COMMON SCALE MAGNETOGRAMS
BY STATION DAY
8 FEBRUARY 1976

TTT TTT TTT TTT TT
LR ap Pry rn, |
MPD. 2. 028.80 Pye lane WN pUirwanycwt Ned pyr
E.LONO, = 338.30

NAS Ryeterpar len eat / rans ne
N.P.D. . 128 80 Pa ta a Nf ey

= 0
E.LONG. = 314.80

FC

pan
~~
= 031.20 means aaa
E.LONG. = 265.90

NAP.De

BA tne |
N.P.O. = 018.70

E.LONG. = 203.30

Wo
TI ow OMEN

NeP.D. =
E.LONO, = 129.00

on 2 10.80 [poner aa
E.LONG, = 080.50

Al AL ree
Has ee pee

oO U.T.

T 4 8 12
[SCALE IS 500 GAMMAS PER CM]
16



COMMON SCALE MAGNETOGRAMS
BY STATION DAY
29 FEBRUARY 1976

TT Ty TP ty] tr ty tT tT ty Tt

NPD. 25.90 maw, A
E,LONG. = 338-30

wu
we

BH ye

p————~-w,_|
N.P.O. = 018.70 roe nll
E.LONG. = 203.30
TI oom eh

meee

N.P.O. = 018.50 Van
E.LONG, = 129.00

DI om brennan}

N.P.D. = 0
E.LONG. = 080.50

Al ow
N«P.O. = 021.70
E.LONG. = 018.80

|_| 4

| | |_| 1 |_1
o U.T. 4 8 12
[SCALE IS 500 GAMMAS PER CM]

37


COMMGN SCALE MAGNETGGRAMS
BY STATION DAY
25 FEBRUARY 1976

a De ee ee

LR aw

NAP.D. =
E.LONG, = 338.30

N.P.D.
E.LONG,

NAS ow

FC ow oo
N.p.D. = 031.20 ns ewe
E.LONG. = 265.90

BW ow Can NN
N.P.D. : 016.70 Po ype

E-LONG,

DI ww

N.P.D. = 018.50 ———
E,LONG, = 080.50

Al wm
N-P.D. = 021.70
E.LONG. = 16.80

}oj jo fj to joj ft py ft yp tt ft tt

oO UAT.

4 8 12
SCALE IS 250 GAMMAS PER CM
33


wm AURORAL ELECTROJET MAG INDICES AE(7) wm AURORAL_ELECTROJE INDICES AE(7)
a

AU AU
a” TM
an LA Alt eye Wl my Ld ae
i anaal 4 ry Vi
San Sa
AL | AL
a =
76/02/13 | J el zeroesia_|
Ps ‘89
AE AE
fs ‘te
‘ ‘
i ‘ ‘
hon rf Md nm iy
" "
ty PA IN | t, 14 IA aa jv
Ao | bi] Ao
wy 7 ~ a

ee AURORAL ELECTROJET MAG INDICES AE(7) tne AURORAL ELECTROJET MAG INDICES AE(7)}
AU AU
= TM
an i, by Nit
: menue naa : ¥
i WT ‘ hy
AL AL
sv sm
nl e/0eis | = wm | __ 76702716 | a
so ‘se
AE AE
‘te ‘ie
‘ ‘
ns no
, Ly Lhd Rgeee HA ORUneamar, wey
Ao aol” ry
ea so | 1 1
wy AURORAL ELECTROJET MAG INDICES AE(7) we AURORAL ELECTROJET MAG INDICES AE(7)
AU AU
rd ad
* bee fl ener ay hfebeal Ly A bl]
" an a t MT ad ae
ie ! im Hie PTY Ne Ty
aL AL
ae a
wae] 76702717. | ML t6/0asi8
so we
AE AE
‘te ‘i
‘ ‘
ia i, “an A 4
H LA hey i hy In
st yt A ’ al
OLLI 1 eo

42



COMMON SCALE MAGNETOGRAMS
BY STATION DAY
2 FEBRUARY 1976

a a a a ee De a ee

TTT
LR oa WiWia¥ saan einen aN aaa

NeP.O. =
E.LONO. =

E.LONG,

Ss
nee : "e.20 Ve eo an

FC “Weal Laan yar
N.P.o. = 031.20 Ayn
E.LONG. = 265.90 a ea
BW cw) [aay rite apf f mare ea ey en
N.P.O. = 018.70
E,LONG, = 203.30
TI om Pl
NeP.0. = 018.50
E,LONG, = 129.00 NI
ch
—— 10
Ol ww Sea Wah deen eared 1s
N.P.D. = 016.50 haw LL
E,LONG. = 080.60
7
6
los

—4

ee | [nee art /Mnnv| —— 3
Al ww ey] fn penne
N.P.D. = 021.70
= 0
| |

E.LONG,

fj of |} | | | | ff

Oo UT.

T ‘ 8 12
SCALE IS 250 GAMMAS PER CM

10


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120 = "Gran

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5
5
pe

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5

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Iv Ig 10
Iv Iv Iv
Iv Ia Iv
SYN YT Iv
Iv Iv 10
SVN 87 SYN
uqloiId iv
Io Iv Iv
Iv Io 10
Iv Ia Iv
Iv Io Io
Iv Iv Iv
Iv Iv au
Iv Iv Iv
Iv Iv Ia
Iv Iv Ia
Ig To 10
Iv Ia Ia
Iv Iv Iv
Iv Ia Iv
Iv Iv Iv
Iv IG Ia
Iv Io I0
Iv Ig Iv
Iv Ia 10
Iv Ig Iv
Iv Iv I0
Iv Iv Iv
n2 £2 22

F°0S 69T- 8°60
o°o8 62T Oo°se
O°2t Sh- 0°90
O°2h T2- O°TT
0°90 4é- 0°84
SNOT iva
OIHavE9039
IL IG IL TL
IG I0 ME ME
Iv Ig IL m9
Ig Id MS ME
Io Ig 0 Ia
Io Id me HB
Ig Ig fa Ia
Id Id Ia 10
Ti MO TL IL
Iq Id Ia Id
Iv Ii Ik Th
Id IG I0 [4
Ivy m8 Me IO
ua oqo IL ue
Id I0 IG TL
Id IG Iv mg
Id IL I0 Id
Ta IG Me Ne
Ig Io Io Ia
It id I1 16
Iv IL Io [1
Iv Ii Ti Tb
Iv mG Me NS
Io Ig IG IG
Iv Id Tl se
Ia) IL IQ we
Id Ia I0 10
Iv IL w@ IL
Iv It IO TL
Te C2 6F eT

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Me
Me
Me

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ua
ua
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Mg
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Mg
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Mg
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N3773M 3dv9 = 3n
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DUNSSUVSSYYN =SUN ¥
UNIOANTI3Z = yr +
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NOILVOISTIIN3OI

Mg oma Me 94 ME
Ma oma Ma 94 ME
Ti IL 94 94 94
Ma MG MG 94 94
SVN SVN M& MG 94
MS MG Me MT yt
Me M@ Me Ma 94
IL M8 SYN ME Ma
IL m8 MB 94 94
m8 IL 94 M8 ME
Meo oM8 M8 O43 94
Me ome Me 94 MB
uloyt oul ome omg
M8 UT SUN Iv eT
m@ oma Me Me 94
Me Id MG MS MO
M8 oM@ O4 SYN BT
TL m@ M8 Ma Me
M8 IL IL ma 94
IL IL mB 94 94
ME M@ 94 94 ME
IL TL 94 MQ MO
94 04 94 94 94
Ma MG Ma Ma O4
Ma IL 94 94 94
ue oma@ ma Ma Mg
Il m@ ma 94 Me
IL M@ Ma Ma 94
Ma M9 Me Me O4

9t ST 4T St aT

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MS
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(suo1ze]s BuLUpewes worJ SUL} SLU 2B ALGeLLeAe JOU e2eq)
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94 94 94
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93 94 94
93°93 #94
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34°93 #04
Me oM8 SYN
M@ 94 SUN
M8 94 94
94 94 SUN
Ty 94 94
ma ome IG
M@ 045 YT
03 943 94
94 SUN 94
04 94 SYN
94 94 SVN
O34 SUN SUN
Oo4 04 SYN
94 94 SYN
94 94 SYN
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M@ SVN SUN
94 94 94
Me 93 SYN
ot 60 280

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48


COMMON SCALE MAGNETOGRAMS
BY STATION DAY
12 FEBRUARY 1976

LR
CR (10 soe ineen\ ane Le til
3:

E.LONG.

NAS cw

N-P.D. =
E-LONG, =

4:

i

FC x Wenn
N-P.D. = 031.20
E-LONG, = 265.90

BW ow
WaP.0. = 018.70 [Rute A Swsparnent Vel
2 2

E.LONG,

TI ow Jo
N.P.O. = 018.50 \
E.LONG, = 129.00

cn

j—— 10

DI ww ||»
re i ns [W/m nd yee wad Nf eer pe ON WHE 8
ol iC, = O80.

Al uw , nal
N.P.O. = 021.70 wy |e
E.LONG. = 018.80

Pope] jot pt tp pt | pp tt pet tp 0

0 UT. 16 20 24

‘ 8 12
SCALE IS 250 GAMMAS PER CM
20





Geomagnetic Data for February 1976
(AE(7)_Indices and Stacked Magnetograms )

by

J. H. Allen, C. C. Abston and L. D. Morris
NGSDC/EDS/NOAA
Boulder, Colorado 80302 USA

SECTION I. GENERAL DISCUSSION

1, Introduction

This is the second of a series of data reports in support of the International Magnetospheric
Study (IMS) and includes selected geomagnetic variation data for February 1976; the first (UAG-60)
gave similar data for January 1976. Included herein are analog records from seven auroral zone
stations, preliminary AE indices based on these data and various related tables, graphs and statis-
tics. It is expected that this series will continue on an increasingly timely schedule and with data
from additional stations which may be processed in time for publication.

2. Data Selection and Processing

The seven observatories supplying data for this report are shown in Figure 1. These are Leirvogur
(LR), Narssarssuaq (NAS), Fort Churchill (FC), Barrow (BW), Tixie Bay (TI), Dixon Island (DI), and
Abisko (AI). They were chosen from among the list of 12 observatories whose records are now routinely

Fig. 1. Provisional AE(7) network.

1


COMMGN SCALE MAGNETOGRAMS
BY STATION DAY
23° FEBRUARY 1976

a a a Da

LR

N.P.De
E-LONG,

=

25 90
38.30

wu
Be

NAS cH Jeep rf nt {
NeP.O. =
E,LONG. = 314.80

FCO om | ee
N.P.D. = 031.20 NS hao aot
2

E.LONG.

E.LONG.

BW |e nee iturte mene
N.P.D. TM 18.70 PN

TI ow ~~
N.P.D. = 018.50
E.LONG. = 129.00
cH
i—— 10
i+ 9
—j—. 8
DI ow [ame arainemmen adil aes
N.P.D. = 16.50 pen 7
E.LONG. = 080.50 6
|. 5
«4
||. 3
_|
Al ww
NeP.D. = 21.70 J} 2
E.LONG. = 18.80 | 4
[ft ff} } fp tt pt tp tp tf pt 0

o UT.

4 8 12
SCALE IS 250 GAMMAS PER CM

16 20 24

31 |


COMMON SCALE MAGNETGGRAMS
BY STATIGN DAY
9 FEBRUARY 1976

a a
Peer nnnall fe wy

LR ow
N.P.D.
E.LONO.

NAS a

N.P.O. = -026.90
E-LONG. = 314.80

FO ow

N.P.D. = 031.20
E.LONG, = 21

P33

hyo
ae
ris. oaeue
_
_.

TI om

N.P.D. = 018.50
E-LONG. = 1

OI ww

NeP.O. = 0}
E.LONG, = 080.50

7

poy
[J ot

|
| alo} +.

Lanner ner pi
ls
Al ww 2
N.P.D. = 021.70 T
E.LONO, = 018.80 1
| 1 4 | J 1 {| i i tt °

oO UAT.

‘ 8 12
SCALE IS 250 GAMMAS PER CM
7



COMMGN SCALE MAGNETOGRAMS
BY STATION DAY
15 FEBRUARY 1976

1 a a a se ee

TTT
LR om Lp p~—~_n___|

NeP.O.
E.LONO,

NAS «a Ln Lp tt yer rn
N.P.O. = 028.90 ae
E.LONO. = 314.80

FC wx

E.LONO,

NeP.D. = 091.20 Bn al Ate eee

BN  re.70 PN

E.LONG. = 203.30

TI om

N.P.O. =
E-LONG, = 129.00

E.LONG,

Ol wm py —- Tol 4
NAP.Ds 016.50
| AA pn |

Al cw |
N.P.0. = 021.70
E.LONG, = 018.60

Pf | ft ft ft tp ft pep ft | tp ft ft tt

oO UAT. 4

8 12
SCALE IS 250 GAMMAS PER CM
23


COMMON SCALE MAGNETOGRAMS
BY STATION DAY
11 FEBRUARY 1976

LR

TTT
po nr Weare irre Ap

1 |

TTT
H)
mip.o. = 028.90 | roe
E,LONG. = 3386.30
Neo egs.99 [| Writers JS
to, = genae raaad aan
FC Lpnemap nnd felt onl

NAP .De
E.LONG.

031.20
265.90

|
E:

|
|
=.

018.70
203.30

TIocw 4
N.P.O. = 018.50
E.LONG, = 129.00

cH

—— 10

~~
DI ww Ann] PC AN —|»
gas. s mee ee T.
|. 7
|}. 6

pW

Al ww [pee los
N.P.O. = 021.70 j—_|— 2
E.LONG, = 018.80
i—j— 1
|_| 1 | | | | | | {| | 4 | | | | | t 0
Oo UT. 4 8 16 20 24

12
SCALE 1S 250 GAMMAS PER CM
19


LR

NP .D.

E.LONG.

NAS

N.P.D.

E.LONG.

FC

N.P.D.

E.LONG.

BW

N.P.De

E.LONG,

TI

N.P.O.

E.LONG,

Al

N.P.De
E.LONG,

=

ee

031.20
265.90

016.50
080.50

021.70
018.80

25 90
38.30

COMMON SCALE MAGNETOGRAMS
BY STATION DAY

24 FEBRUARY

1976

T

T

TTT TTT

cn
|—— 10

!

oUt.

SCALE IS

4 8 12
250 GAMMAS PER CM

32


LR

N.P.D.

E-LONG.

NAS

NP .O.

E.LONG.

FC

NP AD.

E.LONG,

BW

NPD.

E.LONG,

TI

NeP.De

LONG.

DI

NP.D.

E.LONG,

Al

NsP De

EsLONO,

16.50
180.50

on
ge

COMMON SCALE MAGNETOGRAMS
BY STATION DAY

6 FEBRUARY

1976

emma eet
ch
\—— 10
|. —+ 9
[pater LA pA ratte en en fenner n |e
Pte
j—_}—. 6
—}—. §
jj. 4
a Nan pt 8
ij. 2
ij 1
Ltd Ltt Lit Litt °
o U.T. 4 8 12 16 20 24
SCALE IS 250 GAMMAS PER CM

14


UAG~48A

uAG-49

UAG-50

UAG-51

UAG-52

UAG-53

UAG-54

UAG-55

UAG-56

UAG-57

UAG-58

UAG-59

UAG-60

"Synoptic Observations of the Solar Corona during Carrington Rotations 1580-1596 (11 October 1971 - 15 January 1973)",
(Reissue with quality images] by R. A. Howard, M. J. Koomen, D. J. Michels, R. Tousey, C. R, Detwiler, D. E
Roberts, R. T. Seal and J. 0. Whitney, E. 0. Hulbert Center for Space Research, NRL, Washington, D. C. 20375
and R. T. and S. F. Hansen, C. J. Garcia and E. Yasukawa, High Altitude Observatory, NCAR, Boulder, Colorado
80303, February 1976, 200 pages, price $4.27.

"Catalog of Standard Geomagnetic Variation Data", prepared by Environmental Data Service, NOAA, Boulder, Colorado,
August 1975, 125 pages, price $1.85.

“High-Latitude Supplement to the URSI Handbook on Ionogram Interpretation and Reduction", by W. R. Piggott, British

Antarctic Survey, c/o SRC, Appleton Laboratory, Ditton Park, Slough, England, October 1975, 292 pages. price $4.00.

"Synoptic Maps of Solar Coronal Hole Boundaries Derived from He II 304A Spectroheliograms from the Manned Skylab
Missions", by J. D. Bohlin and D. M. Rubenstein, E. 0. Hulbert Center for Space Research, Naval Research Lab-
oratory, Washington, D. C. 20375 U.S.A., November 1975, 30 pages, price 54 cents.

“Experimental Comprehensive Solar Flare Indices for Certain Flares, 1970-1974", compiled by Helen W. Dodson and
E. Ruth Hedeman, McMath-Hulbert Observatory, The University of Michigan, 895 Lake Angelus Road North, Pontiac,
Michigan 48055 U.S.A., November 1975, 27 pages, price 60 cents.

“Description and Catalog of Ionospheric F-Region Data, Jicamarca Radar Observatory (November 1966 - Apri] 1969)", by
L. Clark and T. €. Van Zandt, Aeronomy Laboratory, NOAA, Boulder, Colorado 80302 and J. P. McClure, University
of Texas at Dallas, Dallas, Texas 75230, April 1976, 10 pages, price 33 cents.

"Catalog of Ionosphere Vertical Soundings Data", prepared by Environmental Data Service, NOAA, Boulder, Colorado
80302, April 1976, 130 pages, price $2.10.

“Equivalent Ionospheric Current Representations by a New Method, Illustrated for 8-9 November 1969 Magnetic Disturb-
ances", by Y. Kamide, Cooperative Institute for Research in Environmental Sciences, University of Colorado,
Boulder, Colorado 80302 and Geophysical Institute, University of Alaska, Fairbanks, Alaska 99701, H. W. Kroehl,
Data Studies Division, NOAA/EDS/NGSOC, Boulder, Colorado 80302, M. Kanamitsu, Advanced Study Program, National
Center for Atmospheric Research, Boulder, Colorado 80303, J. H. Allen, Data Studies Division, NOAA/EDS/NGSDC,
Boulder, Colorado 80302, and S.-I. Akasofu, Geophysical Institute, University of Alaska, Fairbanks, Alaska
99701, April 1976, 91 pages, price $1.60.

“Iso-intensity Contours of Ground Magnetic H Perturbations for the December 16-18, 1971 Geomagnetic Storm", by
Y. Kamide, Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder,
Colorado 80302 and Geophysical Institute, University of Alaska, Fairbanks, Alaska 99701 (currently Guest worker
at Data Studies Division, NOAA/EDS/NGSDC, Boulder, Colorado 80302), April 1976, 37 pages, price $1.39.

“Manual on Ionospheric Absorption Measurements", edited by K. Raver, Institut fiir Physikalische Neltraumforschung,
Freiburg, G.F.R., June 1976, 202 pages, price $4.27.

"ATS6 Radio Beacon Electron Content Measurements at Boulder, July 1974 - May 1975", by R. B. Fritz, Space Environment
Laboratory (currently with Wave Propagation Laboratory), NOAA, Boulder, Colorado 80302 USA, September 1976,
61 pages, price $1.04.

“Auroral Electrojet Magnetic Activity Indices AE(11) for 1974", by Joe Haskell Allen, Carl C. Abston and Leslie D.
Morris, National Geophysical and Solar-Terrestrial Data Center, Environmental Data Service, December 1976,
144 pages, price $2.16,

"Geomagnetic Data for January 1976 (AE(7) Indices and Stacked Magnetograms)" by J. H. Allen, C. A. Abston and
L. R. Morris, NGSDC/EDS/NOAA, July 1977, 57 pages, price $1.07.

USCOMI-NORA-ASHEVILLE, NO-9/77/8300



ae

Ppa

cor2t = -onore
oseto = “Odw

oergoz = “nor
deeto = oaW

@ omg

neo = Oe
@ 94


COMMON SCALE MAGNETOGRAMS
BY STATION DAY
21 FEBRUARY 1976

j
|
|
:
{:

BW om Ieee pV farrware Mran pe |

N.P.O. = 018.70 ed cw ae
E,LONG. = 203.30

= 018.50 eNO
= 128.00

—— 10

+ = 016.50 i—— 8
E,LONG. = 080.50

7

—| 6

—5

E,LONG, = 018.80

Al cm eens ad aan beieiaeeda daterae ae Noe |
N.P.D. = 021.70 —— 2 |

|_| | i | | | {| | 4 {|_| | 1 | 0

Oo UT. 4

8 12
SCALE IS 250 GAMMAS PER CM
29



COMMGN SCALE MAGNETOGRAMS
BY STATION DAY
18 FEBRUARY 1976

LR ow rr et yao ire ry
NAP.De 026.90

E.LONO. 338.30
NAS
NAS ty ane ra aoe eee liad nee ae
E.LONG. = 314.60
FC tx
sP.D. = Na
EsLono. = 268-80 mo yey
BW nn UA
NPD. 10.70 cenit ice aad
E-LONG. = 203.30
TI ow pen |
rl: a Pw eNO
cn
\——— 10
=e
ey } tos
OI cm ’
N.P.0. = 016.60 Tt
E.LONG. = 060.50 —— 6
i—— 5
I—— 4
* 3
Al om Ww ni
N.P.D. . 021.70 —-!
EsLONG. = 028.80 | | | t |_| | |_| | | | | |_| °

0 UT. 4 8

12
SCALE IS 250 GAMMAS PER CM
26


4. Acknowledgments

The authors of this IMS data report are on the staff of the National Geophysical and Solar-
Terrestrial Data Center (NGSDC) of the Environmental Data Service, National Oceanic and Atmospheric
Administration. WDC-A for Solar-Terrestrial Physics is colocated with NGSDC and shares the same
staff. We wish to recognize the efforts of those persons who operate the high-latitude magnetic
observatories and process the data from them. Recognition is also due the operators who patiently
curve-follow, check, and correct the data from which this report is compiled. Mr. W. I. Paddock
has carefully adopted the temporary baseline values and checked each stage of the digitization. We
hope that IMS participants who find this report useful or who can suggest improvements will correspond
with the authors.

5. REFERENCES

ALLEN, J. H. 1972 Auroral Electrojet Magnetic Activity Indices (AE) for 1970,
World Data Center A for Solar-ferrestrial Physics, Report UAG-22.

ALLEN, J. H., 1973 Auroral Electrojet Magnetic Activity Indices AE(11) for 1968,

c. Cc. ApsTON. and World Data Center A for Solar-Terrestrial Physics, Report UVAG-29.

L. D. MORRIS

ALLEN, J. H., 1974a Auroral Electrojet Magnetic Activity Indices AE(11) for 1969,

C. C. ABSTON, and World Data Center A for Solar-Terrestrial Physics, Report UAG-31.

L. D. MORRIS

ALLEN, J. H., 1974b Auroral Electrojet Magnetic Activity Indices AE(10) for 1967,

C. C. ABSTON, and World Data Center A for Solar-ferrestrial Physics, Report UAG-33.

L. D. MORRIS

ALLEN, J. H., 1974¢ Auroral Electrojet Magnetic Activity Indices AE(10) for 1966,

C. C. ABSTON, and World Data Center A for Solar-Terrestrial Phystes, Report UAG-37.

L. D. MORRIS

ALLEN, J. H., 1975a Auroral Electrojet Magnetic Activity Indices AE(11) for 1971,

C. C. ABSTON, and World Data Center A for Solar-Terrestrial Physics, Report VAG-39.

L. D. MORRIS

ALLEN, J. H., 1975b Auroral Electrojet Magnetic Activity Indices AE(11) for 1972,

C. C. ABSTON, and World Data Center A for Solar-Terrestrial Physics, Report UAG-45.

L. D. MORRIS

ALLEN, J. He, 1975¢ Auroral Electrojet Magnetic Activity Indices AE(11) for 1973,

C. C. ABSTON, and World Data Center A for Solar-Terrestrial Physics, Report UAG-47.

L. D. MORRIS

ALLEN, J. H., 1976 Auroral Electrojet Magnetic Activity Indices AE(11) for 1974,

C. C. ABSTON, and World Data Center A for Solar-Terrestrial Physics, Report VAG-59.

L. D. MORRIS

ALLEN, J. H. and 1975 Spatial and Temporal Distributions of Magnetic Effects as

H. W. KROEHL Derived from AE Indices, J. Geophys. Res. 80, 3667-3677.

DAVIS, T. N. and 1966 Auroral Electrojet Activity Index AE and Its Universal Time

M. SUGIURA Variations, J. Geophys. Res. 71, 785-801.



used by WOC-A for Solar-Terrestrial Physics in the derivation of Auroral Electrojet (AE) magnetic
activity indices. Reasons for their selection were (1) records from these sites are most promptly
available, (2) the sites are about evenly spaced in longitude, and (3) each location has demonstrated
its importance in the prior derivation of AE indices [Allen and Kroehl, 1975]. We hope that as
digital data processing from other observatories becomes more routine the network can be expanded,
and we can include data from College, Great Whale River, and Yellowknife to improve the station
distribution for these prompt indices.

Among the stations supplying data for this publication, only Fort Churchill and Barrow are
presently recording digital variations on-site. Both observatories use flux-gate instruments
supplemented by proton precession magnetometers and generate more or less routine absolute obser-
vations. Each component's amplitude is recorded every 10 s (20 s for BW) on magnetic tape, and analog
chart records are prepared as backup data. These high-time-resolution digital data are processed at
central facilities responsible for each observatory. Obvious errors (usually spikes) are corrected
and 1-min average values are computed. These preliminary data are sent on tape to WDC-A for Solar-
Terrestrial Physics where they are plotted and checked for stability of quiet-time levels (baseline
drift), presence of noise, and day-to-day continuity. As necessary, remaining spikes are removed,
and temporary" baselines are adopted to compensate for data problems that would affect derivation
of AE indices.

All the other observatories record magnetic variations photographically. Their magnetograms
are copied on 35 mm microfilm for transfer to WDC-A for Solar-Terrestrial Physics together with
calibration information. Here they are reproduced as almost original size magnetograms and digitized
at 1-min intervals using semiautomatic scaling equipment. Resulting digital tapes of component ampli-
tudes relative to baselines are passed through the same plotting and other quality control processes
as the original digital data described above.

After completion of quality control checks, all digital records are merged and replotted to common
time and amplitude scales. These are the monthly D, H, and Z component and daily H (or X) component
stacked plots included in this report. For most observatories intervals of missing data are apparent
in one or more components. These may arise from (1) loss of on-site digital data, (2) noise in original
digital data, (3) movement of traces off magnetograms during large excursions with no secondary trace
for that component, (4) lack of low-sensitivity storm magnetograms for disturbed periods, and (5) loss
of intermixing of analog traces during large, rapid field fluctuations. Every reasonable effort is
made at WDC-A for Solar-Terrestrial Physics to curve-follow disturbed traces. Fffects of data gaps
are seen in AE indices only when they occur at a critically located station and in the H component.
Often they are only apparent in the graphs of AU or AL.

3. Auroral Electrojet Magnetic Activity Indices

The AE index gives a global, quantitative measure of auroral zone magnetic activity resulting
from enhanced ionospheric currents associated with magnetospheric substorms. As defined by Davis
and Sugiura [1966], AE is the total range of H component deviations from quiet-time levels of the
field at a selected group of high-latitude magnetic observatories. Typically, a constant quiet-time
H value is determined for each observatory and subtracted from recorded H values. The resultant
deviations for all stations may be plotted to common time and amplitude scales and graphically super-
posed on a common reference or zero level. Then the amplitudes of the enclosing upper and lower
envelopes from moment-to-moment give the values of AU and AL, respectively. The range between them
is AE, i.e., AU-AL=AE. Their average is (AU+AL)/2=Ao (often indicated AO because many computers
lack the ability to produce lower case characters).

Complete discussions of AE and associated indices can be found in the two papers referenced above
and in the series of WDC-A for Solar-Terrestrial Physics Reports UAG-22, 29, 31, 33, 37, 39, 45, 47,
and 59 which cover the years 1966-1974. Each of these contains precautionary notes about the inherent
limitations of AE indices, even when derived from a relatively complete station network. Additional
notes on AE are given before the daily index graphs (page 39) and the figures based upon minute-to-
minute "frequency of index provision" by each station. Also given in this report are figures showing
showing the cumulative amplitude of H deviation for times when each station was providing AU and AL
‘indices (pages 53 and 55).


COMMON SCALE MAGNETGGRAMS
BY STATION DAY
7 FEBRUARY 1976

TTT TTT TTT TTT TTT TTT
LR ow Lye ep |
N.P.D. = 025.90
E.LONG, = 338.30
NAS cH ae
N.P.D. = 028.90 po 7
E.LONG. = 314.60 i"

FC mm po

a |
N.P.D. = 031.20 ama
E.LONG, = 265.80 Sw
|

BW ow Lm ee
N«P.O. = 018.70 jan A]
E,LONO, = 203.30

TI om NINN fren LA |
N.P.0. = 018.50 Ran
E,LONG. = 129.00 |
;
cn F
\—— 10
Ht»
DI cw | 6
N.P.D. = 016.50 NN erty RN
E-LONG, = 080.50 7 |
i 6
J} 5 7
ji—|— + |
——_ 3 |
Al wm eine ie ee
N.P.D. = 021.70 on eS
ELON, = 018.80 —j1
| Jt [14 | Jot | Jot oo | 0

oO _U.T. 16 20 24

T 4 a 12
(SCALE IS 500 GAMMAS PER CH] |
15



9Z6T AUWNuaad

oe-eIo = Oa
a) oMg

96820 = “Ord W
co) SUN

S20 = “ON
ayy


COMMON SCALE MAGNETOGRAMS
BY STATION DAY
13. FEBRUARY 1976

\i

TT TT T
LR ow of  TM
N.P.D. = 025.90
E.LONG. = 338.30
NAS « Lyte tla apn!
EILoNG, 2314.80

FC wx
N.P.D. = 081.20 {piers IE
E.LONG. = 265.90

Py SN

; | 4

tert Nr |
or

rt, ae ener
A

TI om
toe, 2 8 NA |
cn
—— 10
i. 9
FAV Wena ans ieemetcaabea tos
DI ow 7
NeP.D. = 016.50
E.LONO, = 080.50 i 6
+s
ee ee +
Al wn Po
NeP.D. = 021.70
E,LONG. = 016.80 | 2
—+— 1
Litt ttt} tp tt tp ft ft pt 0

0 U.T. 4 8

12
SCALE IS 250 GAMMAS PER CM
21



WORLD DATA CENTER A
for

Solar-Terrestrial Physics

REPORT UAG - 62

GEOMAGNETIC DATA FOR FEBRUARY 1976}
(AE (7) INDICES AND STACKED MAGNETOGRAMS)

September 1977

IMS DATA PUBLICATION No. 2



ww AURORAL ELECTROJET MAG INDICES AE(7)

My M
7602725 |
ven
AE
m9
noe
i LAN a
be
AO

AURORAL ELECTROJET MAG INDICES AE(7)

AU
oa 1 |
‘ a Ld
wy ttt bad eV tedlbel d4
" ve
i Wh
AL
| a
oa
AE
a
‘
Pe)
i i
& LMT alte
:
AO ii TM a
‘

AURORAL ELECTROJET MAG INDICES AE(7)

Kd
=
iE
ra
a

PUT sts

>
ae

yesoerea | TM i he

é
1T

——

44

AURORAL ELECTROJET MAG INDICES AE(7)

pd Ld bh}
Fy [ry i
|
ry esozv26_ |
hdres ela ae: Y|

AURORAL ELECTROJET MAG INDICES AE(7)

kl Leake rin

XE
=
EA
=
[a
=

“| rro27e8 |



2. Stacked Common Scale Magnetograms by Station Day (H Variations

The following stacked plots of H (or X) common scale magnetograms are reproduced from the digital
magnetic variations data obtained as described on page 2. Each station is identified by the abbrevia-
tion from Figure 1 and two coordinates: North Polar Distance (N.P.D.) and East Longitude (E. Long.).
The amplitude scale is given at lower left of each figure and corresponds to the centimeter scale at
Tower right. The amplitude scale is the same for each day except when the range of deviation would
cause a trace to exceed the space reserved for it. For such days (see 7-8 February 1976) the scale
is increased in uniform steps to assure nonoverlapping traces. To call attention to the scale change
(similar to switching to storm magnetograms), the new value is enclosed in a box.

The label "NGSDC (BOULDER) yy/mm/dd", at the bottom of first day plot, identifies the source
of the published data and the day on which the plots were prepared. The difference between data
recording date and its preparation date provides an indication of the time required to collect the
records, to initiate program development, and to process the data.



TTT

oersoz = “oNov:
Bireo = cosw

rte0 = "aw
94

820 > "a
(@) SUN


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Engineering, Cambridge, Massachusetts, March 1975, 25 pages, price 48 cents.

UAG-42 “Observations of Jupiter's Sporadic Radio Emission in the Range 7.6-80 “Hz 19 December 1971 through 21 March 1975",
by James W. Warwick, George A. Dulk, and Anthony C, Riddle, Department of Astro-Geophysics, University of
Colorado, Boulder, Colorado 80302, April 1975, 49 pages, price $1.15.

UAG-43 "Catalog of Observation Times of Ground-Based Skylab-Coordinated Solar Observing Programs", compiled by Helen E.
Coffey, World Data Center A for Solar-Terrestrial Physics, May 1975, 159 pages, price $3.00.

UAG-44 "Synoptic Maps of Solar 9.1 cm Microwave Emission from June 1962 to August 1973", by Werner Graf and Ronald N,
Bracewell, Radio Astronomy Institute, Stanford University, Stanford, California 94305, May 1975, 183 pages,
price $2.55.

UAG-45 “Auroral Electrojet Magnetic Activity Indices AE (11) for 1972", by doe Haskell Allen, Carl C. Abston and Leslie

Norris, National Geophysical and Solar-Terrestrial Data Center, Environmental ‘Data Service, May 1975,
144 pages, price $2.10.

UAG-46 "Interplanetary Magnetic Field Data 1963-1974", by Joseph H, King, National Space Science Data Center, NASA Goddard
Space Flight Center, Greenbelt, Maryland 20771, June 1975, 382 pages, price $2.95.

UAG-47 "Auroral Electrojet Magnetic Activity Indices AE (11) for 1973", by Joe Haskell Allen, Carl C, Abston and Leslie
D. Morris, National Geophysical and Solar-Terrestrial Data Center, Environmental Data Service, June 1975,

144 pages, price $2.10.



2.

Graph of AU, AL, AE, and AQ for Each Day of the Month

im AURORAL ELECTROJET MAG INDICES AE(7) tw
au au
” ”
+ Ul | Label ms
"
an Wal Ny babe bn
AL * AL
- 9
seo sm
om a esoevor_| > a
a se
AE Ac
we ‘a
: MLL dA be
nm "
OPM ‘,
A i Ao
bd 1 3 “
ww AURORAL_ELECTROJET MAG INDICES AE(7) vm
au AU
” ”
ty boha Iola 2 nda! ,
nh yy im) +] :
San HL er San
AL AL
a “0
1 0
am
sw
AE
‘
rn so

AURORAL ELECTROJET MAG INDICES AE(7)

ww a wt
AU
ea
ty Lal ‘i bral
f wT) A
oe 4
AL
aw
aL
‘an 76/02/05 =
n
a 1
AE AE
va wh
‘ ‘
a 1
, A.
se a . fe
AO AO
a oa

40

AURORAL ELECTROJET MAG INDICES AE(7)

blis

nad

| reroer02

AURORAL ELECTROJET MAG INDICES AE(7)

baal that)
ui et ei MM
i reso2r0a |

LPs}

AURORAL ELECTROJ G_INDICES AE(7)

Iospaboted Lode atl
a my] M77
revo2/06 |

MT deb Inde ale) i!

la

a



COMMON SCALE MAGNETGGRANS
BY STATION DAY
20 FEBRUARY 1976

ToT Ty) TT Ty tT TT yt Tt

TTT
LR ow
: fem \ oe
tas, stat [wy Pome pec

NAS ow
NeP.Ds
E.LONG,

FC a .

N.P.D. = 091.20 a an ae
E,LONO, = 265.90

BW ow anny

N.P.D. = 018.70

E.LONO. = 209.30

TI ow [a ne

N.P.D. = 018.50 yO]
E.LONG. = 129.00
JN amend

DI ~*ylsh la
NAPA.  ote.60 naan Aaaen atacieiactes hen a

E.LONG, = 080.50

Al wm byrne pow

NeP.0. = 021.70
E.LONO, = 016.80

[fof ft ft po ft ft fot | tt ft ft ft

Oo U.T.

4 6 12
SCALE IS 250 GAMMAS PER CM
28


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45


COMMON SCALE MAGNETOGRAMS
BY STATION DAY
19 FEBRUARY 1976

TT TT TTT] TTT TTT ot

LR om fry nee pee Wand
W.P.D. = 026.90 my ZT

E.LONG.

f
;

NAS cm lone Patna etme nach riea ah ye]
gers = gene PMY TS Aol

FC }—__~__| Pm al
N.P.D. = 031.20 wwe" RS

E.LONO,

BW tw Jonette
N.P.D. = 016.70
E.LONG. = 203.30

TI ow

nf]
ma, 2 ESS \ pnp

cn
|—— 10

DI ww a pp yr
N.P.D. Coores

E,LONG, =

Hon 2 et 2 Seatvaa"
PD. = : |.
E.LOND. = 018.80

Lt Lt Ltt Lt Ltt Ltt
OUT 4 8 12 16 20 26 °
[SCALE IS 500 GANMAS PER CM]

27


SECTION II, COMMON SCALE MAGNETOGRAMS

1, Stacked Common Scale Magnetograms For Whole Month (H, Z, and D Variations)

The three following graphs display condensed stacked plots of the H, Z, and D variations, respectively,
for seven stations minute-by-minute over the entire month. Component intensities are to the nearest 1 gamma,
and declination changes are to the nearest 0.1 minute of arc. Positive H, Z, and D changes are north, down,
and east, respectively. Amplitude scales given at the bottom of each figure correspond to the origina

centimeter scale reproduced at lower right. For each station the North Polar Distance (N.P.D.) and
East Longitude (E. Long.) are given.



LR

N.P.D.

E.LONG,

NAS

WP oD.

E-LONG.

FC

N.P.D.

E.LONG.

DI

NPD.

E.LONG,

AI

N.P.D.

E.LONG,

016.50
080.50

021.70
018.80

COMMGN SCALE MAGNETGGRAMS

BY STATION DAY
10 FEBRUARY 1976

TTT TT

T

—+— 5
| | -+
Inewaaciteeaann edema heii ani x” a)
jj — 2
J} 1
| | | | | | | | {| | | | |
Oo UAT. 4 8 12 16 20 24
SCALE IS 250 GAMMAS PER CM

18



001-4
o002- |]
oooe- |}

ooat-

oooe- |}

oo0%~ |

001-4
002-5

oooe- |

002 |]

0002- |]
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oooz-

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81 ST z 60 90 €0 v% 1% gt
1 ee TTT Meal? T

Nivel

pe
.

apes

08810 = *oNoTr3
L120 = “OrdN

090 = “ONT?
oso = vora-n

osreto = vara

os-e0z = *ONOT
Oreo = Ord'N


COMMON SCALE MAGNETOGRAMS
BY STATION DAY
27 FEBRUARY 1976

LR

N.P.D.
E.LONG.

125 90
138 30

wn
ge

rr ee a oe Ren DOC hate Ww

NAS cw

|

WePade = 020.90 [eter WW eo}
E.LONG. = 314.80
FC ao Lo |
. . ae Re ae ad
meats 2 gun nae eee
TI ow LN Am
tie ea yy)
ch
| —-—- 10
| 7°
DI wm ia | Nye |
N.P.D. = 016.50 |
E.LONO. = 080.50 i} 7 |
i+ 6 i
i 5
—
+. 3 {
AL wm yaw ed 2 |
N.P.O. = 021.70 —— }
E.LONG. = 016.80 toy |
Lj ot tf fo} fo fp tp te tp et oo) |

16 20 24

oO _U.T. 4 8 12
[SCALE IS 500 GAMMAS PER CH]

35



COMMGN SCALE MAGNETOGRAMS
BY STATION DAY
28 FEBRUARY 1976

MTT TT TTT PTT Ty To

bryenrrrnneninn «La parle Nf

TTT
LR ow in| a
N.P.D. = 028.90
E.LONO, = 398.30
NAS cH oe
N.P.0. = 026.90
ELON. = 314.80
FO
N.P.D. = 031.20 Lh pnemarerstin fone nen |
E,LONG. = 265.90 ON eo thon
BW ow
N-P.Q. = 018.70
E,LONO, = 203.30 Vikas
TI NRA SON Cea
N.P.O0. = 018.50 P\eor|
E,LONG. = 128.00

cH
|—— 10

DI te
cH) vo.s0 bra IN wefan na

N.P.O. = 0 8
E.LONG, = 060.50 —-
7
i 6
i—j— 5

} 4

emer Ne neler |
AI cw yoy NW pn, FE:
N.P.O. = 021.70 “T
{| | |

E.LONG. = 018.80

jet

0 U.T.

4 8 12
SCALE IS 250 GAMMAS PER CM
36


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UoryBUMOFUT [ROLISTIeIS



LR

NP .De

E.LONO,

NAS

NAP .D.

E-LONO.

FC

N.P.O.

E.LONO.

BW

N.P.D.

E.LONG,

TI

NP.D.

E.LONO,

DI

NP.O.

LONG,

Al

NP De

ELON,

21.70
18.60

ou
eg

COMMON SCALE MAGNETOGRAMS

BY STATION DAY
16 FEBRUARY 1976

TTT TTT TTT

| | |

{| | 4 |_| | | | |

|
)

oO U.T.

SCALE IS

4 8 12
250 GAMMAS PER CM
24



N(AL)

24

aa
vw

03

TT
24

eae
|

18

Frequency of 1-min AL provision by station for February 1976.

hnrn|
ae
. ” 4

IT
00 u.t. 03

0 3s = is os = 38 — 2s
irae mio eid as © iG



SECTION
1.
2.
3.
4.
5.
SECTION

1.
2.

SECTION

TABLE OF CONTENTS

I: GENERAL DISCUSSION

Introduction

Data Selection and Processing

Auroral Electrojet Magnetic Activity Indices
Acknowledgments

References

II: COMMON SCALE MAGNETOGRAMS

Stacked Common Scale Magnetograms for Whole Month (H, Z, and D Variations
Stacked Common Scale Magnetograms by Station Day (H Variations)

III: PRELIMINARY AE(7) INDICES, FEBRUARY 1976

Discussion of Graphs, Tables, and Statistical Information
Graphs of AU, AL, AE, and AO for Each Day of the Month
Tables of AE, AO, AU, and AL Indices

Tables of Observatories Supplying Hourly AU and AL
Statistical Information

)

Page

wore



AO

AURORAL ELECTROJET MAG INDICES AE(7)

Mer, *arata La
Mri |

“1 yeroeri9 |

Ve

AURORAL ELECTROJET MAG INDICES AE(7)

raid
EN2

“{ rero2rer_|

Zz
=
-_
S&S
tau
cs

AURORAL ELECTROJET MAG INDICES AE(7)

a

76/02/23 |

43

AURORAL ELECTROJET MAG INDICES AE(7)

pethuabhiurtanLan py Jn}
pa cam
i
|. rer02/20 | ia
Belt
bbl ial Yalan) bea
ae

AURORAL ELECTROJET MAG INDICES AE(7)

rai CS oraciman

“{ revoere2 | ba
ns a NAL JOA slots
a .

AURORAL ELECTROJET MAG INDICES AE(7)

Tero2s24_|



AURORAL ELECTROJ INDICES AE(7) *  AURORAL ELECTROJET MAG INDICES AE(7)

wo
AU AU
TM ” Not
4 een peta NAL 1 pleted het pM
Dia ai nA mei
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AL AL
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ro rf ag NACL I
ca + ! =
ww AURORAL ELECTROJET MAG INDICES AE(7) vw AURORAL ELECTROJET MAG INDICES AE(7)
AU AU
© ”
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vn AURORAL ELECTROJET MAG INDICES AE(7) wm AURORAL ELECTROJET MAG INDICES AE(7)
AU AU
TM co
*  botetelealeacts sath ny ss | ale bs
Hi Wield 1 H Wahine LAWN
Saw ban yee
AL AL
‘we “0
on rT revoas11_| = wl resoe/i2_ |
se ‘0
AE AE
‘ ww
t AL ‘
Sen hen
te hla Mi te Di weatuany
a r on + ‘a
Ao wy Ao
= z| 0

41



COMMGN SCALE MAGNETOGRAMS
BY STATIGN DAY
3. FEBRUARY 1976

NeP.O. =
E.LONO, =

TTT TTT
LR ow tale ced eemameeh anand memenen penal Gnas

NAS cw

= 028.90 er)
E.LONO. = 314.80

|
|
]

NAP .O.

yer)

FCO om Lan

NeP.D. =
E,LONG, = 265.90

BW cw Rs ane

ae
|

a. PW ep
TI ow wn a Pn
lan. 2 e8%b0 ave an
ch
|. 10
i 9
DI ow Her nnrtennnl Nn nape
N.P.D. = 016.50 Ml Le" envi cian -
E-LONG, = 080.50 i)
|| 6
—j— 5
= |
eT |) COE ZO 6 is
AI ww Lng pol WW |
N.P.D. = 021.70
E.LONG, = 18.80 i—|— 1
{ | | {| | 1 [| | | | | | {| || Lt | 6
oO UAT. 4 16 20 24

8 12
SCALE IS 250 GAMMAS PER CM
ll

|
i
|


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r| ‘3

eo bP

= °
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i=

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3
3 a

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5

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:

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4
‘

=
rk

rs

oerG02 = “ONOT-a
oureto = “orath


LR

N.P.O.
E-LONG.

NAS

N.P.De
E-LONG,

FC

NPD
E.LONG,

BW

NeP.O.
E,LONO,

TI

NP.De
E.LONG,

OI

N.P.D.
E.LONG,

Al

NeP.D.
E.LONG.

=

125 90
38 30

on
ge

016.50
080.50

(WH)
= 021.70
= 018.80

COMMON SCALE MAGNETGGRAMS
BY STATION DAY

5

FEBRUARY 1976

[|

PW
Wi

eine cal |
| ff

cH
— 10

|}_9

|_7

|_§

| 4

|_3

12

Oo UAT. 4 8

12
SCALE IS 250 GAMMAS PER CM

13

16


WORLD DATA CENTER A

for
Solar-Terrestrial Physics

REPORT UAG - 62

GEOMAGNETIC DATA FOR FEBRUARY 1976
(AE (7) INDICES AND STACKED MAGNETOGRAMS)

by

J. H. Allen, C. C. Abston, and L. D. Morris
National Geophysical and Solar-Terrestrial Data Center
Boulder, Colorado 80302 USA

September 1977

Published by World Data Center A for My
Solar-Terrestrial Physics, NOAA, Boulder, Colorado

and printed by BZ
U.S, DEPARTMENT OF COMMERCE

Ly SS
NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION iw \

ENVIRONMENTAL DATA SERVICE
Asheville, North Carolina, USA 28801

SUBSCRIPTION PRICE: $25.20 a year; $17.30 additional for foreign mailing; single copy price varies.*
Checks and money orders should be made payable to the Department of Commerce, NOAA/NGSDC,

Remittance and correspondence regarding subscriptions should be sent to the National Geophysical and
Solar—Terrestrial Data Center, NOAA, Boulder, CO 80302.

PRICE THIS ISSUE $1.11



COMMON SCALE MAGNETOGRAMS
BY STATION DAY
26 FEBRUARY 1976

Ls a a Wa es a a a a

LR ww ee oe ee aera (TN
N.P.D. 026.90

E.LONG. = 338.30

NAS cw

N.P.O. = 028.90
E.LONG. = 314.80

FC [| ~~
N.P.D. 2 ost.20 Aaa haan. a

E,LONO. = 265.90

018.70
203.30

TI oom “ ON |
N.P.O. = 018.50 |
E.LONG. = 129.00
ch
\—— 10
j—l9
DI ww Avan |e
N.P.O. = 016.50 rn)
E.LONG, = 080.50 eet
—<« |
i—}_ 5 |
j—|— 4 }
Al wm nL] tos
N.P.D. = 021.70
E,LONG. = 018.80 re
1
{| | | | | | | | 4 { | | 1 | {| °

Oo U.T.

4 8 12
SCALE IS 250 GAMMAS PER CM
34



COMMON SCALE MAGNETOGRANS
BY STATION DAY
14 FEBRUARY 1976

LRooow Penn rn rh fe nr |
N.P.0. = 025.90

E,LONG. = 338.30 a

NAS ap ee Oe ee |
N.P.O. = 028.90

E.LONG, = 314.80 a yaad mate

FC ao Vectra
N.P.O. = 031.20 naan, :
E,LONO. = 265.90

BW POM preetahn n
HP .0. 2D one.70 aa VIN
E.LONO. = 203.30

TI nS ea OE, BNO
L~A~——~L--—
N.P.O. = 019.50
E.LONG, = 129.00
cn
ap 10
i}
DI wm | putter nel 8
w.p.o. = o16.s0 PY or
E.LONG. = 060.50 1
— 6
ts
— }
AI am ae ee a
N.P.O. = 021.70 j' le
E,LONG, = 016.60
1
Ppp} ptt Pepe te tpt peppy ft yy | °
OUT. 16 20 26

4 8 12
SCALE IS 250 GAMMAS PER CM
22


WORLD DATA CENTER A
National Academy of Sciences
2101 Constitution Avenue, N.W.

Washington, D. C., U.S.A., 20418

World Data Center A consists of the Coordination Office
and seven Subcenters:

World Data Center A
Coordination Office
National Academy of Sciences
2101 Constitution Avenue, N.W.
Washington, D.C., U.S.A. 20418
[Telephone: (202) 389-6478]

Glaciology: Rotation of the Earth:
World Data Center A: World Data Center A:
Glaciology Rotation of the Earth
U.S. Geological Survey U.S. Naval Observatory
1305 Tacoma, Washington, U.S.A. 98402 Washington, D.C., U.S.A. 20390
[Telephone: (206) 593-6506] [Telephone: (202) 254-4023]
Meteorology (and Nuclear Radiation): Solar-Terrestrial Physics (Solar and
Interplanetary Phenomena, Ionospheric
World Data Center A: Phenomena, Flare-Associated Events
Meteorology Geomagnetic Variations, Magnetospheric
National Climatic Center and Interplanetary Magnetic Phenomena
Federal Building Aurora, Cosmic Rays, Airglow):
Asheville, North Carolina, U.S.A. 28801
[Telephone: (704) 258-2850] World Data Center A
for Solar-Terrestrial Physics
Oceanography: Environmental Data Service, NOAA
Boulder, Colorado, U.S.A. 80302
World Data Center A: [Telephone: (303) 499-1000, Ext. 6467]
Oceanography
National Oceanic and Atmospheric Solid-Earth Geophysics (Seismology
Administration Tsunamis, Gravimetry, Earth Tides,
Washington, D. C., U.S.A. 20235 Recent Movements of the Earth's
[Telephone: (202) 634-7249] Crust, Magnetic Measurements
Paleomagnetism and Archeomagnetism,
Rockets and Satellites: Volcanology, Geothermics):
World Data Center A: World Data Center A
Rockets and Satellites for Solid-Earth Geophysics
Goddard Space Flight Center Environmental Data Service, NOAA
Code 601 Boulder, Colorado, U.S.A. 80302
Greenbelt, Maryland, U.S.A. 20771 (Telephone: (303) 499-1000, Ext. 6521]

[Telephone: (301) 982-6695]

Notes:

1, World Data Centers conduct international exchange of geophysical observations in
accordance with the principles set forth by the International Council of Scientific Unions.
WDC-A is established in the United States under the auspices of the National Academy of
Sciences.

2. Communications regarding data interchange matters in general and World Data Center
A as a whole should be addressed to: World Data Center A, Coordination Office (see address
above).

3. Inquiries and communications concerning data in specific disciplines should be
addressed to the appropriate subcenter listed above.



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46


COMMON SCALE MAGNETOGRAMS
BY STATION DAY
22 FEBRUARY 1976

a
LR ow

N.P.0. = 025.90 eae ee een ee ee
E.LONG., = 338.30

NAS cw

N.P.D. = 028.90 Pp re ea ne VA
E.LONG. = 314.80

FO ow LArenenr

sigs 2 a nen) a ae eee

BW oH Aa Aun lity are
N.P.O. = 018.70 ey

E.LONG, = 203.30

—— 10

me

ia)
&

Zo
6
nud
=o
se
So
oa
Ss

AI aw
NeP.D. = 021.70 i—j— 2
E.LONG. = 018.80

NN a nen Ce | rT
| | 4

{| | | {| | | | | tt

OUT.

4 8 12
SCALE IS 250 GAMMAS PER CM

16 20 24

30


SECTION III. PRELIMINARY AE(7) INDICES, FEBRUARY 1976

1. Discussion of Graphs, Tables, and Statistical Information

The following figures display the familiar AU, AL, AE, and AO graphs for each day of the month
and are based upon 1-min data samples. As indicated at the top of each frame, these indices are
derived from data from only seven auroral zone observatories and, as such, are considered "provisional.
WDC-A for Solar-Terrestrial Physics intends to update these indices during and after the IMS and to
publish "final" graphs and summary tables in the usual UAG Report format for each year.

Following the pages of AE graphs are Tables 1-4 (pages 45-48) containing the index (AE, AO, AU,
AL) amplitudes for each hour of each UT day of the month, the monthly averages for each hour and for
the hours of the designated 5Q and 5D days, and the average amplitudes for each day and for the whole
month. Tables 5-6 (pages 49-50) give the station having the largest hourly average positive and
negative deviations (hourly AU and AL) for each hour of each day in the month. These provide a key
to the graphs of AU and AL by usually indicating which station's magnetogram provided the extreme
deviations giving AU or AL for that hour. Sometimes the most extreme deviation during an hour will
have occurred at another station. The general patterns, however, of UT time of AU and AL provision
by each station are the same whether based on hourly averages or on minute-by-minute extremes.

Table 7 (page 51) gives the number of times (1-min intervals) during the month when the indicated
station provided the AU and AL index in each hour of the UT day. For the relatively sparse station
distribution used in this AE(7) derivation, it is not surprising that each station could produce at
least one extreme positive and negative deviation in almost every hour of the day. However, the overall
pattern is for the most frequent observation of the maximum positive H deviation to occur around 6 hours
before Local Geomagnetic Midnight (LGM) and the most negative H deviation to occur around 3 hours after
LGM [Allen and Kroeh], 1975]. Individual station deviations from this pattern may be due to the dominant
influence of a few isolated large substorms during a relatively quiet month. This should become apparent
as more months of data are similarly analyzed

Table 8 (page 51) gives the monthly average of quiet-time H for each observatory. This is com-
puted from the 1-min H scalings on the 5 quiet days of the month, using known or assumed H baselines.

Figures 2-5 (pages 52-55) graphically display the details suggested by the tabulation of hourly
station frequency of AU and AL contribution. The "frequency of 1-min AU provision by station" (Figure 2)
for the month is a smoothed curve showing the number of times that each station contributed the extreme
positive deviation from minute-to-minute, N(AU). An 11-point running mean was used on the raw numbers
of contributions for the 1440 1-min intervals of the UT day. Data for the UT day are duplicated (0000-
2400 UT shown twice) so that the end of the day will not interrupt the regular pattern of progressive
index contribution as each station rotates into the critical region (around 1800 LGT). Arrows mark
UT times of LGM for each station. Figure 3, on the opposite page, shows the "total amplitude of most
positive H variations." This is a smoothed graph for each station's cumulative amplitude of deviation
for each minute when it was providing the AU index. Each scale division on the right side represents
+500 gammas. Comparison of these curves with the N(AU) graphs of Figure 2 shows that the largest
magnitude positive excursions generally occur at the same time when the stations most often provide
AU indices. Occasional postmidnight minor peaks result from disturbances for which the H component
at one site is first a negative extreme (giving AL) for several minutes and then swings briefly to
a positive extreme before recovery. Such events are infrequently observed in AE indices derived
from 10 to 12 stations because usually another station is in position to monitor the true eastward
electrojet effect rather than having oscillatory variations near LGM providing AU.

The graph "frequency of 1-min AL provision by station" (Figure 4) shows the smoothed curve for
the number of times in the month that each station provided AL during each minute of the UT day,
N(AL). Evidently the pattern is for a station to rotate into the most probable region for encounter-
ing extreme negative H deviations some hours after LGM. Unusual, asymmetric peaks in frequency
of AL provision by any station may be attributed to disturbances on only a few days of the month.

Such unevenness due to a few isolated events should average out over the course of a year. Figure 5
shows the corresponding "total amplitude of most negative H variations." This is the cumulative
amplitude of negative H observed by each station during those minutes when they were providing AL.
Each scale division on the right side is -1000 gammas. Again, the comparison of cumulative amplitudes
and N(AL) curves can indicate the most probable time of occurrence of larger amplitude events.

For Figures 2-5 slightly elevated levels of the curve for any station during normally quiet hours

indicate possible difficulty with the quiet-time level for some days of the month. This information
will be used as a quality control check for the final derivations of AE(12) indices at a later date.

39


COMMGN SCALE MAGNETOGRAMS
BY STATION DAY
17 FEBRUARY 1976

a a a a ee a a ee

LR

N.P.De
E.LONG,

25 480
38 30

wo
es

E.LONG.

FC om ee
wad. pny ON
sg 2 ganas on i

TT 7
Nas am vo.s0 Pn ti, |
bmn
[ervey

baer
BW ow [a rf nt
. pylon
Eon i838 pw oy

TI ww
N.P.D. = 018.50 y
E.LON. = 129.00
ch
—— 10
DI ww Caan Renee eee i—— 8
N.P.D. = 016.50 8
E.LONG. = 080.50 —
7
— 6
—s
AT aw Ih +
N.P.O. = 021-70 — 3
E.LONG. = 018.80
2
jt 1
Pj fj fof pop pt tt pt tt pt 0
oO UT. 4 8 18 20 24

12
SCALE IS 250 GAMMAS PER CM
25


COMMON SCALE MAGNETGGRAMS
BY STATION DAY
1 FEBRUARY 1976

LR ow

N.P.D. = 025.90
E,LONG, = 338.30

NAS cw

NeP.Oe
E.LONG,

TTT
wae ncn ee Uni nA Geena

ane
i 2

FC wx Va al

NeP.D.
LONG,

on
g
3
a
&
8

BW

N.P.D.
E.LONG.

tactile
nrg, 2 ase mena
J fev

Bee
:

=
o-
3S
a
3

ch
|—— 10
=)
OI wm al pray Per at a nef Mon” Lo |
N.P.O. = 016.50
E.LONG, = 080.50 —|— 7
| 6
ji 5
|j—_+— 4 |
Al ww | penn tn ef Ye ; i
wigs 2 gene [WW Nps
non
Pott ttit tpt t ppp tp pe tp i o |
° UT. 4 8 12 16 20 24 i
SCALE IS 250 GAMMAS PER CM NGSOC (BOULDER) 77/03/11 |

9


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49


COMMON SCALE MAGNETOGRAMS
BY STATIGN DAY
4 FEBRUARY 1976

TTT TTT TTT TTT T

ne
LR oa rw |
N.P.O. = 025.90
E.LONG, = 338.30

Pye UN ‘ghd mead ert
NAS ap
N.P.D. = 028.90
E-LONG, = 314.60
FC wow Argel |
N.P.0. = 031.20 TWN ent
E.LONG. = 265.90
BW ot pen atthe nh Ve
N.P.«O. = 0186.70
E.LONG, = 203.30
TI on
NoP.O. = 018.50
E.LONO. = 129.00
DI (H eee en ED
N.P.O. = 016.50
E.LONO, = 080.50
Al ww banal
N.P.O. = 021.70
E,LONG, = 018.80
| i 4 | | | | | 4 {| | | !

oO UT. 4

SCALE IS

8 12
250 GAMMAS PER CM

12

18