COMMGN SCALE MAGNETOGRAMS
BY STATION DAY
8 JANUARY 1976

Se eee ee ee ee ee TTT TT Ty TT
|

LR am i | men

N.P.D. = 025.90 !

E.LONO. = 338.30

NAS cw

N.P.D. = 028.90

E.LONG,. = 114.80

FO ow

N.P.O. = 031.20
E.LONO. =

N.P.O. = 0!
E.LONG. = 2

BW cH Pe oan
meets A
|

TI tw ea a
N.P.D. = 018.50 i
E,LONO, = 129.00,
| cn
| —— 10
|
| —3
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; My LD,
6
5
+
|
AI ow pa >
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E.LONO, = 018.80 : ty
| | 4 | | 4 |_| 4 {|_| 1 | | | | | 4 0
OUT. ‘ 8 12 16 20 24
SCALE IS 250 GAMMAS PER CM
16


COMMON SCALE MAGNETOGRAMS
BY STATION DAY
29 JANUARY 1976

ee TTT 7 TTT 1 rd ee

CR oa

N.P.D. = 026.90 |
ELON. = 388.80 |

NAS ww Le

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E.LONO. = 314.60

|
an ro PW my penne eae

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N.P.D. = 018.70 | |
E.LONG. = 209.30 | Pg
| |
: |
|
: |

NP oO.
E.LONO.

FC ow

TI ow

N.P.D. = 018.50 |
E.LONG. = 129.00 |
' | cn
! — 10
| its
| le
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N.P.D. = 016.50 : —— 7
E.LONO. = 080.50 | 6
: y a
|
| 5
I —l«
| 3
Al ow i
NeP.D. = 021.70 ' —2
E-LONO. = 018.80 | 1
oe [tot Ltt Lt Ltt Ltt it 6

o UT. 4 8

12
SCALE IS 250 GAMMAS PER CM
37



LR ow
N.P.O. = 025.90
E.LONG. = 338.30
NAS cp
N.P.D. = 026.90

E.LONO. = 314.80

FC

x

)

N.P.0. = 081.20
E.LONG. = 265.90
BW tw

N.P.O. = 018.70
E.LONO. = 208.30
TI om

N.P.D. = 018.50
E.LONG. = 129.00
DI ow

W.P.D. = 016.50 |
E.LONG. = 080.50 |
Al ww

N.P.D. = 021.70
E.LONO. = 0186.80

COMMON SCALE MAGNETOGRAMS

Tro

BY STATION DAY
25 JANUARY 1976

TTT

ToT yp PT

‘|

| 3
| ils
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iT LL,
| ‘ te
|

I-r*
| Pram |
en Nnapatetmmrcemenies |
| toy
oe Lt Lt Lt LI tt
o U.T. 4 8 12 16 20 24
SCALE IS 250 GAMMAS PER CM

33



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88 88, 88 E28 7 F2e FE FEL ALOR 228 7 22

42


LR

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E.LONG,

NAS

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COMMON SCALE MAGNETGGRAMS

Pep Trop ro ror ep

BY STATION DAY
2 JANUARY

“TTT Ty

1976
TT

|_| | | | | 41

| | |

|_|

oO U.T. 4 8

SCALE IS 250 GAMM

12
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a
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UAG-48A,

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"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. D. 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 - April 1969)", by
W.L. Clark and T. E. 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/NGSDC, 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. Rawer, Institut fiir Physikalische Weltraumforschung,
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.

USCOMM-NOAA~ASHEVILLE, NC--7-20-77--2300



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48


COMMON SCALE MAGNETOGRAMS
BY STATION DAY
12 JANUARY 1976

[
|
|
|
|
|

Py PT TTT i Oe ee ee es es
\
LR aw
N.P.O. = 025.90 '
E.LONO. = 338.30
i
nas Toman ae aan anaemia aeallel
aH)
N.P.0. = 028.90 |
E.LONG. = 314.80
|
FC ox foo paprirroeb pep reel cent a IW nce
N.P.D. = 031.20 ey
E.LONG, = 265.90
BW NAA atm
we, 2 mee | Demnaca ae eee
|
|
TI om ee ee OS NO ee | |
N.P.0. = 018.50 aheatnen aed |
E.LONG. = 129.00 | |
| cH }
l7- 10 '
| ° |
TT {
DI ow Aral ator a |e |
N.P.0. = 016.50 mr I ten AN
E.LONO. = 080.50 7
/ 6
}
«5 |
i—— 4
—iacamnmnntinaes —lo3
bein fnaereinen ne
Al cw a Rae |
N.P.O. = 021.70 | 4
Famers oreo) pe Le Pe Pt 0 |
oUt. ry 8 12 16 20 24
SCALE IS 250 GAMMAS PER CM
20



COMMON SCALE MAGNETOGRANS
BY STATION DAY
30 JANUARY 1976

i i re
LR op ~ A
N.P.O. = 026.90
E.LONG. = 338.30

NAS cw credence)

N.P.O. = 028.90
E.LONG. = 314.60

Fe ® ot +20 Ty th ae

E.LONO. = 266.90

E.LONO. = 203.30

W :
BN. P no.10 | To

TI om
Mae. 2 S88 Ll TM
| cn
—— 10
DI tw On aan ls
N.P.D. = 016.50 i —+—s
E.LONG. = 080.50 |
| 7
va —+ 6s
5
| 4
AI wm Le ee ls
N.P.D. = 021-70
E.LONG. = 018.80 —— 2
1 1
i —
Lt} | | | | | | 4 |_ | 1 | | 4 a ° }
oO UT. ry 8 12 16 20 24
SCALE IS 250 GAMMAS PER CM

38



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
Boulder, Colorado 80302 USA

SECTION I. GENERAL DISCUSSION
1. Introduction

This IMS data report presents one of the most used types of ground-based data, j.e., analog records of
geomagnetic variations. Also given are tables, graphs, and statistics from the preliminary derivation of
AE indices based upon these records, It is anticipated that similar monthly data reports will be made
available on an increasingly timely basis for the entire IMS observing period, January 1976~December 1979.
As additional station records become available in time for processing, these will be added to later volumes
in this series. In particular, we expect to have daily stacked plots of magnetograms from the North
American meridional and longitudinal chains as well as the present selected Northern Hemisphere auroral
zone station records used in the preliminary AE index derivation.

2. Data Selection and Processini

The seven observatories supplying data for this report are shown in Figure 1. These are Leirvogur
(LR), Narssarssuaq (NAS), Fort Churchil1 (FC), Barrow (BH), Tixie Bay (TI), Dixon Island (DI), and Abisko
(AI). These were chosen from among the list of 12 observatories whose records are now routinely used by

_ BA i’ \ ae
. wel ZS>* tayll ; “
— rae, a “eed a

Fig. 1. Provisional AE(7) network.

1



LR

NeP.O.
E.LONo.

NAS

NAP.D.
E.LONO.

FC

NeP.D.
E.LONG,

BW

NP AD.
E.LONG.

TI

NsP.D.
E.LONG,

OI

N.P.D.
E.LONO.

|

018.70
203.30

CH)

= 016.50 |
= 129.00

cH) Ap os
= 016.50

= 080.50 |

ee ee

COMMON SCALE MAGNETOGRAMS

BY STATIGN DAY
23 JANUARY 1976

2 3

ToT T J T TT
ee Ok

|
|
|

.

\
|

L

|

1

| oe oe |

|
|

—4
— 8

2

OUT. 4 8 12
[SCALE IS 500 GAMMAS PER CM]

31

16 20



COMMON SCALE MAGNETGGRAMS
BY STATION DAY
9 JANUARY 1976

i ee ee TT TTT | Ty T TO
LR om Mpa Nene preett\|
N.P.D. = 025.90
E.LONG. = 9338.30
NAS a Las mvitnen | ws
N.P.D. = 026.90
E.LONG. = 314.80
FC wx SEE Ee ieee
N.P.O. = 031.20 aia
E.LONO. = 265.90
W ~~~ A
BN P te.70 a,
E.LONG. = 203.30
TI ow
N.P.D. = 018.50
E.LONO. = 29.00 |
| cn
—— 10
i—— 9
DI wm pe —-*
N.P.O. = 016.50 | i—— 7
E.LONC, = 080.50 va
i. 6
—j— 5
fa 4
Al aw | +*
N.P.D. = 021.70 i—|_ 2
E.LONG. = 018.80 ; i—— 1
| {| {| | | {|_| | {| | 1 | | |_| 0
O UT. 4 8 12 16 20 24
SCALE IS 250 GAMMAS PER CM

17



COMMON SCALE MAGNETOGRAMS
BY STATION DAY
15 JANUARY 1976

7 LTT PUTT Ty] TT od PT Ty TTT

LR ae hae

N.P.O. = 0%
E.LONG, = 338.30 |

|
t
|
|
|
|
|
t
|
t
|
|
|
|

NAS cw ; nner nner

N.P.D. = 0%
E.LONG, = 314.80

FC
N.P.O. = 031.20 i
E.LONG. = 265.90

TI Ieee nm
NP oO. 2 ote.so | Nomar

E-LONG. = 129.00 |

ch
—— 10

OI ¢

N.P.D.
E.LONO.

16.50
080.50

|
;
=

i—— 5

44

Al ww ls
NoP.D. = 021.70 —— 2
E.LONO. =

i——1

Pej fof fp tt} tp pt tt tpt yp ft py 0
Oo U.T.

4 8 12
SCALE IS 250 GAMMAS PER CM
23



COMMON SCALE MAGNETOGRAMS
BY STATION DAY
11 JANUARY 1976

ee | TTT TTT TT Tr

|
LR oa one

N.P.O. = 025.90

E.LONG. = 338.30

NAS a eR OO aa
Nas aon Ve ae)
Ler |

E.LONG.

f
;
i
|
|

E.LONO, = 265.90

|
re OM on.20 hoy
Rw

BW ow |
N.P.D. = 016.70 am vaeens andl
E.LONG. = 203.30 | .
|
| :
i
|
i
TI ow | — a) anaee
N.P.D. = 118.50
E.LONG, = 129.00
| |
ch |
—— 10 1
ls
DI wm Pe nennns meas een 8
N-P.D. = 016.50 | ——-
E.LONG. = 080.50 —+—7
, 6
—+— 5
ae er
AI ww e— yen a 4
N.P.D. = 021.70
E.LONG, = 016.80 +3
J+ 2
——1
{ | | ! {| 4 | | J | jf | 1 | | 4 0

oO U.T.

4 8 12
[SCALE IS 500 GAMMAS PER CM]
19



COMMON SCALE MAGNETOGRAMS
BY STATION DAY
24 JANUARY 1976

Fe es ee ee ee fe |
LR ob | J pineal pare n Lm payer}
0. = af 1
EsLoWD. = $38-30

NAS
W.P.0. 2 mean Nm ee Aiea ee

E.LONG.

FC a i a area meee
wes. = 081.20 Nin aoe’ ah caien iad

E.LONO.

. |
BW tH i . ]
ooo ore.20 et ne eee
E.LONO. = 203.30 | |
| | |
j |
|
! |
| |
|
ee ee
|
|

TI om |

N.P.0. = 018.50 | NN en |
E.LONO. = 129.00 | |
: cn
i 10
| |_Ls j
: i
DI wm a i Ny |
P.O. = al iF
PiLOND. = 080.80 | , —-"
i —-* \
i ls |
| .
Ls
Al wm ee and Perey |
N.P.D. = 021.70
E.LONO. = 018.80 1
{|_| 1 | | 4 |_| 1 on | | 4 |_| 4 0

oO u.T.

1 4 8 12
(SCALE IS 500 GAMMAS PER CM]
32



COMMON SCALE MAGNETOGRAMS
BY STATION DAY
6 JANUARY 1976

i ee ee Oe Os Oe
LR ow Naat
N.P.O. 2 oxs.80 tl ype pe te
E.LONG, = 338.30
NAS cm Pn nn| |
wale 2 egg [Ty pt |
| |
|
|
FC |
N.P.D.  o1.20 innit. tenes eens anneal i
E.LONG. = 266.90 | |
|
BW ow | pe |
N.P.D. = 018.70 oe oy ples i
E.LONG, = 203.30 1 |
|
| | |
|

—— 10

NP.D.
LONG,

TI |
N.P.D. Oo r0.s0 We per : |
E.LONG. = 129.00 |

DI H) re tt trend Vass va
= —— 7

me J

\

+6

4

—1

{| fj tf pe pp | ft tp | tt pt | | tt tf 0

oO UT.

4 8 12
SCALE IS 250 GAMMAS PER CM
14





Piha ntti! ae we}

82,

eS | (oS. ABO TL Nve 926T

oL6l AUWANUC
SUOLILAEA Z - SHYYOOLINYW 3TVIS NONWOD


COMMON SCALE MAGNETOGRAMS
BY STATION DAY
21 JANUARY 1976

i 1 es TTT TTT] Tt
|

LR oom V\ mm eard

re gag yo a

NAS a [fer eh pte nln
Bm 2 ag een iw:

FC om Lem |

NsP.D. = 081.20 | pr el
E,LONG, = 265.90 |

BW

NeP.De
E.LONO,

TI
NPD.
E.LONo,
ch
— 10 |
|_9
DI |_o
NaP De
E,LONO, |
|_¢
L_6
14
Al r—§
NsP.D. |_ 2
E.LONo,
toa
{| | | | | 4 |_| 41 0

oO U.T.

T ‘ 8 12
SCALE 1S 250 GAMMAS PER CM
29



|

COMMON SCALE MAGNETOGRAMS
BY STATION DAY
18 JANUARY 1976

i Prt Ty] Tt ty

adhere, Apr

FC wx

NeP.D. = 091-20 ©
E.LONO. = 265.90 |

BW ow)

NPD. =
EsLONO. = 209-30 —

Ye
NAS op
rare NN pag
|
bh
1
Avra}
|
|

Tl an Al

N.P.D. = 018.50
E.LONO, = 129.00 |

i—— 10
9»
Ol ww oA npnnprrnniin [eS
WP.0. = 016.80 | NO °
E.LONG. = 060.50 +7
Z 6
ps |
+.
! —— 3
Al a eee eed rr te
NeP.O. = 021.70 |
E.LONG. = 018.80 ‘ i—— 1
Lett | | | {| | | {| | 4 | || | | 4 °

0 UT. 16 20 24

4 8 12
SCALE IS 250 GAMMAS PER CM
26



4. Acknowledgements

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 whc patiently curve-follow, check, and correct
the data from which this report is compiled. Mr. W. 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 cor-
respond with the authors. This is very much a prototype publication and we expect to make changes during
the months before the dedicated IMS satellites are operational.

5. REFERENCES

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

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

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

L. D. MORRIS

ALLEN, J. He, 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. H., 1975c 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 UAG-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. Ree. 71, 785-801,

Z



WDC-A for Solar-Terrestrial Physics in the derivation of Auroral Electrojet (AE) magnetic activity in-
dices. 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 observations. Each component's amplitude
is recorded every 10 seconds on magnetic tape, and analog chart records are prepared as back up data.

These high-time-resolution digital data are processed at central facilities responsible for each observa-
tory. Obvious errors (usually spikes) are corrected and 1-min average values are computed. These preli-
minary data are sent on tape to WOC-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 semi-
automatic scaling equipment. Resulting digital tapes of component amplitudes 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 origina
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
or intermixing of analog traces during large, rapid field fluctuations. Every reasonable effort is made
at WOC-A for Solar-Terrestrial Physics to curve-follow disturbed traces. Sometimes, however, this gives
improbable results and we choose to suppress some data. An example of this is in the D-Trace at Dixon
Island late in the day of 10 January 1977. AE-max was about 1700 gammas (1 gamma = 1 nanoTesla), but the
apparent change in D was some 30° east during a time when all three traces were confusingly intermixed.
Because of our uncertainty about this variation and of our desire to maintain a reasonable amplitude
scale for the common-scale D stack plots, we suppressed digitization of Dixon's D for several hours dur-
ing this event. Effects 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 superposed 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 limi-
tations of AE indices, even when derived from a relatively complete station network. Additional notes
on AE are given before the daily index graphs (page 40) and the figures based upon minute-to-minute
"frequency of index provision" by each station. Given in this report for the first time are figures

showing the cumulative amplitude of H-deviation for times when each station was providing AU and AL indices
(pages 55 and 57).



COMMON SCALE MAGNETOGRAMS
BY STATIGN DAY
7 JANUARY 1976

a LP yy a TTT TTT PTT

LR ow ahr, ,
N.P.O. 025.90

E-LONO, = 338.30

Nes ~ 28 90 nn ane fe

E-LONG, =

FC om mn.
EsLOW. 2 208-30 YN JO

TI ow ———~~~_., {———_|
N.P.D. = 018.50 '
E.LONO, = 129.00 V |

: Ln antl nn rr lo.
eA]
DI wm _—~_ a —-"
N.P.D. 16.50 va

AI ww fs ene ean
N.P.D. = 021.70 —— 2
E.LONG. = 018.80 1
{| | |_| 4 | | 4 on | || on 0

out. 4 16 20 24

8 12
SCALE IS 250 GAMMAS PER CM
15



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Je etd tr gl oO S AvQ cin | NVE 9Z6T

ns ee ns TT ~ ar ry YT POT Te

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COMMON SCALE MAGNETOGRAMS
BY STATION DAY
13. JANUARY 1976
ee ee ee CTT TT tT
7
LR aw \

NsP.D. = 025.90 | thal
E.LONO. = 338.30 rane ane

|
|
I

|
f
i
|
t
j
i

NAS cH

4 |

pet |

NP.O. 028.90 WA '
314.80

E.LONO,

FC «x
WePe. = 09ne20 | pyc pene antec pe rent

E.LONO, = 265.90

BW cH ;
N.P.D. = 018.70 ied ene Wa ane wy
E.LONO. = 203.30

TI pr
NAP .De P o10.60 ON eo

E,LONG. = 129.00

\—-— 10
DI Te
CH)

wP.0. = 016.60 | Wy end —— 8
tits, aE | 6. eees tae
, —— 6

—— 6

—— 4

——3

Al om (nr mene 2
N.P.D. = 021.70 ~~
E.LONG. = 018.80 fj 2
|_| 1 | | | | | 4 |_| | {| J | | | 4 0

U.T.

|

0 4 8 12
SCALE IS 250 GAMMAS PER CM
21



WORLD DATA CENTER A
for

Solar-Terrestrial Physics

REPORT UAG - 60

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

July 1977

IMS DATA PUBLICATION No. 1 |


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44


2. Stacked Common-Scale Magnetograms by Station Day (H Variation)

The following stacked plots of H (or X) common-scale magnetograms are reproduced from the digital
magnetic variations data obtained as described above. Each station is identified by the abbreviation
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 lower
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 10-11 January 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. We hope by March 1978 to have achieved a minimum steady-
state acquisition, processing, and publication schedule with a delay time of 2 or 3 months from the end
of data recording to publication for a given month.



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57


SECTION III. PRELIMINARY AE(7) INDICES, JANUARY 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 47-50) 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 51-52) 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 minute-by-minute extremes.

Table 7 (page 53) 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
L6M [Allen and Kroeh1, 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 (p. 53) gives the monthly average of quiet-time H for each observatory. This is computed
from the 1-minute H scalings on the five Q-days of the month, using known or assumed H baselines.

Figures 2-5 (pages 54-57) graphically display the details suggested by the tabulation of hourly ta-
tion 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 posi-
tive 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. Post-midnight.
minor peaks are the result of large positive deviations on only 2 disturbed days and typically result from
variations such that one station first supplied AL indices for several minutes and then the H-component at

(Text continued on page 46)

2. Graphs of AU,AL,AE, and AO for Each Day of the Month

CT PADETIC INDICES _07 ms Ic INDICES _o7

ww
au au
TM TM
: / 7 1
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Sow San
AL aL
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40



COMMON SCALE MAGNETOGRAMS
BY STATION DAY
20 JANUARY 1976

Por 2 Des fe sO |

|
LR ap
N.P.D. = 026.90 aaa cea el aioe a alemeoen eeaatiinin ices)

E.LONG, = 338.30

NAS tw

NeP.D. =
E.LONC, = 314.80 |

|
|
Fe a. 20 naumeaan\ |," Aeaneeeame anand

E.LONO.

BW ow

N.P.D. = 018.70
E.LONO. =

B

¢

5
Lode

i—t+— 4

—j— 3

AI ww

W.P.D. = 021.70 |
E.LONO. = 018.80

oe

i
|
|
Ly pitirtiiiiritisitiiiztiiiit,
0 16 20 24
SCALE IS 250 GAMMAS PER CH

28



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COMMON SCALE MAGNETOGRANS
BY STATION DAY
19 JANUARY 1976

ee ee ee TTT TTT TTP

N.P.O. =
E.LONG. = 338.30 |

|

i

1

|

\

|
NAS cH

| french YIM

N.P.D. = 028.90 ey ere
E.LONG. = 314.80

FC —_—.
NeP.D. a 91.20 : In’ «ime ee er coeeliene  e  ae|

E.LONO,

BW ww

Has aa eo" [more

TI ow

NeP.O. =
E.LONG. =

—— 10

fare

|

|
DI nent a 6
N.P.D. 2 re.s0 : Nin gel | >

E.LONO. = 080.60

i 2,

|

3
Al am been, Wh HAN mnrel |
N.P.O. = 021.70 | ——2
E.LONO, = 018.60 | Ly

Lip r trp trpy tur r trp r tity Jt,

oO U.T. 16 20 24

‘ 8 12
SCALE IS 250 GAMMAS 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 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.De
E.LONG,

NAS

NAP.O.
E.LONG.

FC

N.P.D.
E.LONO,

BW

NAP.De
E.LONG,

TI.
N.P.D.
E.LONO.

OI

N.P.D.
E.LONG.

AI

N.P.D.
E.LONO.

COMMON SCALE MAGNETOGRAMS

BY STATION DAY

10 JANUARY 1976
; | oe eee eee ee ee ee ee ee ee TT “1
|
(H) _
= 028.90 Payee
= 338.30
|
i
pe .
= 028.90 [nye
= 314.80 |
|
|
|
|
ea) |
= 031.20 rOCt*sd PN tN nn ART
= 265.90 |
| ; |
a a |
= 018.70 | wy anv aren
= 203.30 | |
| | |
i !
| |
cH) | yp |
= 018.50 | ro i
= 129.00
| cn
j ——10
|»
H) aan e
= 016.50 ay wie —-
= 080.50 7
7
6
+5
—4
a NNN Na ts
= 021.70 aa Vaal
= 018.80 . | 2
1
ut | | | 41 |_| | {| | | | | °
o U.T. 16 20 24

[sca

T 4 8 12
LE IS 500 GAMMAS PER CM]

18



a

A A

3

z

FE

FE

2

?

a

55


LR

NP «De
E.LONG.

NAS

NaP.D.

(nH)

E.LONG. = 314.80

NeP.De
E.LONG,

TI

NP.O.
E.LONO.

AI

NP .D.
E.LONO.

2
8
8
@
$

021.70

COMMON SCALE MAGNETOGRAMS

BY STATION DAY
27 JANUARY 1976

re TOT T TTT

pra

cH

—— 10

—— 9

4

— 3

018.80

|_| |

{| | 1 | | | |

oO UAT.

SCALE IS

‘ 8 12
250 GAMMAS PER CM
35



COMMON SCALE MAGNETGGRAMS
BY STATIGN DAY
28 JANUARY 1976

{i ee Oe ee Oe ee ee es
i
LR oa P
N.P.D. = 025.90 |
E.LONG. = 336.30 |
NAS cw |
Eiuone, = 814-60 |
|
|
i |
iu f
FC «x fen} | |
: i
Cons. 2 Sance | et
|
| . |
BW cw Lenten — | |
N.P.O. = 018.70 | yt 1 }
E.LONO. = 203.30 | i
i |
! \
TI ow : i
N.p.o. = 018.60 | NL |
E.LONG. = 129.00 | |
| cn
| —— 10
| T:
Ol wm. ——_ Hpieticrmnnypro——t
N.P.D. = oie.so | oy efeneee F
E.LONG. = 080.50 | , toe
| tse |
| js
| ts
AI am k nin :
N.P.D. = 021.70 | ——
E.LONO. = 018.80 | 1
Peru tpre tire tipi tipi try i te
oO UAT. 4 8 12 16 20 24
SCALE IS 250 GAMMAS PER CM
36



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5


COMMON SCALE MAGNETGGRAMS
BY STATION DAY
16 JANUARY 1976

ee ee es OO

LR wm \ a
fas 2 meso wy

—

|
NAS
N.P.D. P oes.80 (al am

E.LONO. = 314.80

FC
N.P.D. Poot -20 pe
E,LONO. = 265.90

BW [enn vernn en pa enna
N.P.D. PP pno.t0 nanan eas eet |
E,LONO, = 203.30 |

TI om

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

P.0. = 016.50

Dl ow
N
E.LONG. = 080.50

Al «ww
N.P.D. = 021.70
E.LONG. = 016.60

{oj | jf | | | | | | ft

oO UAT.

4 8 12
SCALE IS 250 GAMMAS PER CM
24



9Z61 Asen Jw-, jo Aduenbes4
ra z ch sl el st a

it I I I I TI T IT

s Wr LT bn LS
1 naar | nna

all hei VW

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al Ne)

SHA" et aed

rf Vey afi]
a a a as



SECTION

aReNne

SECTION

1.
2.

SECTION

oBene

TABLE OF CONTENTS

I: GENERAL DISCUSSION

Introduction

Data Selection and Processing

Auroral Electrojet Magnetic Activity Indices
Acknowledgements

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 Variation)

III: PRELIMINARY AE(7) INDICES, JANUARY 1976

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

Tables of Observatories Supplying Hourly AU and AL
Statistical Information

Page

wownee

on

40
40
47

53



43

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AU AU
” in| _
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: Liat oy 1 PPPP TS rity
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‘w ‘oe
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TM a bole a
wo STAGETIC HOLES oy on MAG ETIC HOIGES 97
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TM =
eenenee Loy 4 pean Rata hen JY
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76/01/07 _| = 7601708 _|
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‘te Es
“= tse
aren mW CE il
Ag) AO
ma TM a

41



LR

NsP.D.

E.LONG.

NAS

N-P.D.

E.LONG,

FC

NP.De

E.LONO.

TI

N.P.O.

E.LONG,

DI

N.P.D.

LONG,

Al

N.P.De

E.LONG.

=

COMMGN SCALE MAGNETOGRAMS
BY STATIGN DAY
3 JANUARY 1976

PEP I PPP Te apt epa
a28.90 eeeceiein Wlnetnetnd enentintien catneenn ammnee Nano
338.30
|
028.90 | pene er
314.80 |
|
|
ns nat 6 sone eae
265.90 |
|
| |
i iaeaal
018.70 i
203.30 |
j :
018.50 Wena, pm
129.00 | i
| cn
1 a 10
|
| Asn | +
016.50 | |4- 8
080.50 |
i 7
4 itis
i iis
|
yl a
021.70 j fp 2
018.80 | j
| i441
i |_| | || || | 1} Lot! 0
O UAT. 4 8 12 16 20 24
SCALE IS 250 GAMMAS PER CM

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53


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COMMON SCALE MAGNETOGRAMS
BY STATION DAY
5 JANUARY 1976

' 1 ee ef ToT TY TT T~ TTT
LR ow |
N.P.D. = 026.90 ae ene as ee ren iti
E.LONG. = 338.30

NAS cH map enn al

N.P.O.
E.LONG,

FC x buerraretenn |

N.P.D. = 081.20 DN yet YT
E,LONG. = 265.90
|

BW tH A pastnnentrersel

N.P.D. = 018.70
E-LONG. = 203.30
i
TI om i el
N.P.O. = 018.50 ann
E.LONG, = 129.00
'
1
DI ow Ae Torn)
NeP.D. = 016.50 |
E.LONG. = 080.50 .

Al wm pad Pa aren Natt YON fi
NoP.D. = 021.70
E.LONG. = 018.80

{| fof | ft ptf tt ft tt pt | tt tt | yy

oO U.T. 16 20 24

4 . 8 12
SCALE IS 250 GAMMAS PER CM
13



WORLD DATA CENTER A
for
Solar-Terrestrial Physics

REPORT UAG - 60

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

by

J. H. Allen, C. A. Abston and L. R. Morris

National Geophysical and Solar-Terrestrial Data Center
Boulder, Colorado 80302 USA

July 1977

Published by World Data Center A for siz

Solar-Terrestrial Physics, NOAA, Boulder, Colorado
and printed by

U.S. DEPARTMENT OF COMMERCE % SS
NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION TIWS
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PRICE THIS ISSUE $1.07



NAS

NP .De

E,LONO,

FC

NAP .D.

E.LONO.

BW

NP .D.
E.LONG,

NAP .D.

E.LONG.

Al

NAP .D.

€.LONG.

COMMON SCALE MAGNETOGRAMS

BY STATION DAY

26 JANUARY 1976
1 Te TTT TTT Trey tT y tt
cw)
= 025.90
= 336.30 |
i
am ee
= 028.90 he
= 314.80
|
(es)
= 081.20 | V
= 265.90
(H) aE evens
= 018.70 | a :
= 203.30 |
—
! cn
i Ie 10
| +
am) | UA tt.
= 016.50 | oo \++7
= 080.50 | y |
i 4-°
—ts5
| i— +
|
i its
cH) h
= 021.70 | re ite
= 018.80
: i
SO POG OD GD GO GC
OUT. 16 20 24

4 8 12
SCALE IS 250 GAMMAS PER CM

34



NAS

NAP.O.

E.LONO.

FC

WP 6D.

E.LONG,

BW

NP 6D.

E.LONo.

TI

NAP.D.

E.LONO.

BI

N.P.D.

E.LONG,

Al

N.P.D.

E.LONO.

018.70
203.30

018.50
129.00

021.70
018.80

COMMON SCALE MAGNETGGRAMS

BY STATION DAY

Ane Vaan eae

14 JANUARY 1976
pT TT TTT yt TT ToT yor
Dee NN
Re aed Re coal cone hace Gace emule
Jere paperadtarent Tt ort aren or
ee
Lage Ap Negnmnns 4}

oO UAT.

SCA

T
LE IS

4

22

8 12
250 GAMMAS PER CM

|



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
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[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,
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[Telephone: (704) 258-2850] World Data Center A
for Solar-Terrestrial Physics
Oceanography: Environmental Data Service, NOAA
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Oceanography
National Oceanic and Atmospheric Solid-Earth Geophysics (Seismology,
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[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.



(Text continued from page 40)

that location swung from extreme negative to extreme positive before recovery. Such events are infrequently
observed in AE indices derived from 10 to 12 stations because usually some station is in position to mon-
itor 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 encountering extreme
negative H-deviations some hours after LGM. Unusual, asymmetric peaks in frequency of AL provision by any
station may seemingly be attributed to disturbances on only a few days of the month. Barrow shows this
for January 1976, when N(AL) reaches a peak about 1340 UT (only 1 hour after LGM). The stacked day plots
for 20, 22, 23, and 29 January show Barrow with relatively large negative variations around 1300 UT, while
all other stations are much less disturbed or even quiet. 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 example, for January 1976, Barrow had a double peak in total amplitude,
but the second, higher peak (around 1630 UT) corresponds to more frequent large 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.

46



COMMON SCALE MAGNETOGRAMS
BY STATION DAY
22 JANUARY 1976

Le Qe sO es OO
LR oa

NeP.O. =
E.LONO. = 338.30

FC wm

NeP.D. = 031.20 | Rap yr nen or
E.LONG. = 265.90 |

BW ow NONE
ets. 2 32 | ae

NAS
NP.De P oe.80 aay, act
E.LONO. = 314.80

TI om
NOP.D. =
E.LONG. = 129.00

—— 10 i

\

|

1

i

i

|

|
DI om len nema peel Arb npet ttn eadterenet
N.P.D. = 016.50
E.LONG. = 080.50

vi yw
Wey

Al ow +s
Nep.. = 021.70 | 2
E.LONO. = 018.80 : Tt
i
t

[OO OO

U.T. 4 8

|

|

0 12

SCALE IS 250 GAMMAS PER CM
30



LR ow

Pin pet
N.P.O. = 025.90

E.LONO,

NAS
N.P.D. 2 cee.20 Pa fh nat

E.LONG, = 314.80

FO

|
N.P.D. = 081.20 |
E,LONO. = 265.90 |

BW ow

ec nace ae a
NeP.D. = 018.70 ’ ant haath

E.LONO, = 203.30 |

|
|
|

TI wm

COMMON SCALE MAGNETOGRAMS
BY STATION DAY

31 JANUARY

1976

TOP Lyte 7 TOT T

N.P.O. = 018.50
E.LONO. = 129.00 |

|
DI wm

N.P.D. = 016.60 |
E.LONO. = 080.50 |

AI ww
N.P.0. = 021.70
E.LONG. = 018.80

fj J { | | | | | tt

U.Ts 4 L} 12
CALE IS 500 GAMMAS PER CM]

39



COMMON SCALE MAGNETOGRAMS
BY STATION DAY
17 JANUARY 1976

i ee ee ee fe ee

L Ny
Penal yoo

LR

N.P.D.
€.LONO.

NAS

N.P.De
€-LONO.

FC Oe er |
N.P.De : |
E.LONO. |
| |
|
BW ww |
N.P.0. = 018.70 hedneiinc a yah |
E.LONG. = 203.30 | |
| :
i | |
TI om |
N.P.D. = 018.50 bh naval
E.LON, = 129.00 | |
| |
| |
cn
—— 10
DI ow 8
N.P.D. = 016.50 a ene a 6
E.LONO. = 080.50
wt
/ 6
—s
i—j— +
AI wm anh aarp rou ——3
N.P.D. = 021.70 2 |
E,LONG. = 018.00 —
1
| 1 4 || 4 Lt [1 | | | [| 4 o
OUT. ‘ 8 12 16 20 24
SCALE IS 250 GAMMAS PER CM
25



COMMON SCALE MAGNETGGRAMS
BY STATION DAY
1 JANUARY 1976

pil ee De OO

|
LR oa ipaaienomacaen
N.P.D. = 025.90
E-LONG, = 338.30 |

i

i
NAS cw Linn nar} Lat
N.P.0. = 028.90 | "
E.LONG. = 314.81

E.LONG.

FC tx) oe perpen
N.P.D. 031.20 nd een oe,

|

|

|

nt

BW ow faerie

N.P.D. = 018.70 CW, nye

E.LONG. = 203.30

TI om i _|
N.P.O. 018.50 ° |

E.LONG. = 129.00 |

cn

—— 10
1 — 9
DI ow : A oun —-*
N.P.O. = 016.50 ro avn 7
E.LONG, = 080.50

7 i—_|—_ 6
| i—— 5
ty
Al wm a 7°
NeP.D. = 021.70 | —— 2
E.LONG. = 018.80 | toy
itt | | | [| | 4 [| | 1 1 1 | {| 4 0

oO UAT. 4 8 12 16 20 24

SCALE IS 250 GAMMAS PER CM NGSOC (BOULDER. 77/01/13

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49


COMMON SCALE MAGNETGGRAMS

BY STATION DAY |
4 JANUARY 1976 |
eee ee ee ee ee ee ee |
|
i
LR ow |
N.P.D. 26.00 een fanny pg Bin fmm Dera |
E.LONG. = 338.30 | t
|
|
{
FC ow ima |
tifons, 2 98688 lesen oaiieed aie

N.P.D.
E.LONO.

BW oH Lemna _|

E,LONO. =

oan aad

|

avian ne

roe ose | or a ee
Prone | my

29-00

| cn

| —— 10

DI ow 8

NPL. = 016.60 | rte etn eM! 6
E,LONG, = 080.60

1

“ — 6

| os

jo

Al ww Rat aren NA el tl Le

EiLane. 2 010.00 *

jj 1

LJ 41 [| 1 4 | 114 | 1 1 | 0

0 UT. 4

8 12
SCALE IS 250 GAMMAS PER CM
12