
gressively being replaced by the equivalent universal inter‑change codes. This development
is stimulated by the
IUWDSSteering Committee,
because it is felt highly de‑sirable that a uniform system of codes be in use for bothregional and inter‑regional purposes.
A manual containing essentially all the solar and geophy‑sical codes in use anywhere during the past decade has been
published in loose leaf form by the URSI Secretariat in 1960
with supplements issued when needed. This manual should
be considered as the reference book for all codes.
Itthe COSPAR
Unified Synoptic Codes for rapid communica‑tion of satelliteorbital data, even though this information
passes through some of the same communication
channels
as the solar‑geophysical summaries. The IUWDS
cooperates
with COSPAR
in this work and coordinates
the so‑called
SPACEWARN
system for international interchange of satel‑
lite information. The explanation of the codes used in thiswork has been published in COSPAR
Information Bulletin
No. 9 1962.
In designing this present IUWDS
code booklet, we have
tried to make it convenient for the everyday user of the
Ursigrams to work with codes in an efficient and accurate
way. Thus all particulars of a code are to be found in one
place and all codes are described according to the same
scheme. In addition different colours of paper have beenused for codes of different disciplines, and ample space isprovided for notes by the user.
The preparation of this code booklet has been
timed toassistthe World Days programof the International
Quiet
Sun
Years
1964‑1965 (IQSY),
when it is ex‑pected that the interest in
rapid interchange of current
solar‑geophysical data will reach or
surpass the level
reached during the IGY. This booklet is a necessary com‑panion to the IQSY
Manualfor WorldDays(distributed by the IQSY Secretariat, 6 Cornwall Terrace,
London NW
1, Great Britain ), which contains all otherdetails of the arrangements for rapid data exchange as wellas the plan for solar and geophysical alerts and other as‑
pects of the World Days program arranged for IQSY by
IUWDS.
The publication and free distribution of this booklet has
been made possible financially by the Federationof
AstronomicalandGeophysicalS e
rv i c e s (FAGS)
which is the body of the International
Councilof
ScientificUnions(ICSU), that coordinates
the workof the Permanent Services of the different Scientific Union
in the field of Astronomy and Geophysics, of which IUWDJThough the material presented in this booklet has beenchecked several times, there, no doubt, have remained
inaccuracies and indistinctnesses.In order to remove theseshortcomings in a possible second edition, the user is in
vited to make any criticism known to the IUWDSSecre‑
tariat.
Utrecht, August1963 TheIUWDSSecretaries

J.V. Lincoln
L.D. de Feiter

2. AIMSAND

STRUCTURE

OF IUWDS.

1. Name.
The International Ursigram and World Days Service (IUWDS)
Scientific Radic
isa Permanent Service of the International
Union (URSI) in association with the International Astro‑
nomical Union (IAU) and the International Union of Geodes^
and Geophysics (IUGG). The IUWDS
adheres to the Federa‑tion
Services (FAGS). The
of Astronomical and Geophysical
IUWDS
is a combination (1962) of two former permanent
services, the International World Days Service and the URSI
Central Committee
on Ursigrams.

2. Terms

ofreference.

The
to the worlc
service aims to provide information rapidly
scientificcommunity
to assist in the planning, coordinationand conduct of scientific work in the relevant disciplines.
These aims will be achievedby thea. Advance
specification of Regular World Days, World
Geophysical Intervals and other periods of geophysical in‑terest.
in World Geo
which will be Dublished annuallv
sical Calendars.

b. Collection, coordination, interchange and distribution
by rapid means of selected current observations and infor‑
mation of immediatesignificance to geophysical and spaceresearch and the provision of suitable interchange synoptic
codes.
c. Specification on a current schedule, by a World Warnin
Agency, of Solar Activity
and Geophysical Alerts and oc‑
casionally Special World Intervals.
d. Preparation and publicationof periodic post‑facto Calen‑
dar Records of significant indicesand outstanding solar andgeophysical events.
e. Undertaking of similar activities in cooperation with theparticipating scientific Unions or other international scien‑tific bodies.

3 .Regional

structure.

3.1. In view of par. 2 b and 2 c there shall be Regional
Ursigram and World Days Services ineach of the Geograph‑ical Regions. At present (1962) there are four such regions:a. Europe and Africa
b .Western Hemispherec. Western
d. Eurasia

Pacific

3.2. In each Region communication
facilitiesare provided
by the respective National communications
services for thecollection and distribution of current observations and in‑formation. One of thecenters engaged in this work shallbe designated as the Regional Warning Center,throughwhich center the interchange of data between the regionsis accomplished. Other centers in thisregion may be called
Associate Regional Warning Centers.
3.3. One of the Regional 'arning Centersshall be desig‑
nated as the World Warning Aerencv which declares theworld‑wide alerts and special observing periods, with theactive cooperation of the other Regional Warning Centers3.4. In each Region there shall be a Regional Ursigram
and World Days Committee,
for which rules are given un‑
der par. 5.
4. Steering

Committee.

4.1. The IUWDS
shall be administereding Committee
consisting ofby an IUWDSSteer‑

a. One representative from each of the following scien‑tificUnions: URSI; IAU; IUGG.
b. One representative from each of the Regionalgram and World Days Committees.

Ursi‑

c. The IUWDS
tary.

Secre

d. TheSecretary and the IUWDSSecretary General of URSI

Deputy(ex.officio).

4.2. In addition the Steering Committee
shall have thepower to seek cooperation, by direct representation orotherwise, with other international bodies interested in thework of the service.
4.3. The Steering Committee
shall elect its Chairman
andappoint the two secretaries; the position of these officers
will be reviewed at the occasion of each General Assemblyof URSI.
4.4. The Steering Committee
shall be responsible for theworld‑wide and interregional aspects of the service, foroverall plans and guidance, and for the necessary central
publications.
4.5. The Steering Committee
Warning Agencv from amone^Centers.

shall designate the World
the existing Regional Warn]5. Regional

Committees.

5.1. Inasmuch
as IUWDS
is administered by URSI, theRegional Committees
are formed under the
auspices of therelevant URSI National Committees,
with the direct parti‑
cipation, if they desire, of National Committees of IAU
and IUGG.
5.2. The existing (1962) Regional Committees
on Ursigrams
are considered to be reconstituted as the nucleus of the Re‑
gional Ursigram and World Days Committees
without further
formality.
5.3. In addition the Regional Committees
shall have thepower to seek cooperation, by direct representation or other‑wise, with others in the region actively engaged in obtain‑
ing observational data, the communications
network, theRegional Warning Centers and the users.
5.4. The Regional Committees
are responsible for the ac‑tivitiesof the Service in their region, including the col‑lection of information from observatories and the coordi‑
nation and dissemination of summaries and other appropriate
information to the other regions through their Regional War‑ning Center, according to the plans set up by the IUWDSSteering Committee.
5.5. Each Regional Committee
shall designate the Regional
Warning Center for its region and recognize
any Associate
Regional Warning Center deemednecessary for the effective
conduct of the work.
5.6. Regional Committees
shal otherwise dispose of thelargest autonomy
for the conduct of their own affairs withthe provision that any modification of the interchange co‑des to be used and the attribution of indicator numbers ofstations remain matters for the IUWDS
exclusively.

Present Membership(and address)
Mr. A.H.
Chairman

Shapley.

of Steering

Committee

Representative Western Hemisphere
Regional Committee
CRPL, National Bureau of Standards
Boulder, Colorado, U.S.A.

Hr. R.I Smith‑Rose

RepresentativeEuropean Regional
Committee
High Winds
Tumblewood Road
Banstead, Surrey, England

Or H

RepresentativeWestern PacificRegional Committee
Director,Radio Research Labora‑
toriesKokubunji, P.O. Koganei‑shi
Tokyo, Japan

Mm

Or A

Uyeda

e R.A

Zevakina

P. Mit.ra

Dr. R. Michard

Representative Eurasian Regional
Committee
Institute of Terrestrial Magnetism,
Ionosphere and Radio Propagation(IZMIRAN)
Leninskii r‑p, P/O Vatutenki
Moscow, USSR

Representativeof URSI (proposedfor confirmation URSI General
Assembly Tokyo, September 1963)
National Physical Laboratory
HillsideRoad
New Delhi 12, India
Representative IAU
Observatoire de Paris
Meudon (Seine et Oise)FranceDr. M.

NicoletMr. L.D.

de Feiter

Representative IUGG
Service Du Rayonnement
3 Avenue Circulaire
Uccle, Belgium

IRM

Secretary IUWDS
Sterrewacht "Sonneborgh"
13, Servaas Bolwerk
Utrecht, The Netherlands

Miss J.V. Lincoln

Deputy Secretary IUWDSCRPL, National Bureau of Standards
Boulder. Colorado. U.S.A.

Colonel E. Herbays

Secretary General URSI
7, Place Emile Danco
Brussels 18 ,Belgium

3. ORGANIZATION

OF

THE

URSIGRAMSERVICE.

The flow of Solar and Geophysical dataischanneled through the Regional Warning summaries
Centerssociate Regional Warning Centers. These Centers and As‑
collect
the information from the observatories within their region,interchange this information,
at least once daily, with theother Regional Warning Centers, and distribute the data,
so obtained among the interested observatories and insti‑
tutions within their region. In addition some of these cen‑ters communicate
the information through radio broadcasts
No special communication
facilitiesare used in this work;
the most effective and economical means available areused and many organizations cooperate most generously inproviding such channels.
The following table illustratesthe flow of current datasummaries among the Regional Warning Centers. The time;
are IJT and are aDDroximate.

AGIWARN

1) via NERAAGIWARN
TOKYO 0800
MOSCOW 1600
DARMSTADT 1230
PARIS
NERA 1500

from

to

MOSCOW2) via AGIWARN

TOKYO

3)

PARIS

via PRAGUEDARMSTADTSolar and Geophysical stations may contact the appropriate
Regional Warning Center regarding arrangements for recei‑
ving by, telegram or mail, the Solar‑Geophysical data sum‑maries. In each Region there are also Regional Committees
for this work, and the national memberof this Committee
is often in a position to help with such arrangements.
On the basis of the current observation summaries whichflow through the Ursigram network, each Regional Warning
Center issues whatever messages are appropriate. Some ofthese are ADVANCEALERTSof really outstanding solar or
geophysical events and are given even wider distribution
within the region and are interchanged among the RWC's.
Once each day, the RWC
designated as the IUWDS
WorldWarning Agency, issues, when appropriate, a world‑wide
Alert, a GEOALERT,
which is given stillbroader distri‑bution through the cooperation of the WMO
meteorologicaltelecommunication
network. A detailed plan of the systemof alerts adopted for the IQSY has been described in theInstruction
Manualfor the World
Days
Pro‑
gram
.

4 REGIONALWARNINGCENTERSADDRESSES

The addresses and other information for the various RWC's
are given below to enable geophysical stations to establish
suitable communication
channels for receipt and trans‑mission of data.
1 , IUWDS

World

Warning

AgencyMail:
Telephone:
Cable and Radiogram:(Commercial)

Box

Telegraphic:(Commercial)NORTH
ATLANTIC RADIO WAR‑NING SERVICE WUX WASH DC

178,

Ft. Belvoir,

Virginia,U . S .A .

Washinton, D.C.
, 765‑6411 or 765‑8436
AGIWARNWASHINGTON

703‑339‑5771

TWX:

24386

Telex:

Government
Teletype:
Operating Organization:

In Charge:
General Supervisor:

Dutch Section 2.1.1
Ma il:

AGIWARN

BUSTANFT BELVOIR

2. Regional

Warning

2.1 Western

EuropeCenters

Radio Receiving Station NERA
Nederhorst den Berg
The Netherlands

Telegraph:

AGI NEDERHORSTDENBERG

Telex:

Amsterdam

12308

J.C. Dito (PTT Leidschendam)

Supervisory:

Immediate

VA

North Atlantic Radio Warning Service
CRPL, National Bureau of Standards
Box 178, Ft. Belvoir, Va.
U.S.A.
,(E.J. Wiewara, Engineer‑in‑Charge)
Kent D. Boggs
Head, World Warning Agency
Miss J .Virginia Lincoln, (CRPL,
Boulder Colo.)

Charge:Paris Section 2.1.2
Mail:

Telegraph:

H. VanLohuizen

Service des Ursigrammes et Jours
Mondiaux
Centre National d'Etudes des Tele‑
communications
196 rue de Paris
Bagneux (Seine), France
CNETAGIBAGNEUX

Telex:
Telephone:Supervisory:

25312

Immediate

Miss N. Lordel

Charge:ALesia 31‑17

R. Michard, (Observatoirede
Paris,Meudon (S‑et‑O)

Darmstadt
Mail:

SectionFTZ Arbeitsgemeinschaft

Ionosphaere

Rheinstrasse 110, 61 Darmstadt
Federal Republic of Germany
IONOSPHAEREDARMSTADTTelegraph:

Telex:
Telephone:

4‑189291

Supervisory:
Immediate

2.1.3

Charge:Darmstadt 83‑2350
2351
2352
2353
B. Beckmann
Asst.: A. Ochs
C. Richter

2.2. Eurasia
Mail:

Telegraph:
Telephone:Supervisory:
Immediate
Charge:Mail:

Telegrams:

Supervisory:
Immediate
Charge:Institute of Terrestrial Magnetism,
Ionosphere and Radio Propagation(IZMIRAN)
Leninskii r‑p, P/O Vatutenki

NIZMIRMOSCOW

B2‑19‑21, 6‑03‑50
Mme.
R.A. Zevakina
Mme.

L.N.

Liakhova

2.3 Western

Pacific

Radio

Research Laboratories

Kokubunji P.
Tokyo, Japan

DEMPA

O. Koganei‑shi,

KOKUBUNJI

H. Uveda

T. Takiguchi
2.4 Western Hemisphere

Mail:

IUWDS

World Warning Agency

National Bureau of Standards
Box 178, Ft. Belvoir, Virginia,
U.S.A.
NORTH
ATLANTIC
RADIO
WAR‑
NING SERVICE
WUX
WASH
DC

Telegraph:

AGIWARN

Cable:TWX:WASHINGTON

703‑339‑5771
24386

Telex:

Telephone:

Washington,
765‑8436

Supervisory:

Miss J. Virginia Lincoln, (CRPL,
Boulder, Colo.)

Immediate

Charge:D.C.,

765‑6411

orKent D. Boggs

Associate Regional
Centers

Warning

1 Australia
Mail:

Telegraph:
Telephone:Supervisory:

Immediate

Charge:Ionospheric Prediction Service
CommonwealthCentreElizabeth Street, Sydney ,N.S.W.
Australia
IPSO SYDNEY
20340
W.G. Baker
F.E. Cook
3.2 Alaska

Mail:

North Pacific Radio Warning
ServiceNational Bureau of Standards
Box 1119. Anchorage, Alaska

Telegraph:

BUSTANALASKAELEMENDORF

Telephone:Supervisory:

SKYLINE

3‑2211

Immediate

L.W.

Charge:

AFBMiss J. Virginia Lincoln, (CRPL,
Boulder,Colo.)
Hone

a

3.3

Mail:

Telegraph:

Telex:
Telephone:Supervisory:
Immediate
Charge:SwedenThe Royal Board of Swedish Tele‑
communications
Fack
Farsta 1 .SWPHpti

IQSYCENTRE

STOCKHOLM

1208 (radiogen sth)1734 (radiocentr stkm)
Stockholm 44‑97‑40
Sven Gejer
G. Malmeren

6. PRIORITY

LIST FOR DATAINTERCHANGE.

Priority I World‑wide
data normally available at each
RWC. (i.e. these categories of data are inter‑changed among the RWC's)
UFLAR, UFLAC‑ Solar Flares, optical importance 1 or greater
URANA,URANP‑
Solar Radio Noise at about 200 Mc/s; fluxand events.
URANT,
URANS‑
Solar Radio Spectra
URANE ‑
Solar Radio Noise at 3000 Mc/s; flux andeventsUSIDA,UDISE‑
Sudden Ionospheric Disturbance, importance
1 or greater, including SWF, SEA, SCNA.
SPA and ionospheric radio propagation dis‑turbance .
UABSB ‑
Other ionospheric absorption events, in‑cluding polar cap absorption.
UCORA ‑
East limb corona (only yellow line, 5694
X has priority I)
URALA,URALO‑ Locations of sources of enhanced solar
radio noise
UPLAC.. UPDIA ‑ Location and activity of active centersin the solar chromosphere.
ADALERT ‑Advisory copy of Advance Alert issued in
all regions; not normally distributed fur‑ther, except in the region of origin.
GEOALERT ‑The daily Warning Message containing
declarations of world‑wide Alerts, asissued by the World Warning Agency.
UMAGA ‑
Geomagnetic
K‑figures and storm infor‑
mation from one representative observator
per region.
UPATA ‑
Observing hours of optical solar flare pa‑
trols .
Priority II RWC

USSPO.USSPM

will normally have data from its own
region (i.e. these categories of data are notregularly interchanged among the RWC'si‑ SunsDot data.

UFOFA

RAYCO

Ionosphericcritical frequencies.

‑ Intensities of coronal line ‑emission,
cluding green line 5303 A‑ Cosmic
ray flux data
̲ Auroral observationsin‑NOTESNOTESNOTESNOTESNOTESNOTESB.I. Solar

OpticalObservations

1.1 Sunspots
Code lj USSPO
Code 2; USSPM
1. 2 Solar Flares
Code 1; UFLAR
Code 2; UFLAC
Code 3; UP ATA
1.3 Calcium Plages and Centers of Activity
Code 1; UPLAG
Code 2; UPDIA
1.4 Solar Corona
Code 1: UCORA

B.I.I SUNSPOTS
Code 1. USSPO. Content.
Relative sunspotnumber
General activity indices for disk and limb
Area, position, importance, stage of evolution and Brun‑ner type of spotgroups

3. Definitionofsymbols.

USSPO = key word, sunspots
JJ = Greenwich date of observation
T = time of observation in tenths of the Greenwich
II ‑ observatory indicator (see also listsin part C)

01 = Arcetri
04 = Herstmonceux
07 = Kodaikanal
09 = Mt. Wilson
11 = Ondrejov
13 = Tashkent
14 = Belgrade
15 = Ztlrich
16 = Kanzelh&he
17 = Schauinsland
18 = Wendelstein
20 = San Miguel

79 = Moscow
21 = Tortosa
80 = Irkutsk
29 = Locarno
81 = Kiew
30 = Arosa
31 = USNO
Washington 83 = Athens
86 = Voroshilow
37 = Dunsink‑Dublin
87 = Kislovodsk
46 = NERA
49 = Rome
89 = Aba stum ani
92 = Potsdam
51 = Mitaka
93 = Wroclaw
54 = Wellington
96 = Lvov
55 = Manila
97 = Ljubljana
59 = Baguio
99 = Bucharest
62 = Freiburg

aaa = relativesunspot number (R) and observing conditions
if observingconditionsare good 600 is added to R
if observingconditionsare fair 300 is added to R
if observingconditionsare poor R is leftunchangedb = general activityindex for the disk in a scale from
1 to 5; 1means small, 5 means great activity
c = general activityindex for the limb; same scale as
for bee = serialnumber of spot group, assigned by the reporting
observatoryon the basis of observationson precedingdays
fff = area of spot group in tens of millionthsof the solar
hemisphere
Q = Quadrant (heliographiccoordinates)in which the spotgroup is situated
1 = NE (north‑east) 4= NW (north‑west)
2 = SE (south‑east) 3= SW (south‑west)
XX = distanceto centralmeridian in degrees
YY= heliographiclatitudein degrees
1 = importance of spotgroup on a scale of 1 to 3, com‑bined with information on the stage of evolution

1 =
2 =
3 =
4 =
5 =
6 =
7 =
8 =
9 =
X =

importance 1 , increasing stage
importance 2, increasing stage
importance 3, increasing stage
importance 1, stable
importance 2, stable
importance 3, stable
importance 1, decreasing stage
importance 2, decreasing stage
importance 3, decreasing stage
no evaluation given

number of days group observed since
firstappearance on disk
1 = A
2 = B
3 = C

4 = D
5 = E
6 = F

kk = numberof spots counted

7 = G
8 = H
9 = I
in the groupNOTESSUNSPOTS

B.I.I
Code 2. USSPM
1. Content.

‑ Relative sunspot number‑ General activityindices for disk and limb
‑ Area, positionimportance, magnetic and Brunner typeof sunspotgroups,spotcount

3. Definition
USSPM

ol

symbols.

= key word, sunspots
and especially their magnetic
J J= Greenwich

type

date of observation

T = Hm** nf observation in tenths of the GreenwichdayII = observatory indicator (seealso lists in part C)
09 = Mt. Wilson 79 = Moscow 92 = Potsdam
aaa = relative sunspot number (R) and observing conditions
if observing conditions are good 600 is added to R
if observing conditions are fair 300 is added to R
if observing conditions are poor R is left unchangedb = general activity index for the disk in a scale from
1 to 5; 1 means small, 5 means great activity
c = general activity index for the limb; same
as for b

scale

ee = serial number of spotgroup, assigned by the report‑
ing observatory, on the basis of observations on
preceding days
ff = area of spot group in tens of millionths of thesolar hemisphereQ = quadrant (heliographic coordinates) in which the
spot group is situated
1 = NE (north‑east) 4= NW (north‑west)
2 = SE (south‑east) 3= SW (south‑west)XX= distance to central meridian in degrees

YY= heliographic latitude in degrees

g = importancemof spot group in a scale of 1 to 3

= magnetic classification of the spot group
1 = alpha 2 = beta 3 = beta/gamma
4
1 = A
2 = B
3 = C

kk number

4 = D
5 = E
6 = F

7 = G
8 = H
9 = I

of spots counted in the group= gammB.I. 2 SOLAR

FLARES

Code 1. UFLAR
1. Content.
‑ Position, importance and duration of solar flares
ported by a single observatory.

3. Definition
UFLAR

of

symbols.

= keyword, solar flares
JJ = Greenwich date of observation
U = quality of observation;
1 = poor, 2 = fair, 3 = good
II = observatory indicator (see also

08 Mc.Math
01 Arcetri
09 Mt.Wilson
03 Sydney
04 Herstmonceux 10 Meudon
11 Ondrejov
05 Huancayo
06 Kharkov
07 Kodaikanal 13
15 Tashkent
Zttrich16 Kanzelh'dhe
17 Schauinsland
18 Wendelstein
19 Stockholm
20 San Miquel
21 /Tortosa

22 Anacapri‑S
29 Locarno
30 Arosa
32 Sacramento
Peak
34 Climax
37 Dunsink
41 Honolulu
46 NERA47 Anacapri‑G

48 Nizamiah
80 Irkutsk
50 Tonanzintla 81 Kiew
51 Mitaka
83 Athens
53 Utrecht
86
88 Voroshilow
Alma‑Ata
54
57 Wellington
Ottawa89 Abastumani
59 Quezon City 91 Nanking
64 Uccle
96 Lvov
94 Capetown
78
Burbank
79 Moscow
99 Bucharest

Q = quadrant (heliographic co‑ordinates) in which theflare is observed
1 = NE (north‑east) 4= NW (north‑west)
2 = SE (south‑east) 3= SW (south‑west)
XX = distance to central meridian in degrees
YY = heliographic latitude in degrees
P = indicator that time which follows is:
1 = Beginning of flare, end of flare was observed
2 = Beginning of flare, end of flare not observed
3 = First observation of a flare in progress, end of
flare observed
4 = First observation of a flare in progress , end of
flare not observed
5 = Reserved for "R" (see below)
6 = Time of maximumof flare
7 = Time of secondary maximumof flare8 =9 = Nominal time of beginning of a subflare
HHmm=time in hours and minutes (UT); if no duration‑
importance group is given (see "R" below), theimportance of the flare is indicated by coding
HH as follows:
if importance 3, increase the hour by 60
if importance 2, increase the hour by 30
if importance 1 or 1‑, or if RDDDZ
given, insert actual hourgroup isR = alwavs 5; this is a special indicator to tell that

this group gives the duration and the more precise
importance of the flare.
duration or period of observation of the flare, de‑pending on whether the indicator P in previous
group is 1 or 2,3,4. If no good estimate of theduration can be given use DDD = 000
7 = importance
8 = importance
9 = importance

1 = importance 1
2 = importance 2
3 = importance 3

1 +
2 +
3 +

Note Is As many times (PHHmm)
as are significant maybe
given to describe a flare, in order of increasing value ofthe time indicator P. Also, a second (and third, etc.)
flare in the same region may be fully reported without
ambiguity without repeating the groups UFLARJJUII QXXYY

NOTES

B.I.2 SOLAR

FLARES

Code 2. UFLAB
1. C

onte

nt

‑ report on a flare, based upon observations of several ob
servatories, or revised flare data from one observatory

3. Definition
UFLAB

of

symbols.

= key word of code
giving correction to previously
sent UFLAR
message or
a composite report fromseveral observatories,

JJ = Greenwich date of observationa = number of observatories reporting the flare
II = observatory indicator, if. composite report, insert
XX (or slant line in teletype message) (see also

30 Arosa
01
13 Tashkent
03 Arcetri
Sydney15 Zurich
32 Sacramento
Peak
04 Herstmonceux 16 Kanzelh'dhe
05 Huancayo
17 Schauinsland 34 Climax
06 Kharkov
37 Dunsink
18
19 Wendelstein
Stockholm
07
Kodaikanal
41
Honolulu
08 McMath
46 NERA
20
San
Miguel21
Tortosa
09 Mt. Wilson
47 Anacapri ̲G
10 Meudon
22 Anacapri ‑S 48 Nizamiah
11 Ondrejov
29 Locarno
50 Tonanzintla

78 Bur bank
51 Mitaka
79 Moscow
53 Utrecht
80 Irkutsk
54 Wellington
81 Kiev
57 Ottawa
59 Quezon City 83 A tliens
86 Voroshilov
64 Uccle

88 Alma‑Ata
89 Abastumani
91 Nanking
96 Lvov
94 Capetown
99 Bucharest

Q= quadrant (heliographic coordinates) containing theflare (clockwise direction)
1= NE (north‑east)
2 SE (south‑east)
3‑ SW (south‑west)
4= NW (north‑west)
XX= distance to central meridian in degrees
YY= heliographic latitude, in degrees
b= importance, or revised importance
7= importance 1 4
importance 1
8" importance 2^
importance 2
importance 3 9‑ importance 3^
HHmm‑time, or revised time, ol beginning
minutes UTmnoun. anu

c= indicator of time of maximum
6‑ time of maximum
7=
time of secondary
maximumHHmm=time, or revised time, of maximum
minutes UT

in hours andB.I. 2 SOLAR
CodeFLARES

3. UPATA

1. Content.
‑ solar flare survey intervals for H a

3. Opfinitiorfsymbols.

UPATA= keyword, flare patrol hours.
JJ = Greenwich date of observation
U = overall quality of observations
1 = poor 2= fair 3= goodII = observatory indicator (see also lists

01 =
03 =
04 =
05 =
06 =
07 =
08 =

Arcetri
SydneyHerstmonceux
Huancayo
Kharkov
Kodaikanal
Mc.Math

09 =
10 =
11=
13 =
15 =
16 =
17 =
18 =

Mt. Wilson
MeudonOndrejov
Tashkent
ZUrichKanzelh&he
Schauinsland
Wendelstein

19 = Stockholm
20 = San Miguel
21 = Tortosa
22 = Anacapri ‑S
29 = Locarno
30 = Arosa53 = Utrecht
54 = Wellington
57 = Ottawa
64 = Uccle
78 = Burba iik
79 = Moscow

32 = Sacramento
34 = Climax
37 = Dunsink

Peak 80 = Irkutsk
81 = Kiev
83 = Athens
85 = Simeiz
41 = Honolulu
46 = NERA
86 = Voroshilow
47 = Anacapri ‑G
88 = Alma‑Ata
48 = Nizamiah
91 = Nanking
94 = Capetown
50 = Tonantzintla
51 = Mitaka
99 = Bucharest
aaa = UT of beginning of patrol period in hours and tenths ofhours
bb = UT of end of patrol period, in hours and tenths of hours,with tens
digit
suppressed.

B.I.3 CALCIUM
Code

PLAGESAND
ACTIVITYCENTERS

1. UPLAG

1. Content.
‑ Area, importance and intensityof calcium pages.

3. Definition
UPLAG

of

symbols= keyword, plages
JJ = Greenwich day of observation
T = time of observation in tenths of the Greenwich
II = station indicator (see also lists in part. C)
08 McMath
Hulbert 10
Meudondj

q = quality of observation in a scale from 1 to 5;
1 means very poor, 5 means excellent,d = number of days since last message from this station
xx = always xx (or slant bar in teletype messages)n = number of plages (three five‑digit groups each)on which information will follow.

eeef

serial number, assigned by observatory
importance of plage region
on a scale of 1 to 3
combined with informationon the stage of evolution.
1 importance
1 , increasingstage
2 = importance 2, increasing stage

9 = importance 3, decreasing stage
X ‑ no evaluation given
g ‑ age of the region
1 ‑ born on disk
2 ‑ born on invisible hemisphere, first disk transit
3 ‑‑ second disk transit
4 ‑ thirdetc.
9 ・‑eighth disk transit
X ‑‑‑no evaluation given

Q

quadrant (heliographic coordinates) containing theplage
1 ‑ NE (north‑east) 4‑ NW(north‑west)
2 ‑ SE (north‑east) 3‑ SW (south‑west)
XX ‑ distance to thecentral meridian in degrees
YY ‑ heliographic latitude in degrees
iii ‑‑ area in millionths of the solar disk, divided by 100
1 ‑ (faint)
2 ‑ 1.53‑2k check,

4 ^ 2.55‑3
6 ‑‑‑3.5

7 4
8 ‑‑‑‑
4.5
9 ‑ 5 (very bright)

units digit of sum of preceding 14 digits.

b i 3'calciumCodeplagesandactivity

centersof

2. UPDIA

1. Content.
‑ Disappearances of filaments, dark surges on the disk,
loop and surge prominences at the limb.
‑ Position, importance and time of occurence.

3. Definitionofsymbols.

UPDIA= key word, prominence activity or disappearancesof filaments.
J] = Greenwich date of observation
T = time of observation in tenths of the Greenwich
day
II = observatory indicator (see also listsin part C)
08 = Mc.Math
Hulbert 32 = Sacramento Peak
34 = Climax
10 = Meudon
64 = Uccle
11 = Ondrejov
quadrant (heliographic coordinates) in which
phenomenon
is observed
1 = NE (north‑east) 4= NW (north‑west)
2 = SE (south‑east) 3= SW (south‑west)
type of phenomenon
1 = disappearance of major filament between
morning observation and afternoon obser‑
vation2 = disappearance of major filament; 1 day in‑terval between disappearance and whenfilament was still visible
3 = disappearance of major filament; 2 days
interval between disappearance and whenfilament was still visible
5 =6 =7 = surge on disk (unsually dark)
8 = loop prominence at limb
9 = bright surge at limb
distance to central meridian in tens of degrees
heliographic latitude in degrees
importance (for disappearances importance of fila
ment before disappearance)
1 = slight 2= moderate 3= highhour and minutes UT of phenomenonfora = 1,
2 or 3, it is the time of first observation after
the disappearance; for a = 7, 8 or 9, it is thetime of beginning of the phenomenon.

B.I. 4 SOLAR
Code

CORONA

1. UCORA

1. Content.
‑ Intensity of coronal line emission as a function of helio‑graphic latitude.

3. Definitionofsymbols.

= key word, corona
JJ = Greenwich date of observation
T = time of observation in tenths of the Greenwich day
TT = nhsprvatnrv in dir.a tor(see also listsin Dart C}
32 = Sacramento Peak05 = Huancayo
34 = Climax
16 = KanzelhOhe
36 = Pic du Midi
18 = Wendelstein
87 = Kislovdsk
26 = Norikura
88 = Alma‑Ata
30 = Arosaa = line observed (see key word COLOR
below)
1 = green ( X 5303A) 3 = red (X 6702 A)
2 = red ( ＼ 6374A) 0 =yellow ( k 5694 A)
b = scattered light intensity (measure of observation
quality)
1 = weak ( < 30 millionths) or observation highquality
2 = moderate (30‑60 millionths) or observation
moderate quality
3 = strong ( > 60 millionths) or observation low
qualityqqq = quadrantsof limb for which values are given i]message
1 = NE (north‑east) 4= NW (north‑west)
2 = SE (south‑east) 3= SW (south‑west)‑ if all four quadrants insert 999; if fewer
than three quadrants, complete group with0's
c = latitude (divided by 10) of intensity reported indd
dd = intensity measured at latitude
indicated by c(millionths divided by ten)ee = intensity measured at next succeeding 5 ° posi‑tion angle ‑ proceeding N‑E‑S‑W‑(millionths
divided by ten) (see Note 1)

COLOR
CORPM

=

more than one line reported, wordchange of line being reported.

= optional key
word, CORonaE = description of measurements

signifies

Pic‑du‑MidioJ east limb (see

where "a11 signifiesthat those portions of this quadrant nottransmitted in message have been observed but the intensi‑
ties are less than threshold, or were measured but are with,out interest;"b" signifies those portions not sent have not been measu‑
red but reason to believe they are without interest;"c" signifiesthose portions not sent have been measured
and their significance is unknown.
0 = the two quadrants have been completely measured andall values have been reported. .
X = neither of the quadrants have been measured
W = description of measurementsof west limb (same as
described for "E" above)
HHH = UT hour of observation in tenths of Greenwich day.
The sky brightness will be indicated by adding to
the UT hours, 0, 30 or 60 according to the bril‑liance .
Notes ‑ 1. Always give observations in order of increasing
position angle, i.e. N‑E‑S‑W.
A group giving
intensities at equator and poles is usually neces‑sary to avoid ambiguity.
2. Usually enough measurements
will be given tooutline the intensity peaks and usually only for
East limb, green and yellow line.

NOTESNOTESNOTESNOTESNOTES

B.II. Solar

Radio

Observations

II. 1 Flux
measurements
Code 1; URANA
Code 2; URANP
Code 3; URANE

on discrete frequencies

11.2 Spectrographs
Observations
Code 1: URANT
Code 2; URANS
11.3 Interferometric Observations
Code 1; URALA
Code 2; URALO

B.II.l FLUXONMEASUREMENTSDISCRETEFREQUENCIES

Code 1. URANA
1. Content.
‑ Frequency, period of observation, median
flux, type ofoutstanding occurrence ,time of beginning, amplitude
and duration.

3. Definition
URANA

of

symbols= key word, RAdio

Noise

JJ = Greenwich date of observation
X = Nominal radio frequency of observation (precise
frequency depends upon observatory)
1 = less than 50 Mc/s 3 = 150 to 300 Mc/'s
2 =50 to 150 Mc/s 4= neighborhood of 500Mc/s
II = observatory indicator (also see listsin part C)

02 Cambridge
33 NBS Boulder 66 Lwiro
79 Moscow
09 College
34 Seattle
80 Irkutsk
11 Ondrejov
41 Maui
12 Jodrell Bank 46 NERA
84 Simferopol
85 Simeis
13 Gorki
51 Mitaka
20 Buenos Aires
86 Voroshilov
56 Paramaribo
24 Berlin H .Herz 58
87 Kislovodsk
Hollandia
89 Abastumani
26 Hiraiso
63 Kiel92 Potsdam
28 Nanc^ay
64 Humain
95 Krakow
aa = UT hour nearest beginning of period of obser‑
vations reported
bb = UT hour nearest ending of period of observations
reportedc = number of 5 digit groups following which refer
to observations between aabb
dd = median flux for whole period reported, in tenthsof quiet sun; if greater than 9.9 then01 = 10 to 19 times quiet sun
02 = 20 to 29 times quiet sun

09 = 90 to 99 times quiet sun
00 = 100 times quiet sun
e = variation in median flux in interval reported
0 = less than 10 per cent change in median flux
level from hour to hour
1 = 10 to 25 per cent change
2 = 26 to 55 cent change
3 = 56 to 100 per cent change
4 = over 100 per cent change
X = uncertain
1 ‑ burst classification
0 ‑ 0‑5 bursts per hourj ‑ 5 to 100 bursts per hour
2 ‑ 100 to 500 bursts per hour
3 = more than 500 per hour4 ‑ period of storm with several great bursts
g ‑= burst amplitude
0 ‑‑ no bursts
1 0
to 1 2 times median flux
2‑1
!2 to 1 times median flux
3 = 1 to 3 times median flux
4 = 3 to 5 times median flux
5 ‑ 6 to 9 times median flux
6 ‑ 10 to 19 times median flux
7 ‑ 20 to 29 times median flux
8 ‑ 30 to 39 times median flux
9 39
times median flux
h key
to type of outstanding phenomenon
1 rise in base level; temporary, less than
2 hours
2 ‑ series of minor bursts
3 groupof minor bursts
4 = minor: characteristic isolated burst (fewseconds)

HHmm

HHmm

6 ‑ noise storm in progress; jHHmm
encoded jXXXX
7 ‑ onset of noise storm
8 ‑ major
9 = major plus *= UT of beginning of phenomenonwill

j = burst amplitude as in "gM
UT end of phenomenon* For type 9 there

will be four time groups; begin andend for "first part" and begin and end for "plus part"use XXXX
for end of "plus" if unknown at time of

・3
B.II.l. FLUXONMEASUREMENTSDISCRETEFREQUENCIES

Code 2. URANP
1. Content.
‑ Information on outstanding occurrences in solar radio
emission type of occurrence, time of beginning, ampli‑
tude and duration.

3. Definition
UNRANP=ofsymbols

key word, solar RAdio

Noise code

̲P

JJ = Greenwich date of observation
X = Nominal radio frequency of observation (precise
frequency depends upon observatory)
1 = less than 50 Mc./s
2 = 50 to 150 Mc/'s
3 = 150 to 300 Mc/s
4 = neighborhood of 500 Mc s
II = observatory indicator (also see lists in part C)
02 Cambridge
09 College

11 Ondrejov
12 Jodrell Bank

13 Gorki
20 Buenos Aires

24 Berlin H.Herz
26 Hiraiso
28 Nancjay
33 NBS Boulder
34 Seattle
41 Maui
46 NERA51 Mitaka
56 Paramaribo
58 Hollandia
63 Kiel64 Humain
66 Lwiro
79 Moscow

80 Irkutsk
84 Simferopol
85 Simeis
86 Voroshilov
87 Kislovodsk
89 Abastumani
92 Potsdam
95 Krakow

UT hour nearest beginning ol period of obser‑
vations reported
UT hour nearest endingof period of observa‑
tions reported
number of five‑digit groups following whichrefer to observations between a abb
key to type of outstanding phenomenon
9 ‑ major plus burst (see Note 1)
8 ‑・major burst
7 =‑ onset of noise storm
6 ‑ noise storm in progress ; jHHmm
will beencoded jXXXX
4 = minor : characteristic isolated burst (fewseconds)
3 = group of minor bursts
2 = series of minor bursts
1 = rise in base level; temporary, less than 2
hours
UT of beginning of phenomenon
burst amplitude
1‑0‑1
2 times median flux
2 ‑ 1 2 ―1 times median flux
3 = 1‑3times median flux
4‑3‑5
times median flux
5=6‑9
times median flux
6 = 10 ‑ 19 times median flux
7 ‑ 20 ‑ 29 times median flux
8 = 30 ‑ 39 times median flux
9 = > 39 times median flux
UT of ending of phenomenon

For type 9 there will be four time groups; beginning and end for "first part" and beginningand end for "plus part"; use XXXX
for end of"plus part" if unknown
at time of message.

B.II1. FLUXMEASUREMENTS
ON DISCRETE
FREQUENCIES
Code 3. URANE
1. Content.
‑ Daily flux level and outstandingphenomena

3. Definition
URANE

of

symbols.

‑ key word, solar RAdio

Noise, code

E

JJ = Greenwich date of observ ation
X ‑ Nominal radio frequency of observation
5 = neighborhood of 1,500 Mc/s
6 = neighborhood of 3,000 Mc/s
7 ‑ neighborhood of 10,000 Mc s
II ‑ observatory indicator (see also listsin part C)
24 Berlin H.Herz 46 NERA
57 Ottawa ‑ Algonquiaa ‑ UT hour nearest beginning of period of observa‑
tions reported
bb = UT hour nearest ending of period of observations
reportedc = number of 5 digit groups following which
to observations between a abb

refer

ddd = flux level at hour given in eeunits: 10‑22 m‑^(c/s)‑^ee = nearest hour UT of flux level measurement

HHmm

f = key to burst phenomenon.
5 ‑ post‑burst decrease
0 = doubtful
6 ‑‑ complex
1 = simple 1
7 = fluctuations
2 = simple 2
8 ‑ group
3 = simple 3
9 = precursor
4 = post‑burst increase= hours and minutes UT of beginning of phe

g = key to intensity class
1 = 0‑7.5 flux units
2 ‑ 7.5‑75
3 = 75‑750
4 = 750‑7500
5 = 7500
HHmm= hours and minutes UT of end of phenomenon
Notes: 1 .Designation of simple bursts based upon regionof "intensity" versus "duration" diagram
Region 1 ‑ Intensity^ 7.5. flux units ‑Duration < 7.5 minutes
Region 2 ‑ Intensity > 7.5 flux units
Region 3 ‑ Duration^ 7.5 minutes
Simple 1 ‑ Burst in Region 1 ‑ may be impulsive
Simple 2 ‑ Burst in Region 2 ‑ Impulsive burst
Simple 3 ‑ Burst in Region 2 ‑ long enduring or
gradual rise and fall burst
2. Commencement
time of bursts.
‑ taken when enhancement
departs from dailylevel by receiver noise {■≫ 1 flux unit)‑ for impulsive bursts, this may be determined
generally within a time interval of one mi‑3. Great bursts ‑ these are very intense bursts which
are generally very complex‑ the fluctuations are comparable to averagebursts ‑ their intensity is greater than 1000
flux units.

NOTES

B. II . 2
SPECTROGRAPHICCodeOBSERVATIONS

1. URANT

1. Content.
‑ Outstanding phenomena,
type, time of beginning andend, relative intensity, frequency range showing the ac‑tivity;decametric frequencies range.

3. Definitions
URANT

of

symbols.

= key word, solar RAdio

Noise, code

T

JJ = Greenwich date of observationa = number of phenomena
reported
II = observatory indicator (also see lists in part C)
33 = HAO

Boulderb = type of spectral activity
2 = slow‑drift burst
3 = fast‑driftburst
4 = broad band continuum
5 = continuum associated with fast‑driftburst
storms
HHmm= UT hour and minutes of beginning of activity

HHmm

c = relative intensity on scale of 1, 2, 3,: except
that
7 = importance 1 +8 = importance 2 +9 = importance 3 += UT hour and minutes of end of activity
dd = lowest frequency of activity in Mc/s
ee = highest frequency of activity in Mc/s
f = units digit of sum of preceding 14 digits.

NOTES

B. II2. SPECTROGRAPHICCodeOBSERVATIONS

2. URANS

1. Content.
‑ Outstanding
spectral activity, im‑occurrences, type of
portance, time of beginning, polarization, time of end.
ing,
position and type of position measurement.

ition
key

of

symbols

word, solar RAdio

Noise, code

S

Greenwich date of observation
key to spectral type of activity
1 = type I storm
2 = type II (slow‑drift) burst
3 =burstsgroup of type III (fast‑drift)
4 =drift) bursts
storm
of
type
III
(fast
5 =
type III (fast‑drift]
compoundburst:of II (slow‑drift) burst
bursts followed
bygroupa type6 = unclassified activity
7 = type IV (broadband continuum) burst
8 =9 =observatorv indicator falso see listsin Dart CI

03 Sydney
31 Big Pine

HHmm

32 Ft.Davis
33 HAO Boulder
62 Freiburg

a = importance (see Note)
2 = large
3 = very large
9 = exceptional= hours and minutes UT of beginning of activity‑ if mm= 99 signifies activity inprogress when
firstobserved (at HHoo + 30 mins.)‑ if mm= 88 signifies starting time known tonearest hour only
p = sense and degree of polarization
0 = no polarization

HHmm

1 = less than 50 per cent left‑handed polarization
2 = less than 50 per cent right‑hand polarization
3 = more than 50 per cent left‑hand polarization
4 = more than 50 per cent right‑hand polarizatioi
9 = polarization not measured= hours and minutes UT of end of activity‑ if mm= 77 signifiescontinuing when last ob‑
served (at HHOO
i 30 min.)‑ if mm= 66 signifies starting time known tonearest hour only
cc = heliographic position angle measured eastwards
from the north of the projected solar axis inten‑degree steps.
00 = heliographic position angle in range 0 +5 degrees
01 = heliographic position angle in range 10 +5 degrees
02 = heliographic position angle in range 20 +5 degrees

35 = heliographic position angle in range 350+ 5 degrees

1 = strip‑scanning position in which case theposition given is that of the point along
the mid‑line of the source‑strip which is
closest to the ccnter of the disk
2 = spot‑scanning position, in which case thecenter of the source spot is given
ee = radial distance from the center of the disk intenths of the photospheric radius R
00 = radial distance in range 0.0 + 0.05 R0(i.e. center of disk)
01 = radial distance in range 0.1 + 0.05 R0
02 = radial distance in range 0.2 ‑ 0.05 RQ
10 = radial distance in range 1.00 + 0.05 Rq(i.e. optical limb)
11 ‑ radial distance in range 1.10 ± 0.05 RQ‑ Importance should be assessed on the basis ofintensity, duration and rarity. As a guide:"Large", "Very Large" and "Exceptional" shouldroughly correspond in frequency of occurrencewith flares of importance 2, 3 and 3^.

B.II.3
INTERFEROMETRICOBSERVATIONS

Code 1. URALA
1. Content.
‑ Position, maximum

intensity and flux of solar radio

3. Definition

symbols.

URALA

of

= key word, solar RAdio

noise Location, code

A

JJ = Greenwich date of observation
T = time of observation in tenths of the Greenwich
day
II = observatory indicator (also see lists in part C)
28 Narnjay 31

Stanford

Q = quadrant (heliographic co‑ordiantes) containing
the noise source
1 = NE (north‑east) 4= NW (north‑west)
2 = SE (south‑east) 3= SW (south‑west)
XX = distance to the central meridian, in degrees
YY = heliographic latitude, in degrees
aaa = max.intensity in tens of thousands of degrees Kelvibb = flux of region in 10 22 w/m2/cycle/second.

B.II.3
INTERFEROMETRICOBSERVATIONS

Code 2. URALO
1. Content.
‑ Importance3. Definition
URALO

and location of solar radio noise sourcesofsymbols.

= key word, solar RAdio

noise Location, code0

JJ = Greenwich date of observation
X = nominal radio frequency of observation (precise
frequency depends upon observatory
1 = 50Mc As
2 = 50‑150 Mc/s
3 = 150‑300 Mc/s
4 ‑ neighborhood of 500 Mc/s
5 = neighborhood of 1,500 Mc/s
6 = neighborhood of 3.000 Mc/s
7 = neighborhood of 10,000 Mc/s
8 ‑ neighborhood of 35,000 Mc/s
II = observatory indicator (see also listsin part C
28 = Nangay,

31= Stanford, 46= NERA,a ‑ importance on scale 0, 1, 2, 3 where 3 has thegreatest importance.
b ‑ angular location with respect to North‑South dia‑meter at meridian transit

1 = North, east
5 = Central, east
2 = South, east
6 = Central, west
3 = South, west
7 = ‑ ‑ ‑ , east
4 = North, west
8 = ‑ ‑ ‑ , west
distance to NS diameter at meridian transit,
percent of the solar optical radius (e.g. 075
75%, 125 = 125% of the radius).

NOTESNOTESNOTESNOTESNOTESNOTES

B.III. Ionospheric

Observation

III . 1 Critical frequencies
Code 1; UFOFA
Code 2; UFOFE
III . 2 Sudden Ionospheric Disturbances
Code 1; USIDA
Code 2; UDISE
III . 3 Cosmic Noise Absorption
Code 1: UABSB

B.III 1. CRITICALFREQUENCIES

Code 1. UFOFA
Code 2. UFOFE
1. Content.
‑ Critical frequencies of F2 region (foF2) as a function ofStandard Meridian time (if code UFOFA)
or Universal
time (if code UFOFE)‑ maximumand minimum
values of foF2 and hour of oc‑
currence‑ F‑min frequencies as a function of same times as given
for foF2

3. Definition
UFOFA
UFOFE

of symbols.

= key word, foF2 , code A (Standard Meridian time)= key word, foF2, code E (Universaltime)local date of beginning of 24‑hour period report‑
ed if UFOFA or Greenwich date of beginning of
24‑hour period reportedif UFOFE
time indicator for approximate time of beginningof 24‑hour period
0 =
1 =
2 =
3 =

0000
0300
0600
0900

4 = 1200
5 = 1500
6 = 1800
7 = 2100

II = observatory indicator (also see lists in part C)

71 = Lindau
30 = Kiruna
05 = Huancayo
31 = Ft. Monmouth 73 = Breisach
07 = Kodaikanal
74 = Rabat
32 = White Sands
08 = St .John's
33 = NBS Boulder 75 = Bangui
09 = College
76 = Kerguelen
34 = Barrow
13 = Gorki
77 = Poitiers
41 = Maui
17 = Uppsala
78 = Anchorage
42 = Thule
19 = Lycksele
20 = Narsarssuak 46 = Leidschendam 79 = Moscow
80 = Irkutsk
51 = Kokubunji
21 = Tortosa
82 = Terre Adelie
56 = Paramaribo
22 = Lulea
84 = Simferopol
57 = Ottawa
23 = Adak
88 = Alma‑Ata
25 = NBS Ft.Belvoir58 = Hollandia
93 = Juhlesruh
59 = Baguio
26 = Taipei
94 = Cape Town
66 = Lwiro
27 = Okinawa
97 = Budapest
29 = Tamanrasset 69 = Pruhonicef = even hour indicator,give data for 0000, 0600,
1200 and 1800, beginning with the appropriate
hour after the date

0 = 0000 hours
3 = 0600

6 = 1200
9 = 1800

ggg = value of foF2 (in tenths of Mc/s; report as 000
if symbols only are applicable)
h = descriptivelettersymbol (see Piggottand Rawer,
URSI Handbook of Ionogram interpretation
andreduction,1961, for fullinformation)
X = none (use slant bar in teletype messages]
1 = A, blanketing sporadicE
2 = B, complete absorption
3 = C, equipment trouble
4 = D, frequency higher than equipment
limit
5 = E, frequency lower than equipment
limit
6 = F, spread echoes
7 = L, (not used for foF2), foFl not dis‑cernible
8 = 1, interpolated value
9 = T, smoothed value
0 = any other
MAXMI= key word, indicating that followinggroups give
MAXimumand Minimum foF2 during 24‑hour
period reported

HH = nearesthour of maximum value
PPP = maximum value of foF2 in 24 hour period re‑ported, in tenths of Mc/s
HH = nearesthour of minimum value
qqq = minimum value of foF2 in 24‑hour period re‑ported, in tenths of Mc/s
EFMIN

= f‑ MEM data to follow

ii = f‑min in tenths of Mc/s for time of first"fggh"group above"fggh" group abovekk = f‑min in tenths of Mc/s
group above
11 = f‑min in tenths of Mc/s
group above

for time of third "fgggh
for time of fourth "fgggh

Notes: 1. In "iijjk kllxx"groups "99" will signify f‑min >9.9 Mc/s
2. If symbol to be used for f‑min, encode as fol‑lows:
XI = A X3
X2 = B X5

XX

= C '
= E

(The X's should be slant bars in teletypemessages)= always "XX" (or slant bars in teletypemessages).

B.III 2.
SUDDEN.
Code

IONOSPHERICDISTURBANCES

1. USIDA

1. Content.
‑ Type of phenomenon(SWF,SEA,SCNA,SPA,SES),of beginning, duration and importance.

3. Definition
USIDA

of

time

symbols.

= key word, Sudden

ionospheric Disturbance

JJ = Greenwich date of observation
X = number of phenomena
reported
II = observatory indicator (see also listsin part C)

03 = Sydney
05 = Huancayo
07 = Kodaikanal
08 = McMath.09
College
10 == Bagneux

26 = Hiraiso
27 = Okinawa
29 = Tamanrasset
31 = Troy
31 = Ft. Monmouth
32 = White Sands
33 = HAO Boulder
15=
Ktlhlungsborn
18 = Weissenau
19 = Stockholm
33 = NBS Boulder
22 = Enkfcping
23 = Adak
37 = Dunsink
24 = Berlin H.Herz 41 = Honolulu
25 = NBS Ft.Belvoir 46 = NERA

52 = Canberra
56 = Paramaribo
58 = Hollandia
69 = Pruhonice
71 = Lindau
72 = Darmstadt
73 =
75 =
76 =
77 =
78 =
79 =
82 =
93 =

Breisach
Bangui
KerguelenPoitiers
Anchorage
Moscow
Terre Ad ￡lie
Juhlesruh

type of phenomenon
1 = typicalS‑SWF (shortwave fade out: sudden
recovery)2 = slow S‑SWF (shortwave fade‑out:dropout
taking 5 to 15 min and gradu‑
al racovery)
3 = G‑SWF (.shortwave fade out : fade irregularin both dropout and recovery)
4 = SEA (sudden enhancement of atmospherics)
5 = SPA, positive(sudden phase anomaly)
6 = SCNA (sudden cosmic noise absorption)
7 = SES (sudden enhancement of signalat about
15 kc/s)
8 = SPA, negative (sudden phase anomaly)
9 = solar radio noise storm at 18 Mc/s ‑hours and minutes (UT) of beginning of phenome‑
nonof phenomenon
7 = importance 1 +0 = importance 1‑
8 = importance 2+
1 = importance 1
9 = importance 3 +2 = importance 2
3 = importance 3

duration of phenomenon
in minutes‑ if 99 : duration equal to or greater than 99
minutesreliability of time
5 = beginning of phenomenon
itself is not clear
6 = nominal time
7 = first observation
8 = beginning time less certain than 2 min.
9 = beginning time accurate to nearest 2 min.
or less
definiteness of phenomenonon recording
3 = reasonable
0 = questionable
4 = reasonably definite
1 = possible
5 = definite
2 = fair

B.III.2
SUDDENIONOSPHERICDISTURBANCES

Code 2. UDISE
1. Content.
‑ Type and strength of ionospheric disturbance on a radio
propagation circuit, frequency range affected, time andduration.

3. Definition
UDISE =

of symbols.

key word, ionosphericDisturbance.

JJ = Greenwich date of observation
X = always a "0"
II = observatoryindicator(see also listsin part C)
03 Sydney
46 NERA
22 EnkOping
72 Darmstadt
25 NBS Ft.Belvoir78 Anchorage
26 Hiraiso
79 Moscowtype of disturbancereported
89 == ionosphericabnormal absorptionstorm
0 = disturbancecause undetermined
strengthof disturbanceand circuitsinvolved
1 = weak disturbanceaffectingsome circuits
2 = weak disturbanceaffectingall circuits
3 = moderate disturbanceaffectingsome circuits

4 = moderate disturbanceaffectingall circuits
5 = strong disturbanceaffectingsome circuits
6 = strong disturbanceaffectingallcircuits
nominal frequency range most affected
0 = trafficfrequency < 1 Mc/s
1 = trafficfrequency between 1‑2 Mc/s
2 = trafficfrequency between 2‑4 Mc/s
3 = trafficfrequency between 4‑8 Mc/s
4 = trafficfrequency between 8‑16 Mc/s
5 = trafficfrequency > 16 Mc/s
UT hour of beginning combined with duration
00 to 23 = durationof 3 hours
30 to 53 = durationof 6 hours (hour + 30)
60 to 85 = durationof 9 or more hours (hour+60)

B.III.3 COSMIC

NOISE

ABSORPTION

Code 1: UABSB
1. Cont

ent.

‑ Ionospheric absorption measurement
by riometer technique(SCNA, aurora or cosmic ray associated phenomena).

3. Definition
UABSB =

of symbols.

key word, ionospheric ABSorption

JJ = Greenwich date of observation
X = number of phenomena reported
II = observatoryindicator(seealsolistsin partC)
08 Resolute Bay 30 Kiruna 78
Anchorage
09 College 42
Thule 31
Quebec19 Spitsbergen57 Churchill 32 Eights
a = type of phenomenon

HHram

1 = solar
SCNA flare(suddencosmic noise absorption‑
associated)
2 = Aurora ‑ associatedabsorption
3 = PC A (polar cap absorptionevent)
6 = noise storm of solar radio emission super‑
posed on absorption= hours and minutes UT of beginning of phenomebb = number of decibels of maximum absorptionbe‑
fore indicated by next HH
X = always an X (or slantline in teletypemessage)
HH = UT hour when the phenomenon reported(if also
the ending time of the event, increase the hourby 30)NOTESNOTESNOTESNOTESNOTES

B.IV. GeomagneticandAuroralactiviIV. 1 Geomagnetic activityindicesand events
Code 1; UMAGA
IV. 2 Auroral Observations
Code 1: UAURA

B. IV. 1
GEOMAGNETICAND

ACTIVITYSPECIAL
EVENTS

INDICES

Code 1. UMAGA
1. C ontent.
‑ Geomagnetic‑ Geomagnetic‑ Geomagnetic

A^ index
K‑mdices for the period reported
disturbances with time of occurrence

3. Definition
UMAGA

of symbols.

= key word; magnetic activy
JJ = Greenwich date of beginning of 24‑hour period
reported
T = time indicatorfor UT hour of beginning of
24‑hour period
0 = 00
1 = 03
2 = 06

3 = 094 = 12
5 = 15

6 = 18
7 = 21II = observatory indicator (see also listsin part C)

03 = Sydney
09 = College
04 = Abinger
11 = Prague
05 = Huancayo
21 = Tortosa
07 = Kodaikanal 24 = Wingst

25 = NBS Ft.Belvoir
26 = Kakioka
28 = Chambon‑la‑
ForSt

29 =
31 =
32 =
34 =
38 =
40 =

T am anr asset 42 = Thule
74 = Rabat
Fredericksburg 45 = Hurbanovo 75 = Bangui
Sitka
46 = Witteveen 77 = Garchy
Barrow
52 = Canberra 78 = Anchorage
79 = Moscow
Helwan57 = Ottawa
Gnangara
67 = Dourbes 82 = TerreAdelie

69 = Pruhonice 85 = Simeis
aa = A^‑index for Greenwich date JJ (hundreds digit
omitted).(Note this is not the 24‑hour period
reported,unless T is 0. If A, not available atobservatory,put XX or slantoar in teletypemessage)kkkkkkkk = K indicesfor the 24‑hour period reported
P = indicatortellingthe time reported in HHmm
is
1 = storm end 6= gradualstorm beginning
2 = bay (psc) 7= storm sudden commence‑
3 = typicalcrochet ment(sc)
8 = very marked storm sc
HHmm= UT hour and minute of phenomenon indicatedby P.

B.IV.2

AURORALOBSERVATIONS

Code 2. UAURA
1. Content.
‑ Occurence, principal forms, activity, brightness andcolour of aurorae as functions of time and place of ob
servations.
‑ Quality of observations and cloudiness.

3. Definition
UAURAof symbols.

= key word, AURoral observations
JJ = Greenwich date of message
a = type of message
1 = warning
2 = survey
II = observatoryindicator(also see listsin part09 = College
17 = Uppsala
19 = Lycksele
22
30 == Enk&ping
Kiruna31 = Ithaca
33 = Byrd
45 = Lomnicki Stitt
57 = Saskatoon
71 = Lindau
81 = Murmansk

Greenwich date of observations
UT hour of warning or of beginning of obser‑
vations
tens of minutes afterHH for warning or numberof five digit groups "efghi" to follow if survey
messagetype of aurora during the firsthour0 = no observation
1 = no aurora
2 = veil
3 = pulsatingpatches
4 = homogeneous bands in the north
5 = homogeneous bands near zenith
6 = homogeneous bands in the south
7 = forms with typical ray structure
8 = combination of bands and rays without pro‑nounced motion
9 = Combination bands and rays with rapid mo‑tion over a great part of the sky.
brightnessand colour of aurora during the firsthour
0 = no observation
1 = colour uncertain(becauseof other lights,
moonlight, dawn, etc.)
2 = faintyellowish green
3 = moderate M "4 = bright
5 = faintyellowish green with red
6 = moderate n """7 = bright "≫8 = faintred only
9 = bright"
quality of observationsand cloudinessduring thetwo hours covered by ef an hi
0 = cloudy
1 = occasional observationand semi‑cloudy
2 = " " andalmost clear
3 = " " andclear
4 = periodicalobservationand semi‑cloudy" andalmost r.lp^ar6 = periodical observation and
7 = continuous observation and
8 = " " and9 = " M andclear
semi‑cloudy
almostclear clear

h = type of aurora as in "e" above, during the sec‑
ond hour or "0" if warningi = brightness and colour of aurora as in "f" above
during the second hour or "0" if warning
BB = UT
CC = UT

date of end of observations
hour at endingof the 60 minutes
to by hi in the last "efghi" groupk = always a "9"referred

Notes 1. In the first "efghi11 group"ef " refers to time in‑terval HH to HH+1 and "hi" refers
to the timeinterval HH+1 to HH+2. In
the second "efghi"
group, "ef" refers to thetime interval HH+2 to
HH+3 and "hi" to the time interval HH+3 to
HH+4 and so on to the last "efghi" group.
2. If all "efghi"‑groups are alike it is enough tocode one of them flanked in by bbHHl and
BBCC9
3. Theobservershould be able to judge which in‑formation is most important for each one hourNOTESNOTES

B.V. Alert

Messages

V.l Advice from Regional
Code 1; ADV ―Warning

V.2 Alert messages for the IQSY
Code 1; ADALERT
Code 2: GEO ALERTCenters

B.V.I
ADVICEFROMREGIONAL
CENTERSWARNING

Code 1. ADV‑‑
1. Content.
‑ Notification of Geophysical Alerts or Suggested Retroin‑tervals‑ Type and importance3. Definitionofsymbols.

ADV ‑ ADViceaa = Regional Warning Center giving advice
AN = Anchorage MO= Moscow
BE = Belvoir (AGIWARN) NE= Nederhorstdenberg
BO '= Boulder PA= ParisDA = Darmstadt ST‑ Stockholm
KO = Kokubunji SY= Sydney
bbbbb = code word as defined below
ALADA= advise issue GEOALERTof same typeas the ADALERT
issued today in thisregion
ALNIL = advise no GEOALERTALBEG = advise begin GEOALERTof type men‑tioned in next group of message

ALCON
ALFIN
REPRE
RETRO

= advise continue GEOALERTof type inprogress‑ advise finish GEOALERTof type in pro‑gress
= we predict MAGSTORM
for the future
period given by "eeff/"= dates given in "eeff/ (month)" groups
suggested as possible RETROINTERVAI(type) = added word with ALBEG or RETRO
and signifies
type of GEOALERT
advised(MAGSTORM,MAGCALME,
SOLCALME,
SOL‑
ACTIVITY
OR COSMICEVENT)
ortype of RETROINTERVAL
advised (IONOMAG‑STORM,
INTERPLANET,QUIETSUN,MICRO‑PULSATION
or RIOMETER)(ddddd)= strength of opinion, when desired
FORTE= strong
PIANO = weak
(ee = date of start of period for REPRE or RETRO
ff = date of finish of period for REPRE or RETRO/) = always an X (or slant line in teletype message)
month) = if advice is RETRO
cated for complete
for RETROINTERVAL

the month should be indi‑clarity of dates suggested

JJ = UT date advice given
HH = UT hour advice given
g = always a "0".

B.V.2ALERTYEARSMESSAGES
OF
THE

FOR
QUIET

THE
SUN

Code 1. ADALERT
1. C

ontent.

‑ Notification of advance̲ Type and importance3. Definition

of

alert

symbols

IQSY :ADALERT:(a) :International Quiet Sun Years program
Advance Alert
place of origin
name of the Regional Warning Center, or ob‑(b) :servatory, issuing the advance alert. Examples:
MEUDON,KOKUBUNJI,
SIMEIS, etc.
type of alert
MAGSTORM,
MAGCALME,
SOFLARE,
SOL‑

(c) :

CALME,SOLACTIVITY,
or COSMIC
EVENT
Not STRATWARM.
timing information
1. if phenomenon
has already started the no‑minal time of start is given by a date‑time group of the form: JJHHmmZ,
where
JJ =
Greenwich date
HHmm
= hours and minutes UT
Z =conventional svmbol to indicate U

2. if phenomenon is in progress,indicate by theword EXISTS
3. if phenomenon is predicted,indicate by theword EXPECTED
elaboration
1. for MAGSTORM
one can add the words:
AURORAOBSERVED or AURORA
PROBABLE,
or COSRAY DECREASE,
if appropriate
2. for COSMIC EVENT one can add words: COSRAY
INCREASE, or POLCAP ABSORPTION
3. for SOLACTIVITY
one can add words: FLARESor EAST LIMB or GAMMASUNSPOT or RADIO
SPOT or NEW REGION BORN, if appropriate
time of issue
this time is indicated by the usual date‑time group
JJHHmmZ as in c.l.
Note: this group may be omitted if the time ofthe phenomenon is given in c.

B.V.2ALERTYEARSMESSAGES
OF THE

FOR
QUIET

THE
SUN

Code 2. GEOALERT
1. Content.
‑ Notificationof Geophysical Alert‑ Type and importance3. Definitionofsymbols

International Quiet Sun Years program
World‑wide Geophysical Alert
Date‑serial number, a 5‑digit group of theform JJnrm, where
JJ ‑Greenwich date of issue
nnn ‑ Serial number of GEOALERT
messagetype of alert
MAGSTORM,
MAGCALME,
SOLCALME,
SOL‑
ACTIVITY,COSMICEVENT,or STRATWARM
Not SOFLARE.
timing information
1 . if phenomenon
has already started the no‑minal time of start is given by a date‑time group of the form: JJHHmmZ,
JJ ‑Greenwich date
HHmm
hours and minutes UT
Z =conventional symbol to indicate UT

(d) :(e) :2. if phenomenon
is in progress,indicate by
the word EXISTS
3. if phenomenon
is predicted, indicate by
the word EXPECTED
elaboration
1 . for MAGSTORM
one can add words AURO‑RA OBSERVED,
or AURORAPROBABLE,or
COS RAY DECREASE,
if appropriate
2. for COSMIC
EVENT
one can add words
COSRAYINCREASE,
or POLCAP
ABSORP‑TION
3. for SOLACTIVITY
one can add words FLA‑RES, or EAST LIMB, or GAMMASUNSPOTor RADIO
SPOT, or NEW
REGIONBORN,
if appropriate
Geographical Region of initial detection andmovement
expected, used only in connection
with STRATWARM.

Note 1: an IQSY GEOALERT
message is transmitted each
day soon after 04.00 UT; when no Alert is issued
the message reads IQSY GEOALERTNIL.
Note 2: the retrospective intervals of various kinds are in‑dicated in a GEOALERT
message of the form:

For further details see the IQSY

Instruction Manual

No. 1.

NOTESNOTESNOTESNOTESNOTESB . VI . Specialized

NetworVI. 1 Radio PropagationIndices
Code 1; PROP A
Code 2j PQ‑ N‑
VI.2 Radio Propagation Forecasts
Code 1; PREVI
Code 2; ST‑
Code
Code 3;
4; MT‑
AD‑
VI. 3 Detailed Riometer Data
Code 1; SRIOD
Code 2j SRIOM
VI.4 Detailed IonosphericData
Code 1; ION ―VI.5 Detailed Cosmic Ray Data
Code 1; UCOSA
Code 2; UCOSB
Code 3; CORAJ
Code 4: RAYCO

B.VI.l. RADIO

PROPAGATION

INDICES

Code 1. PROPA
1. Content.
‑ Radio propagation indices for certain radio circuits,
tored at the observatory

3. Definitionofsymbols.

PROPA= key word, PROPAgation

JJ =
X =
II =

Greenwich datealways a "X"
observatory indicator
72 = Darmstadt

conditions

circuit monitored
1 = North America

day, approx. 10.30‑24.00
night: 00.00‑10.30
2 = South America day 07.30‑21.00
night: 21.00‑07.30
3 = Eastern Asia day 04.30‑15.00
4 = Canada
5 = India

night: 15.00‑04.30

propagation index refering to day‑time, in tenth;of degrees in a scale of 1 to 5, where
1 = very poor
2 = poor
3 = rather good
4 = aood
5 = very good

= propagation index refering to night‑time, accord‑
ing to the same scale as bb
For circuits between Germany
and countries in theEast, the day period begins with sunrise in Germany
and ends with sunset in the country of the corres‑
pondent. For circuits with countries in the West, theday period begins with sunrise in the country of thecorrespondent and ends with sunset in Germany.
B. Beckmaim;
About the definition of radio propa‑
gation conditions.
URSI, 1954, No. 84, Comm.
III.

NOTES

B.VI.l RADIO

PROPAGATION

INDICES

Code
Code 2.
3. PQ‑
N‑Q
1. Content.
‑ preliminary propagationqualityfigures‑ daily code 1, or weekly, code 2, reports

3. Definitionof symbols.

key for daily report
key for weekly reportcircuit,or combination of circuits
A = AtlanticcircuitsP= Pacificcircuits
Greenwich date of beginning 24 hour period,incode 2
Greenwich date of beginning of first24 hour pe‑riod, in code 3
preliminary qualityfiguresfor each of the periodsof the day, wherec refersto 1800‑2400 if a = A, 0300‑1100, if a = F
d refersto 0000‑0600 if a = A, 1100‑1900, if a = F
e refersto 0600‑1200 if a = A, 1900‑0300, if a = F
f refers to 1200‑1800 if a = A, is always a "0", iia = F
Scale of qualityfiguresis 1‑5check, units digit of sum of preceding 6 digitsfor
code 2check, units digit of sum of preceding 4 digitsfor

B.VI.2.
RADIO

PROPAGATIONFORECASTS

Code 1. PREVI
1. Content.
‑ daily
for the direction Ger‑
radio propagation forecast
many‑North America
2. General

3. Definition

form.

of

symbols= key word, "prevision"‑ Greenwich date of begin of the 24 hour period t<which the forecast refers=
for begin of day period
expected quality figure=
for end of day period
expected quality figure=
for begin of folowing
expected quality figurenight period=
for end of night period
expected
quality figurescale
1 to 9, whereof quality figures is from
1 = unusable and 9 = excelent: The
quality figures give deviations from normal
conditions, which are predicted in the monthly
forecasts.
!: As
day period is considered the period in whichususally the day frequencies can be used; asnight period is considered the period in whichusually the night frequencies are to be used.
figures are
5: Forevery forecast period two quality
given in order to indicate the expected develop‑
fU/4 niiniv*rr
fw A x/*＼r*^
nictnnni A/i

B.VI.2.
RADIO

PROPAGATIONFORECASTS

Code 2. ST‑
1. C ontent.

̲ Short tprm fnrprsit

3. Definitionofsymbols

Circuit, or combination
forecast is given
A = Atlantic P.
of circuits for which the= Pacific

Greenwich date to which forecast
portion (number)of first forecast statement (letter and number)applies
forecast statements, consisting of a letter and anumber; letters are encoded as follows:
W = 3 U
= 5 N
= 7numbers
1 to 5give expectedperiods to which
cc : 0000‑0600,
dd : 0600‑1200,
ee : 1200‑1800,
ff : 1800‑2400,g =h =quality, in a scale fromthe forecasts apply are as follows
if a= A; 1900‑0300, if a = P
if a = A; 0300‑1100, if a = P
if a= A; 1100‑1900, if a = P
if a = A; if a = P , ff is al‑ways 00
always 0
check, units digit of sum of preceding 11 digits

Code 3. MT‑
1. Content.
‑ Mediumterm forecast

3. Definition
a =

JJ =
c =
d =
e =
f =
g =

of

symbols.

circuit or combination
casts are given
A = Atlantic P

of circuits for which fore‑= Pacific

Greenwich date for which first twelve hour fore‑
cast applies
forecast quality figure; 0000‑1200, if a = A
1800‑0600, if a = P
FOT forecast for c: 1 = low; 2 ‑ normal; 3 = highforecast quality figure; 1200‑2400, if a = A
0600‑1800, if a = P
FOT forecast for e: 1 = low; 2 = normal; 3 = highcheck, units digit of sum of preceding 6 digits

B.VI.2.
RADIO

PROPAGATIONFORECASTS

Code 4. AD‑
1. Content.
‑ forecastfor coming 7 day period

3. Definitionofsymbols

circuit, or combination of circuits
A = Atlantic P= Pacific
date of beginning of seven‑day period to which
forecast applies
date of ending of seven‑day period to which
forecast applies
forecast quality figures for each of the sevendays of the period
check, units digit of sum of preceding 11 digits
date of beginning of disturbed period
date of end of disturbed period
check, units digit of sum of preceding 4 digits

B.VI.3. DETAILEDRIOMETERDATA

Code 1. SRIOD
Symbolicform:

SRIOD DDXXX/aabb JJ /IIeeeeehhhhh hhhhh
FF/oo /

Key:

eeeee ggggg

kkkkk kkkkk mmmmm

pp/q q/rr/ ss/tt uuuuu

ggg ￡

mmmmm

uuuuu

wwv

wvwx

MMNNX

SRIOD

= Specializednetwork RIOmeter Daily data

DDXXX

= identifyinggroup for key‑punch operators

aa = lasttwo integersof the year
bb = number of the month
JJ = day of the month
II ‑ stationindicator
eeeee eeeee = hourly two‑digitvalues scaled in percent
of fullchart width for period 00‑04 UT
ggggg ggg§g = hourly two‑digit values scaled in percent
of fullchart width for period 05‑09 UT
hhhhh hhhhh = hourly two‑digit values scaled in percent
of fullchart width for period 10‑14 UT
kkkkk kkkkk = hourly two‑digitvalues scaled in percent
of fullchart width for period 15‑19 UT
mmmmm
=
mmmmm

of

FF =

hourly two‑digit values scaled in percent
fullchart width for period 20‑23 UT
monitored frequency in Mc

oo = calibration point for 0 ma
chart widthin percent of full

pp = calibration point for 1 machart widthin percent of full

qq = calibration point for 2 ma in percent of full
chart width
it = calibration point for 3 machart widthin percent of fullss = calibration point for 4 ma in percent of full
chart widthtt = calibration point for 5 machart widthin percent of full

uuuuu

uuuuu

= check sum for each of the columns
in thearray formed by the data following DDXXX

vvvw

vvv

= check sum for each of the rows in thearray formed by the data following DDXXX
w = checksum of uuuuu

x = check sumof vvvw

uuuuu
vvv

MM

= daily maximum
chart widthscaled in percent of fullNN= daily minimum
chart widthscaled in percent of fullX = checksum of MMNNS amplemessage

SRIOD

DDXXX

/6103 05//4 54545

75759

58585

86467 73798 37381 87767

37877

72676

259/2 30/00 /20/4 1/61/

81102

60754

18266 96267 69055 88534

B.VI.3. DETAILEDCodeRIOMETER

2: SRIOM

Symbolic

form:

SRIOM

EVTXX

/aabb

/TMAX

/TEND

dddee /AAFF

uuuuu wwv
Key:

DATA

vvwx

JJ/II /TSTA

/

SRIOM

= Specialized network RIOMeter

event report

EVTXX= identifying group for key‑punch

operators

aa = last two integers of the year
bb = numberof the month

JJ = date
II = station indicator
TSTA=

time of start of event in UT

TMAX= time of maximum

TEND= time of end of event in UTof event in UT

ddd = maximum
absorption during event intenths of db
ee = numberof peaks during event

A A = antenna identification
ff = frequency monitoreduuuuu = checksum forarray formed
EVTXX

in Mc

each column
in theby the data followingwvvv

vv = check sum for each row in the array
formed by the data following EVTXX
w = check sum of uuuuu
x = check sum of wvw

P 6

8

SRIOM

EVTXX

/2032 /2347
13276 3466

w

/6302
04207

12/19

/1740

/1030

18557

B.VI.4.
All

DETAILED

PurposeThis code
Code

Ionospheric

bbbbb

DATA

Code

is usedfor bothweeklyword:

ION

for ionosphere

Symbolic
IONaaaa

IONOSPHERIC

=

=

form:
bbbbb
ccdee

and

fgggh

station indicator
PO ‑ Pole Station
LA ‑ Little America
EL ‑ Ellsworth
KX ‑ Wilkes
BD ‑ Byrd

ionospheric
chars
FOFTO
‑ foF2FOFON‑ foFl
FOEEE
‑ foE
FOESS
‑
foEs
EFBES
‑
fbEs
MUFTO‑
MUFON‑

M
M

monthlymessages.

ijjjk (plus
additionalgroups like fgggh ijjjl

AR ‑ Cape
Adare
AN ‑ Anchorage
BE ‑ Belvoir
AD‑ Adaketc.

istic reported:
HIFTO‑ h'F2
HIFFF
‑ h'F
HIEEE
‑ h'E
HIESS
‑ h*EsEFMIN‑ f‑min(3000)F2(3000)F1

cc =beginning
date of observations reported (indi‑vidual hourly values)or= month;01 = Jan.
02 = Feb., etc. (monthly,
medianvalues)d =types of values
0 ‑ hourly values within a 24‑hour(Standard
MeridianTime)

period9 ‑ monthly median values (Standard Meridian
Time)
8 ‑
for a period ofvalues
at 6‑hourintervals
more than
24 hours
startingon date cc)
Note: In reportinga week's data, startwith 00 hours on Monday (Standard Meri‑dian Time)
7 ‑ values at 6‑hour intervals,from scheduled
ionograms taken on hour nearestto Local
Mean
Time.
Note: By arrangement, Universal Time may
be used insteadof Standard Meridian Time.
number of groups of data of characteristic
which follow
even hour indicator:(see Table 1, below)

TABLE
CodingI

Hour of Observation (f and i)

If coded in first If
Coded groupas hourcodedof pair, (i.e. "f") groupis hourin secondof pair, (i.e. Mi"
isvalue (report as 000 if symbol only
applicable ￨symbol (list A, below)

Numerical

LIST A
Coding for Letter Symbols (h and k

The following
numbers are used as the final
digit of each group to indicate
symbols which
explain doubtful or missing values.
Coded
X
1 6
2 7
3 8
4 9
5 0

as Symbol
none
A F
B L
C I
D T
E any

other

i =
(Table 1, above)
odd hour indicator;
jjj = valuek = symbol (see list A, above)
11111=
jjj values in precedingsum of all ggg andgroupswnTRS

B.VI.5.
DETAILEDCOSMICRAY

DATA

Code 1: UCOSA
1. C ontent.
‑ Outstandingoccurrences,times and percentage

3. Definition
UCOSA

of symbols.

= key word, COSmic

ray data, code A

J J= Greenwich date of observationa = type of apparatus
0 = neutron monitor (IGY‑type)
1 = high counting rate neutron monitor(IQSY‑type)
2 = meson monitor (IGY‑type)
3 = meson monitor (IQSY‑type)
4 = telescope,no shielding
5 = telescope,shielded
6 = inclinedtelescope,directed N
7 = inclinedtelescope,directed S
8 = inclined telescope,directed E
9 = inclined telescope,directed W
II = observatoryindicator(alsosee listsin part

51 =20 = Buenos Aires
57 =26 = Norikura
63 =30 = Kiruna
71 =34 = Climax
72 =36 = Pic‑du‑Midi
45 = Lomnicki Stitt 81 =Tokyo
Deep River
Kiel
LindauZugspitze
Tiksi Bayb = type of outstanding event
0 = slow decrease
1 = sudden decrease
2 = after effect of decrease
3 =4 = slow increase
5 = sudden increase
6 = after effect of increase
7 = daily variation of large amplitude
8 = daily variation of anomalous phase
HHmm= hour and minutes UT of beginning of event
ccc = maximum
deviation from pre‑event level inunits of 0.1%
dd = rise time of event (or decline) in minutes
X = always an "X" (or slant bar in teletype mes‑
sage)
HHmm
= hour and minutes UT of end of event

B.IV.5.
DETAILED
Code 2: UCOSBCOSMIC

RAY

DATA

*)

1. Content.
‑ Special events, detected by particle and radiation detectors carried by stratospheric balloons

3. Definitionof symbols.

UCOSB= key word, Cosmic Ray Jballoonobservations
JJ = Greenwich date of observation
M = type of detector flown
1 = Standard SPARMO detector
2 = Scintillation
counter
3 = Cerenkor counter
II = 01
Observatory(see also
listsin part C)= Bolognaindicator30= Kiruna
10 = Meudon 71= Lindau*) Thiscode is especiallyused by the European Solar
Particlesand Radiation Monitoring Organization(SPA]A = type of alert
1 = Geomagnetic disturbance
2 = type II absorption
3 = type III absorption (PCA)
4 = important activity center with intense 3 cm
emission on solar disk
HHmm
= time of launchingif launching took place on JJ‑1 : add 30 to HH
if launching took place on JJ‑2 : add 60 to HH.
T = type of event
7 = X‑ray increase 8 = proton increase
9 = J‑ray increase
HHmm= time of beginning of event
I = intensity of event
1 = smaller than 10% of normal, or background2 = between 10 and 50% "3 ̲m5Q.. 100M ≫. , .. .. u
4 = "
100
" 500" " " " " "
5 = "
500
"1000" " " " " "
6 = "
1000
"5000" " " " " "
7 = "
5000
"10000"" " " " "8 = larger than 10000"
"
≫ "
HHmm
= time of maximum
intensity
DDD= duration of the event in tenths of an hourdd = interval of reception of telemetrv sicmals in hours.

B.VI.5.
DETAILED
Code

COSMICRAYDATAJJ allbcdef

gijkl

nosst

3: CORAJ

Symbolic

Form:
CORAJ

Key:
CORAJ

= COsmic

RAy

HHHw

data (Japan)

JJ = Greenwich date of observation (UT)a = apparatus
0 = Neutron Monitor
1 = Meson Monitor (10 cm Pb, + 45 °,
14,400 cm2)
2 = Counter telescope (no shielding, + 70 °,
14,400 cm2)
3 = Counter telescope (10 cm
14,400 cm2)

Pb, +

70 °,

4 = Counter telescope (10 cm Pb, + 20 ° x +70 °, 16,630 cm2)
5 = Inclined telescope directing North (10 cn
Pb, 30 ° + 15 °, 4, 190 cm2)
6 = Inclined telescope directing South (thesame as 5)
7 = Inclined telescope directing East (thesame as 5)
8 = Inclined telescope directing West (thesame as 5)
II = observatory indicator
26 = Cosmic Ray Observatory (I.P.C.R.),
Mt. Norikura, 2770 m above
sea level
51 = The Instituteof Physical and Chemical
Research, Tokyob = meanintensity for 0000‑0200

U.T.

Daily mean value is expressed by the figure
5, and the deviation for two hours' period

from the daily
follows:

mean

value

is expressedasThe scale unit of deviation
for the observa‑
tional data obtainedby apparatus"0" should
be doubled.
intensity for 0200‑0400
U.T.
c = meanintensity for 0400‑0600
U.T.
d = meanintensity for 0600‑0800
U.T.
e = mean= meanintensity for 0800‑1000
U.T.

(0.2%
for apparatus "0") corrected
for thebarometer
effect, 50 corresponds
to that of
September
1, 1961.
t = classification of unusual phenomena
0 = calm
1 = increase
2 = after‑effect of increase
3 = decrease
4 = after‑effect of decrease
5 = daily variation of large amplitude
6 = daily variation of anomalous
phase
If "t" is other than "1", HHHw
are omitted.
HHH= time of maximum
intensity in hours and tenths
vv = percentageof the increment. U.T

B.IV.5.
DETAILED
Code

COSMICRAY

DATA

4: RAYCO

1. C ontent.
‑ bi‑hourly flux values of cosmic

3. Definition
fCOofrays, daily variation

symbols.

= key word, Rayons

Cosmique

JJ = Greenwich date of first period for which flux
values are given
T = type of apparatus
1 = meson telescope, 130 x 130, without shielding
2 = meson telescope, 50 x 100, shielder with
10 cm of lead
7 = neutron monitor, Simpson type.
II = observatory indicator (seealso lists in part C)
10 = Meudon
36 = Pic du Midi 46 = Nera
HH

= hour indicator; deviationof flux from the normal
value following
under aaa refers to the interval
HH‑1, HH + 1 hours.
if the deviation is positive 30 isadded to thehour to obtain HH.
aaa = deviation of cosmic
ray flux from the "normal"
level in °/00.
b = sign of daily variation
7 = negative 8= 7.ero 9= Dositive

type of variationduring the day.
0 = normal daily variation
1 = beginning of a prebaisse
2 = prebaisse
3 = commencementof a Forbush decrease
4 = Forbush decrease
5 = recurrentactivity
average deviation from normal flux.

NOTES

Part C. Listsof stationindicators

Part D. Indexof mentioned codes

NOTESorder and codesindicators

List I. ‑ Observatories and indicators in number

Observatory

applicableIndicator Observatory

Country
UFLAR,USSPO,URANA,UFLAR,URANA,USSPO
UABSB,UFLAR,USIDA
UFLAR,UFOFA
UFLAR,UFOFA,UFLAR,USIDA
UFLAR,UFOFA,UABSBUFOFA,UFLAR,URANA,UFLAR,UFOFE,UFLAR,USIDA,UFOFA,

Codes

UPATA
UAURA
USSPO,UPATAUAURAUSSPO,UFOFE,UCORA,USIDA,UFOFE,

UPATA

UPATA

UPDIA

UFOFE
USSPO,UPATA
URANP,UCOSAUMAGA,USSPO, UFOFA
UPATA
UPATA
UDISE, UAURA,
ADV
UFOFE

USSPO,

UPATA

UPATA

URANP,UCORA,UFOFAUSSPO,URANA,UPATA
URANPUSSPO,
URANP

U

31

31

31

31

31

31

31

31

U

U

QuebecBig

Ft.

Fredericksburg

Troy

U

SwedenStanford

USNO

IthacaKiruna

30

Pine

U

Switzerland

Switzerland

Locarno

Arosa

30

29

Monmouth

Ft.

Algeria

FranceGermany

Tamanrasset

Nan<jay

ChambonOkinawa

Taipei

Hiraiso

Kakioka

Norikura

NBS

BerlinWingstAdak

Observatory

29

28

28

27

26

26

26

26

25

24

24

23

Lies

Washington

H.

U.

Belvoir

La

U.

Hertz

Germany

Foret

FranceR

CanadaU

U

Republic

Japan

Japan

Japan

.

.

.

.

.

.

Country

.

.

S.

S.

S

S

S

S

S

S

I

S

.

.

.

.

.

.

.

.

A.

A.

A

A

A

A

A

A

of

A

.

.

.

.

.

.

.

China

UABSB

URANS

USIDA

UMAGA

USIDA

URALA

USSPO

UAURA

UABSB

UFLAR

UFLAR

USIDA

URANA

UMAGA

USIDA

UFOFA

URANA

UMAGA

UCORA

UFOFE

USIDA

URANA

UMAGA

USIDA

Codes

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

URANP

UCOSA

URANP

URANP

UFOFA

URALO

UFOFA

UCORA

USSPO

UMAGA

UFOFA

UFOFE

ADV

UDISE

UFOFA

,

,

,

,

,

,

,

,

,

,

UFOFE

UPATA

UFOFE

UFOFE

,

UMAGA

URALA

USIDA

URANE

USSPO

UFOFA

UFOFE

,

,

,

,

,

UAURA

,

,

USIDA

UPATA

UFOFE

URALO

UDISE

UFOFA

,

,

UCOS
.

A

White

Sitka

HAO

NBS

Byrd

Climax

32

32

33

33

33

34

Sands

Netherlands

Netherlands

Netherlands

Honolulu

Maui

Thule

Lomnicki

Hurbanovo

Skalnate

NERA

Leidschendam

Witteveen

41

41

42

45

45

45

46

so

Gnangara

40

Pie

Stit

Helwan(Maui)

Dunsink

.

.
S

S

.

.

.

.

.

.

.

.

.

.

.

Czechoslovakia

Czechoslovakia

Czechoslovakia

Greenland

U

U

Australia

Egypt

Ireland

S

38.
France

U

37

S

S

Pic

.

.

36

U

U

S

S

S

S

S

S

Seattle

Midi

.

.

.

.

.

.

Antarctica

U

U

U

U

U

U

Barrow

Peak

34

du

Boulder

Boulder

Davis

34

.

Sacramento

Ft

32

Observatory Country

32

lies

A

A

A

A

A

A

A

A

A

A

A

.

.

.

.

.

.

.

.

.

.

.

UMAGA

UFOFA

USSPO

USIDA

UFLAR

USSPO

UMAGA

UCOSA

UABSB

URANA

UFLAR

UMAGA

UMAGA

UFLAR

UCORA

UMAGA

URANA

UPATA

UFLAR

UAURA

UFOFE

URANA

URANT

UMAGA

USIDA

URANS

UFLAR

Codes

,

URANP

URANS

UFOFE

UCOSA

UDISE

URANA

UPDIA

UAURA

UMAGA

URANP

USIDA

USIDA

UCOSA

UFOFA

URANP

UCORA

ADV

,

,

,

,

,

,

,

,

UCORA

UFOFA

,

,

,

,

,

,

,

,

,

,

.

,

,

,

,

UPDIA

,

URANE

ADV

URALO

UPATA

UFOFE

UFOFE

,

,

,

,

UPATA

UCOSA

UFOFA

UPATA

URALA

URANP

UFOFA

UFOFA

UPATA

,

,

,

,

,

,

,

UFOFE

UPDIA

USIDA

USSPO

,

,

USIDA

UFOFE

,

,

UMAGA

,

,

,

,

,

,

62
63

59
59

57
57
57
58

57

51
51
52
53
54
55
56

47
48
49
50
51

lica

Observatory
Country
Codes

Bangui

75

81

81

80

U.

Kiev

Murmansk

Irkutsk

Moscow

Burbank

78

79

Anchorage

GarchyPoitiers

78

77

77

Kerguelen

Rabat

74

76

Breisach73

Darmstadt

LindauPruhoniceDourbes

Lwiro

HumainUccle

Observatory

Zugspitze

a

72

72

71

69

67

66

64

64

lie

(Lockheed)

U.

U

U

U

U

FranceFranceAntarcticaalFrenchMoroccoGermany

Germany

Germany

Germany

.

.

.

.

S.

S.

AfricaCzechoslovakia

Belgium

Congo

Belgium

Belgium

Country

S

S

S

S

.

.

.

.

S.

A.

A

S

S

S

Equatori

.

.

.

.

R.

R

R

R

.

.

.

‑

UFLAR

UAURA

UFOFA

UFLAR

UFOFA

UDISE

UFLAR

UFLAR

UFOFA

USIDA

UMAGA

USIDA

USIDA

USIDA

UMAGA

USIDA

UCOSA

USIDA

UAURA

USIDA

USIDA

UMAGA

URANA

URANA

UFLAR

Codes

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

UFOFA

USSPO

UFOFE

URANA

UFOFE

UMAGA

URANA

UPATA

UFOFE

UDISE

UFOFA

UFOFA

UMAGA

UFOFA

UDISE

UFOFA

UMAGA

URANP

URANP

UPDIA

,

,

,

,

,

,

,

,

.

,

,

,

UFOFE

UFOFE

UFOFE

UFOFE

,

,

UFOFA

UPATA

UPATA

URANP

USSPO

URANP

UFOFA

UFOFE

UFOFA

UPATA

UABSB

,

ADV

,

,

UPATA

,

,

,

,

UCOSA

,

,

UMAGA

,

,

,

ADV

USSPM

USSPO

USIDA

UFOFE

UFOFE

UFOFE

,

,

,

,

,

Indicator Observatory Country

UPATA
UPATA

UFOFE
USSPO,UFOFE,UFOFA,URANP
UFLAR,UFOFA,UFLAR,URANA,USSPO,USSPOUFOFA,UFLAR,UCORA,URANP,UFOFEUCORA,URANP,USSPO,UPATA
URANP,USSPO,UFOFE,USIDAURANP,UFLAR,UFOFA,UPATA

URANP,UPATA
URANA,UMAGA,USSPO,URANA,UFLAR,URANA,UFOFA,USSPO

URANA,UMAGA,UFLAR,UPATA
URANA,UPLAG
UFOFA,UFLAR,UPATAUCOSAUSIDA,UFLAR,

Codes

UPATA

USSPM

UFLAR

UFOFE,USSPOUSSPO,UFOFED. Index
Key word Numberof mentioned
codes
of code Page
104
120
102
134
106
126
119
116
116
117
114
136
121
124
118
86
96
45
130
132
84
38
35
78
78
94
40
43
41
68
69
54
60
57
65
63
82
33
3n

NOTESNOTESNOTESNOTESNOTESNOTESNOTES

Drukkerij ,EJinkwijk" ― Utrecht