COMMGN SCALE MAGNETGGRAMS
BY STATION DAY
8 MARCH 1976

LR oom Wen pp |

N.P.O. = 025.90
E.LONG. =

nas SR pelt ei nN AAP
NPD. ° 128 «80 We | Paes

ee

E-LONG. 14.80 I
|

FO ox Leen ner |

N-P.D. = 031.20 Pee eign pene

E.LONG, = 265.90 |
|

BW ow or rma Jperneony tT} |

N.P.O. = 016.70 Pay Oo lt k

E.LONG. = 203.30 }

|
;

DOI om
N.P.D. = 016.50
= Of

+7
E,LONG. = 080.50

| _6

i 5 |

4 |

ee |

Wie ple te |

Al mw |

N.P.D. = 021.70 2 |

E.LONG, = 018.80 ;

Ptiti tity fey tt ppp ep yt ty 0 |
oOo _U.T. 16 20 24

T 4 8 12 i
[SCALE IS 500 GAMMAS PER cM] |

16


COMMON SCALE MAGNETOGRAMS
BY STATION DAY
29 MARCH 1976

TTT) Tt tty? tt pt Tt

TTT
Re Rt AN ent
LR
N.P.D. = 025.90
E.LONO, = 338.30

NAS cn wn 4~ in es
N.P.O. = 026.90 ~ VIN
E.LONG, = 314.60
FC wx

[pen ed
N.P.D. = 031.20 forty
E.LONO, = 265.90

BW | Lene aon a'd eeecaion ceteaed

NeP.D. =
E,LONG. = 203.30

TI om Oe Oe ae

NeP.0. = 018.50
E,LONO, = 129.00

cn

|\—— 10

|»

8

DI ww LA pean TM el ent ye orn

N.P.O. = 016.50 1
E.LONG. = 080.50

—— 6

5

Hl 4

Al w [otha mtn jp |g
N.P.D. = 021-70

E.LONG. = 018.80 +?

1

Lopt tt py | tp tp tt tt tt 0

2 UT.

4 8 12
SCALE IS 250 GAMMAS PER CM
37


COMMON SCALE MAGNETGGRANS
BY STATION DAY
25 MARCH 1976

TTT TTT TTT TTT TTT TT
LR ow
N.P.D. = 025.90
E.LONG. = 338.30
NAS ww pane
N.P.D. = 028.90 [~
E.LONG. = 314.80
FC tx eee |
N.P.O. = 031.20 WAL
E.LONG. = 265.90
BW ou | | penn
N.P.O. = 010.70
E.LONG. = 203.30
TI ow
NoP.D. = 18.50
E.LONG, = 129.00
ch
i—— 10
—— 9
DI om |e
N.P.0. = 016.50 jerome 7
E.LONG, = 080.50
\—+— 6
i 5
fee 4
i—— 3
Al ow LL ae
N.P.0. = 021.70 jp 2
E.LONO. = 018.60 1
{_ | 4 {| J | J 4 { | | {|_| 1 {| 4 °

Oo UT. 4 8

12
SCALE IS 250 GAMMAS PER CM
33


w» AURORAL ELECTROJET MAG INDICES AE(7) wy AURORAL ELECTROJET MAG INDICES AE(7)

:
AU AU
TM -
+ Maal MWh eet 2 fa Hel fuel ala baht beJralarla bef
" In 4 " fe hu I
ba val Nh iE Mee PI |
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wt ‘w
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4 1 tf | 4 A |
Q VN : Wk Vy ft ry |
Pek ef 5 rye
to W ha Ao w/| ity (|
\
vw AURORAL ELECTROJET MAG INDICES AE(7) vm AURORAL ELECTROJET AG INDICES AE(7)
AU AU
-
ty bla Lael i fot Tatars + atthe aA] ld dead |
: pm) H ta
: : Wh rahi
au bah f Ma San il M wy
AL AL y
a 0
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AE AE
w ‘we
H he ‘
ta tw Ll a
_ bale [Lt : PM mT LV
isl il NW ish TY)
0 Pf 4
, AURORAL ELECTROJET MAG INDICES AE(7) AURORAL ELECTROJET MAG INDICES AE(7)
AU AU
” or
my Ll LjMadsha) 1 Ns Li
: = ' eae
i Mee NT TM 1, DM
AL AL
‘0 ‘0
6703/13 | rero3/i4 |
a os
AE Ag
0 ‘we
‘ L ‘
Poy 4. Pr)
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fe ba 5 PARA
AO AO
Fo a] Eo d
42



COMMON SCALE MAGNETGGRAMS
BY STATION DAY
2 MARCH 1976

LR uw ee OU es oO
N.P.O. = 025.90 roo pe aay
E.LONG, = 338.30

E-LONG.

FC pom al
N.P.D. 2 pet20 a ith aed eens ea eer, aes eel
2

LONG.

E, LONG.

en. 2 sem ET I yd

—— 10
I i——. 9
DI oom tN diel ner .
igs 2 maas wl i
i—|-_ 6
ji—t— 5.
i—t 4
been NN | | 3
Al om PN tr
N.P.D. = 021.70 rSSCS Nowa plL
E.LONG, = 018.80 ty
il | 1 |_| | | J | | Jt {J | | J 4 0
oO U.T. 4 8 12 16 20 24
(SCALE IS 500 GAMMAS PER cM]

10



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UAG-48A

UAG-49

UAG-50

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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, D0. 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. £. 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 Haskel1 Allen, Carl C. Abston and Leslie D.
Norris, 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.

USCOM-NOAA-ASHEVILLE, NC-9/77/2300



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48


COMMON SCALE MAGNETOGRAMS
BY STATION DAY i
12 MARCH 1976 t

TTT
jostle eye a Ne

LR ow Nene oy"
N.P.D. = 025.90
E.LONG. = 338.30

eel ane |
NAS ] i
NAS ieee i rT n/N prc pare ~—\ rn |
E.LONG, = . i

Mas 2 ee TW emo hieneneniines
BW ow Wee Les | a

N.P.O. = 018.70
E.LONG. = 2

Tl w ppm tri a
a. ML WV |
ch
—— 10
ea valaw —-°
OI ow name ON NYE
N.P.D. = 016.50 =
E.LONO. = 080.50
i——_ 6
—— 56
Layne nN tah ptt te np —— *
|—+— 3
Al am nw | le
N.P.O. = 021.70
E.LONG, = 018.80 I—j— 1
Popp tp tt tt tt tp pe ptt pt te 0

OUT. 4 8

12
SCALE IS 250 GAMMAS PER CM
20



COMMGN SCALE MAGNETGGRAMS
BY STATION DAY
30 MARCH 1976

a Da

\ J

LR ee a nS a ONC
NAP.D. = 026.90
E,LON, = 338.30
|
NAS cH b+ ~~
N.P.D. = 020.90 Pel
ELON, = 314.00
FO wm R Lan mv} |

NeP.O.
E.LONG.

|

:
in
2

TI am wl |
titans. 2 fasiee ‘ S| |
aA

Al om ae js
NeP.D. = 021.70 2
E.LONC. = 018.80 —— }
—— 1
LJ] {| 1 4 | | 4 [1 1 [| | 1 Lt | 0
oO UT. 4 16 20 24

® 12
SCALE IS 250 GAMMAS PER CM
38


Geomagnetic Data for March 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 third of a series of data reports in support of the International Magnetospheric
Study (IMS) and includes selected geomagnetic variation data for March 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 sta-
tistics. 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

LY

Fig. 1. Provisional AE(7) network.

1


COMMON SCALE MAGNETGGRAMS
BY STATION DAY
23° MARCH 1976

rT?ry?rtrytrtttytrttry?ttty7t tt

ja
25 «80
38.30

LR

NAP «De
€.LONG,

=

ee

na

N.P.O. = 028.90
E.LONG. = 314.80
| perenne
FC ~~
N«P.O. = 031.20
E.LONG., = 265.90

TI ow
N.P.D.
E.LONG,

BW stm TT | apeertneny}
N.P.D. = 018.70
E.LONG. = 203.30

018.50
129.00

cn
——- 10
ls
DI mm EG ae
N.P.O. = 016.50

E.LONG, = 080.60 a)
i—j— 6
— 5
—— 4
—. 3

Al cw L_ Ha
N.P.O. = 021.70 jf} 2
E.LONG, = 018.80 1
{| | 4 {| | 4 | | | | | | | | | | | 4 °

oO UT. 16 20 24

4 8 12
SCALE IS 250 GAMMAS PER CM
31


COMMON SCALE MAGNETGGRAMS
BY STATION DAY
9 MARCH 1976

TTT TT 7 TT TTT TT 7 TT 1
LR oa Iprretnennsmyerr yen
NeP.0. = 026.90 vy ane pee
E.LONG. = 336.30
NAS om cet NAAN plat
rear Ved ae J
FC x
target Wwe OY Lyn
BW cH
N.P.D. = : aan pee, ye
E.LONG, =

ch |

—— 10 '

il» |

DI oom bennrmnn After rnrnynrnrty nr }

N.P.D. = 016.50 |e |
E.LONO. = 080.50 1

i—|— 6 i

|

—| os :

ate |

DAW

Al ww aT cane tos |

N.P.0. = 021.70 aw, |
E,LONO. = 018.60 —_|-2
i—— 1
LJ 4 | J {14 | 1 4 |_| 1 J Jt 0

oO U.T.

4 8 12
(SCALE IS 500 GAMMAS PER CM]
7



FC

N.P.D.

LONG.

BW

NAP.D.

E.LONG.

DI

NP «De

E-LONO.

AI

NAP.D.

E.LONG,

021.70
018.60

COMMON SCALE MAGNETOGRAMS

BY STATION DAY
15 MARCH

1976

es ae yr nenaeetains
nr acne
cH
i 19
oh yond Nera mnt bw leat 2
i—_|_ 8
—
i—— 6
oon
——j— 4
Lah —— §
ceeeenans Ccmcemernomen pease oem _L,
can
|_| 1 |_| 4 |_| 4 {| | 1 °
O UT. 4 8 12 16 20 24
SCALE IS 250 GAMMAS PER CN

23


LR

N.P.D.

E-LONO.

NAS

N.P.D.

E-LONO,

FC

NP .D.

E.LONO.

BW

NP.De

E.LONO.

TI

NAP.D.

E.LONO.

OI

NAP.D.

E.LONO,

Al

NAP.D.

E.LONG,

=
Pa

125 90
38 «30

028.90
314.80

= 031.20
= 266.90

16.50
180-50

wa
se

=

21.70
16.80

wn
eg

COMMON SCALE MAGNETOGRAMS
BY STATION DAY
11 MARCH 1976

“prom

TTT TTT

\

TA sere pean

oye

\—_-—- 10
.
a etna ww VC
7
i. 6
t.
—
ee I en ord need cL
i}. 2
——— 1
! | {| | |_| {| 1 1 {| | 4 {| J 0
Oo U.T. 4 8 12 16 20 24
SCALE IS 250 GAMMAS PER CM

19


LR

NeP.D.

E.LONO.

NAS

NAP.D.
E.LONO.

FC

NAP.O.

E.LONO.

BW

NP .D.

E,LONO.

TI

NAP.0.

E.LONG.

OI

NP.D.

E.LONG.

tH)

026.90
338.30

(mH)
028.90
314.80

coy

131.20
65.90

wo
Reo

= 016.50
= 080.50

021.70
018.80

COMMON SCALE MAGNETOGRAMS

BY STATION DAY

24 MARCH

1976

TTT TT TT

[mr
ch
pe 10
i—+— 9
bp ~~—} -*
—}— 7
i—— 6
—. 5
—— 4
—j—. 3
Pl 2
i—j— 1
{| | 4 | Ltt {J | L °
oO UT. 4 8 12 16 20 24
SCALE IS 250 GAMMAS PER CM

32


NAS

NeP.D.

E.LONG.

FC

NAP.D.

E-LONG.

BW

NAP.D.

E.LONG.

TI

NP.De

E.LONG.

Al

N.P.D.

E.LONG,

018.50
129.00

021.70
018.80

COMMON SCALE MAGNETGGRANS

BY STATIGN DAY
6 MARCH 1976

ch

i—— 10

—+— 9

cee cand aeainas einen eee | i

17

j—|— 6

|_| 5

—j— 4

|_| 3

Py] :

| 1

Ltd Ltt Ltt Lt Lt 0
oO U.T. 4 8 12 16 0 24

[SCALE IS 500 GAMMAS PER CM]

14




S$ Avo cin UW 9Z6T

ourt2o = osW
@ Ty

ooieo = “aw
@ 94

Baz0 = “ON
@) SUN

Osseo = “O'dW
@m yy

9L6T HOUWW
suolzelue\ Z - SWWYDOLANDWW 3TVIS NOWWOD


LR

NAP «Ds

LONG.

NAS

NP «De

E.LONG.

FC

N.P.O.

E.LONG,

Al

NP.D.

E.LONO.

na

018.50
129.00

016.50
080.50

021.70
018.80

COMMON SCALE MAGNETOGRAMS
BY STATIGN DAY

21 MARCH 1976
TTT TTT TTT TTT T
cenit remediate
i ene ee
ne aaa ee eee i
ee ee ee
ch
ji—— 10
i»
pe ep | ae)
po TT,
i—j+—. 6
5
—j 4
ls
mt
te
jefe A
|_| 4 { | | it Lt | 0
Oo UT. 4 8 12 16 20 24
SCALE IS 250 GAMMAS PER CM

29


COMMON SCALE MAGNETOGRAMS
BY STATION DAY
18 MARCH 1976

TTT TTT TTT TTT TT
NE COO SOR Laven en
LR oom adel rm)
N.P.D. = 025.90
E,LONG, = 338.30
NAS obey ype ap eanecemes naneanediinl eaten cal
N.P.D. = 028.90
E-LONG. = 314.60
fc @ Myo Jae}
Eitan. 2 268.90 ann enV es ee need
BW cH)
N.P.D. = 018.70 Aner
E.LONO, = 203.30 Wyn
TI ow
. ae
wes 7 ee ara,
ch
|\——— 10
Lange A en --*
om =f EN pT
N.P.0. = 016.50 oon Se]
E.LONG. = 080.50 6
. —|_ 5
—— 4
oe pit al | _L;
Al cm vl | Pw LE,
N.P.O. = 021.70
E-LONG. = 18.80 —+—1
[1 4 | | 4 | | 4 | | | 0

0 U.T.

SCALE IS

4

8 12
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 collocated 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-Terrestrial Physics, Report UAG-22.

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

C. C. ABSTON, and World Data Center A for Solar-Terrestrial Physies, Report UAG-29.

L. D. MORRIS

ALLEN, J. Hy. 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 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 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-Terrestrtal Physics, Report VAG-39.

L. D. MORRIS

ALLEN, J. H.5 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., 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.5 1976 Auroral Electrojet Magnetic Activity Indices AE(11) for 1974,

fr: 5 ABSTON, and World Data Center A for Solar-Terrestrial Physics, Report UAG-59.

. 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 WDC-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 (20s for BU) 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 i-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. 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 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 40) and the figures based upon minute-to-
minute "frequency of index provision" by each station. Also given in this report 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 STATION DAY

7° MARCH 1976
rrry?tgetytrrtytttytrtty ttt
LR ow na sas adn nates eee eens
Econo. = 390.80
NAS «wp beeen |
wip.0. = 020.90 0 pA
E.LON, = 314.80
Fo PW nah ley ymin | he |
ETLOND, = 286.80 pooner Tah re
BW «Hh
N.P.D. = 018.70 eT ya gl
E.LONG. = 203.30

TI ne ee
N.P.O. = 018.50
E,LONG. = 129.00 Nye
cH
| 10
DI cw yaa eed eee |»
N.P.D. = 016.50 i—— 8
Coma. 2 aes ae ye
te |
5 H
jf 4
Al a Poet ee tt
eg, 2 a ae TT,
i—j— 1
Ltt tt tp ft tt tp pt tp tt 0
oO UT. 4 8 12 16 20 24
(SCALE IS 500 CAMMAS PER CM]

15



oust = saan
a) omg

gates = "Osh
oo 94

e820 = "Ord N
O) SUN

osrsa0 = "OdW
ay



COMMON SCALE MAGNETOGRAMS
BY STATION DAY
13° MARCH 1976

TTT PT TT Ty TTT yr TT

: TTT TTT
LR ow
N.P.D. 2 oas.80 ee
E.LONG. = 338.30
NAS cH Joa pm
= Leryn nL ey
ite, Wit nee
FC tx Re ee ea
gst BER Ons + nel
berry |

on

BW iin Lm srl
N.P.D. 018-70 pate bene)
E.LONG, = 203.30

TI ¢

NeP.D. =
E,LONO, = 129.00

=

018.50

Naan
i—— 10
i—|— 9
DI ow frags amen
hep pe 16-50 Key op ee Fane
E.LONG. = 080.50 |
|\—_}+_ 6
—j— 5
= eee
Al oom Pe PN is
N.P.D. = 021.70
E.LONG, = 018.80 Mi | a
—
{| | | ff fp pet pp tt tt 0
O UT. 4 16 20 24

8 12
SCALE 15 250 GAMMAS PER CM
21


WORLD DATA CENTER A
for

Solar-Terrestrial Physics

REPORT UAG - 63

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

September 1977

IMS DATA PUBLICATION NO. 3



AURORAL ELECTROJET MAG INDICES AE(7) wm» AURORAL ELECTROJET MAG INDICES AE(7)

AU

‘ |
saw vl te
AL AL

wel 76/03/21 | ba r6/03/22 |
‘
Pe)
‘ 1 hal rl lal : 1 test
Ao Ao
ea on
|
ww AURORAL ELECTROJET MAG INDICES AE(7) nw» AURORAL ELECTROJE: G_INDICES AE(7)
AU AU
om ‘s
te i PRA : re =
Sou haw
AL AL
om ‘0
r6/03/23 | Z esosvea |
vm ow
AE AE
oy um
‘ ‘
o o
" iF "
t LA Lf] 1 ht
sf op st
AO AO
‘0 ‘ a
wm AURORAL ELECTROJET MAG INDICES AE(7) ww AURORAL ELECTROJET MAG INDICES AE(7)
AU AU
a
rn ‘, Pay
a * bens \
" i 0 etl ri
t : ry
ta son f pee
aL | i
0
16/03/25 bl 76/03/26 | .
0
AE
7 ‘i
t NL Ley PW
sf pen]
Ao uf! a ‘|

44



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 (£. 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, for example, 2-3 March 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.



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SECTION III. PRELIMINARY AE(7) INDICES, MARCH 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 on 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
LGM [Allen and Kroehl, 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 53) 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 54-57) 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 1l-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

(Text continued on page 46)

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

ww AURORAL ELECTROJET MAG INDICES AE(7) vw AURORAL ELECTROJET MAG INDICES AE(7)
fa Mh lh m fd rl
ype wana rH A
vi
7 “ |
AE AE
” me Ni
My iM)
A rh K4 r
th ak hi vo) MN ad sal pal D  hdawl i
aol TT i ¥ Ao ‘ani
” 4 wl 1 ¥

40



LR

NAP .D.

E.Lono,

NAS

NAP .D.

E-LONo.

Al

N.P.O.

E.LONG.

026.90
338.30

028.90
314.60

031.20
266.90

=

= 018-70
= 203.30

=

018.50
129.00

wn

=

016.50
080.50

=

21.70
16.60

eg

wo

COMMON SCALE MAGNETGGRAMS

BY STATION DAY

20 MARCH

1976

TTT TTT I

eae an, coememmecencten at ocean lee arene aac aie

TT

Se a ne cece eae Nal

Lt | | !

oO UAT.

SCALE IS

4 8 12
250 GAMMAS PER CM
28

16


wm AURORAL ELECTROJ INDICES AE(7) w» AURORAL ELECTROJET MAG INDICES AE(7)
AU AU
7 | | -
« ji Lode lath : fect LA |
i nl fra PAN ol Oey aap ee cy tc]
Seu San
AL AL
sm || am
rero3/27_| mT 76703728 |
wn vs
AE AE
oo 4 se
‘ ‘
7 nH
: I W ® ba
PRAT D i UNEP Co
a0 MAN i M4 ao | | 4
a 1 o z|

AURORAL ELECTROJET MAG INDICES AE(7)

ww wo
au
” | |
Pe acne o ct Neha spa
nt ky F al Pah
: pf MTT hai Fi
0
AL
76/03/29 * 76/03/30 _|
oy v0
AE AE
ww i
m0 F tm
tO LLL ed © hdd dd
Ao Ao M] |
m TM 7

AURORAL ELECTROJET MAG INDICES AE(7)

76/03/31

45



LR

NAP.D.

E.LONo,

NAS

NP.De

E.LONO.

FC

NeP.D.

E.LONG.

BW

N.P.0.
E-LONO.

Al

NeP.D.

E.LONG,

g

=

025.90
338.30

026.90
314.80

031.20
265.90

018.70
203.30

021.70
018.80

COMMON SCALE MAGNETGGRAMS
BY STATION DAY
19 MARCH 1976

5
:

|_| 1

iGueenemnaeniadn A. occmeecoemnmiatdion Aimee |

|_| |_| 1 | | J |_|

—

a=

cn
|—— 10

7

i 2

oO UT.

SCALE IS

4

8 12
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
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 original centimeter scale reproduced at lower right. For each station
the North Polar Distance (N.P.D.) and East Longitude (E. Long.) are given.



LR

NP .D.
LONG.

NAS

NAP .D.
E,LONG,

FC

NAP.D.
E,LONG,

BW

NP sD.
E.LONO.

TL
N.P.D.
E.LONG,

OI

NP .De
E.LONG,

AI

N.P.D.
E,LONO,

(H)

= 021.70
= 018.80

COMMON SCALE MAGNETOGRAMS

BY STATION DAY

10 MARCH

1976

|

ee

| | 4 |

Le
heptane fanny

ay
me,

[|_| !

Oo UT.

SCALE IS

4

8 12
250 GAMMAS PER CM
18

16


LI rs)
x

® i
7 =
x

4 3
y =
7)

r] <
1 | iS
a any
oS oS

=

aoe

3

=
a
‘

6

+

+



COMMON SCALE MAGNETOGRAMS
BY STATION DAY
27 MARCH 1976

fT TT TTT TTT TTT TTT

natin ren
LR oom ee Ww,
N.P.D. = 026.90 mal a
E.LONG, = 338.30
NAS wm tpn!
u.p.o. = 020.90 | ae en eal [
E.LONG, = 314.90
FC om fe nw on ei
lane. 2 Seco yo wae
BW ow
NeP.D. = Lee
€.LONG. =

TI wm Lee ee
N.P.D. 018.50
E.LONG, 129.00

019.70 een ahead
ine

NAP.D.
E.LONO.

Al om hey

NAP .D.
E.LONO.

oUt. 4 8 12
(SCALE IS 500 GAMMAS PER CM]
35



COMMGN SCALE MAGNETGGRAMS
BY STATION DAY
28 MARCH 1976

veal
LR ow

NeP.O. =
E.LONO, = 338.30

Leryn Learn an]
Nason fe" wo

N.P.D. = 028.90

E.LONG. = 314.80

E.LONo.

ro. estan ona i ais

BW cw
N.P.D. " 018.70 Wear bal imtannn

E-LONO. = 203.30

+ = 018.50
E,LONG, = 129.00

OI wm

N.P.O. = 0
E.LONO. = 080.50

peraeeiemncane baenMipadaneaea scemeatnes ae
oe nf |
NP.D. 21.70

Exons. = o1s.80 | | | | { | Lt | | 4 |_|

RVs as, oe

Oo U.T. 4

8 12
SCALE IS 250 GAMMAS PER CM
36


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COMMON SCALE MAGNETOGRAMS
BY STATION DAY
16 MARCH 1976

LR oun

N.P.D. = 025.90
E.LONO. =

FC ww
ia, 2 get-go es aan anaes aan
Layapr-n?

BW om

N-P.D. = 018.70 poy
E.LONG, = 203.30

|

DI ow | niet Ane arson] tog
N-P.O. = 016.50
E,LONO, = 080.50 | 6

TT OT aly
AL an [penn ree poy | 8
N.P.D. = 021.70 —- 2
E.LONG, = 018.80
ji—_+— 1
{|_| J || 4 | | | | | |_| 4 { | | o
Oo UT. 16 20 24

4 8 12
SCALE IS 250 GAMMAS PER CM
24


3
;

ss A



SECTION

oO FR wR

SECTION
1.
2.

SECTION

TABLE OF CONTENTS

Page
I: GENERAL DISCUSSION
Introduction. 2... ee ee 1
Data Selection and Processing ...............00. see 1
Auroral Electrojet Magnetic Activity Indices 2... .. . 2
Acknowledgments 2... . ee 3
References... ee ee ee see 3
II: COMMON SCALE MAGNETOGRAMS
Stacked Common Scale Magnetograms for Whole Month (H, Z, and D Variations) . . 4
Stacked Common Scale Magnetograms by Station Day (H Variations). ...... 8
III: PRELIMINARY AE(7) INDICES, MARCH 1976
Discussion of Graphs, Tables, and Statistical Information .......,,., 40
Graphs of AU, AL, AE, and AO for Each Day of the Month... 2... 40
Tables of AE, AO, AU, and AL Indices... ..... eae 47
Tables of Observatories Supplying Hourly AUand AL. 2... ee 51
Statistical Information... . ee ee 53

ii



AURORAL ELECTROJET MAG INDICES AE(7) wy AURORAL ELECTROJET MAG INDICES AE(7)

au au
” =
}~ LL anon Li
" CTR ny jn , ae iy Lam
ou ' || Sou
AL AL
2
76/03/15 | 316 |

AE

a \
TAT Ms LN

so iY

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

au AU
” a
: Le ht ty heats ht fb)
" art 1h ry rr
Sau MA hl bon
AL AL
a a
al |
76/03/17 | wal 76/03/18
‘0
AE
‘
n ‘wo 1
M hap} ci cl ‘ YY | Inf Ladd] MI
M Ao vy]
ea Ly
AURORAL ELECTROJET MAG INDICES AE(7) ww AURORAL ELECTROJET MAG INDICES AE(7)
0
AU AU
” | | TM
H La aa 14 ", L4 hu
st ony " mataas
2a EL PP in i"
aL AL
aww |
76/03/19 an {76703720 |
ww wo
AE AE
um ‘Mt
i :
Py 7
CALLAMATILAAP LL TLLLLU ALAM
ho ay Ly lay ho
a a ” 7 a

43



w AURORAL ELECTROJET MAG INDICES AE(7) AURORAL ELECTROJET MAG INDICES AE(7)

Au AU
Aare Penn eeeraneenen ‘AA i. se
Fa ald ; “on he i

76/03/03

r6r03/0a |

ert NA al 0 aa
a ald vr a
mm AURORAL_ELECTROJET MAG INDICES AE(7) im AURORAL ELECTROJET MAG INDICES AE(7)
AU AU
w -
Ant a! By pa tadnt taht
pl jal pesccesn
ry al DYE
|
AL
a
6/03/08 | bd reso3v06 | >
0 w
AE AE
‘t Ps A
‘
‘a | \ ‘aw
t wacddas lat yi
'
ho ' ao] | a ‘a
= z| a z|
ww AURORAL ELECTROJET MAG INDICES AE(7) vw AURORAL ELECTROJET MAG INDICES AE(7)
AU
7
A Lea WAbec MEA Leland + LAA Lat ry
MTT RCN IA H a)
saul
wach? a
ww
76/03/07 _| * 76/03/08 |
Ps wo
AE AE
ot) we +
: H ay PUAN M
few Saw
: AL Me : Waa ce, \
st id st
A |
‘she Th ‘sh ry

4l



COMMON SCALE MAGNETOGRAMS
BY STATION DAY
3 > MARCH 1976

LR oa et ee ee Oe alae
N.P.D. = 025.90 hye
E.LONG, = 338.30

NAS cH ba patron er ee

Eitowe. = $14.80 [er

FC «x |
. Pann pe | petite yt PANN) i]

EcLONG. = 268-80 pn

BW cH
eae Me edn a eee ad ee

|
|
|

= 018.50
E,LONG. = 129.00

|—— 10

i 9

8
N.P.O. = 016.50 7
E.LONG, = 080.50 a

Ww]
Dw ear ana
p=" NI

Leet nether
Al om

NeP.D. = 021.70

E.LONG. = 018.80

{of jf tt ttt tt tp tt tp yp tt 0
o_U.T.

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

11 |



2zgtt v
£609 10
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186 na
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OS6TT SwN
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9L6T YO4eN uo13e3s
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OgL 602 86S hee ett ¢ a a2 92 ram oT nd £e mnt £62 62 £2 e s et Te 69t eh
4 9 AT OOET «SOT STZ oe Tse eh fen] och 64T 92 86 26 TH 6f 92 2 OF § 8 98
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so Ss 22 28 89 982 TSH nse [HHO] seoT soe S22 SHO £95 TOH 222 ZIT £9 O 22 £2 £ @ ZF
fte 202 642 O0f HT2 S82 9h2 z26T BOT T9 Ch Ss OFZ z2te TSS ESe sor nent SHH eset c2tt ge0t eee 029
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tee 205 sCt 2€ ef 28 fht Tst SL 92 St 6T S2 62 2F ft 69 NZ SOS 08 T26 696
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fun "6 TL 6 0 4 @ gt 62 TOT 9 96 Eft OTT GS TE OT 60T THe 9£9 ete [EST Ose 2s
eet £2 at2 fff see ze [9S8} StL 52 26T Let 95 Gh GE O6T 9Hz 66 TIT Bf 2 £2 ODO D He
nz £2 22 2 02 6t BF st OF St Ht ft 2b TF OF 60 80 20 90 $9 0 9 20 To
9L6T YO4RH
suolangliquog Ty pue py Jo Kouanbauy uolgeas “2 ALdeL

‘Voryeuosuy TeOTISTIeAS

Iv
Iv

10
Ia

IL
IL

ne
Me

94
od

SUN
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-ay

“Ww
“nv

-W
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g

53


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LR

NeP.D.

E,LONG,

NAS

NP.De

E.LONG.

FC

NP.De

E.LONG.

BW

NeP.D.

E.LONG,

Al

N«P.De

E.LONG.

oy

026.90
314.80

031.20
265.90

021.70
018.80

COMMON SCALE MAGNETOGRAMS

BY STATION DAY

5 MARCH 1976
TTT TT TTT TT TT

EERO og nese linaeeadieeal eemmmemnedl (ennamtivens wai \Vcan
Poy fe oes eens in aie
nn ee on Ona 0 on eee es ea
pT ee

ch

| 10

|_| 3

ooued eeeeeee etnea | hence TL,

reViie

——6&

i—_ §

jit 4

Pipe ALE!

|} 2

i—+— 1

{1 | {14 Lt {14 °
o U.T. 4 8 12 16 20 24

[SCALE IS 500 GAMMAS PER CM]

13


WORLD DATA CENTER A

for
Solar-Terrestrial Physics

REPORT UAG - 63

GEOMAGNETIC DATA FOR MARCH 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 WW
Solar-Terrestrial Physics, NOAA, Boulder, Colorado
and printed by BZ

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NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION Li

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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 MARCH 1976

TTT

LR

N.P.O. = 025.90

E-LONG. = 338.30

NAS ww

ne.o. = 020.99 [7 fw PN
E.LONG. = 314.860

FC wm

rs: eS PY ae

BW om |_--/}

N.P.0. = 018.70 hey Tw
= 2

E.LONG.

AI m

NAP .D.
E.LONG,

sae yet pur
| | J

J} 4 | jt {ji |_|
out. 4 8 12 18
[SCALE IS 500 GAMMAS PER Cm]

34


COMMGN SCALE MAGNETOGRAMS
BY STATION DAY
14 MARCH 1976

TTT TTT TTT TTT I T
LR om or Le elven rnrnllnrl
N.P.D. = 025.90 Na |
E.LONG. = 338.30
NAS cw
nn
N.P.D. = 028.90 My enn JA ren rn
E.LONG, = 914.80 AL
FC ux
+P.D. = 031.4! eee ee ets eecencede ate ieee
ELONG. = 265.90 Spry
BW om cee aa Na v
N.P.O. = 018.70 Wy
E.LONG. = 203.30
TI om ~~ hme
N.P.D. = 018.50
E.LONG. = 129.00
ch
—— 10
i\—— 9
DI ow mage apne Jnana | *
N.P.0. = 016.60 Wns j—|7
E,LONG. = 080.50
| 6
ij 5
\—+— 4
Al cw fon [ry
N.P.D. = 021.70 a waeel
E,LONG, = 016.80 jl
1
|_| 4 | | 4 {| | | | | 4 | L °

OUT.
SCALE IS

4

8 12
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:

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Coordination Office

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

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Notes:

Rotation of the Earth:

World Data Center A:

Rotation of the Earth
U.S. Naval Observatory
Washington, D.C., U.S.A. 20390
[Telephone: (202) 254-4023]

Solar-Terrestrial Physics (Solar and

Interplanetary Phenomena, Ionospheric
Phenomena, Flare-Associated Events,
Geomagnetic Variations, Magnetospheric
and Interplanetary Magnetic Phenomena,
Aurora, Cosmic Rays, Airglow):

World Data Center A

for Solar-Terrestrial Physics
Environmental Data Service, NOAA
Boulder, Colorado, U.S.A. 80302
[Telephone: (303) 499-1000, Ext. 6467

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Tsunamis, Gravimetry, Earth Tides,
Recent Movements of the Earth's
Crust, Magnetic Measurements,
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for Solid-Earth Geophysics
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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)

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 amp] itudes
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.

46

4
|
|
i



COMMGN SCALE MAGNETGGRAMS
BY STATION DAY

22 MARCH 1976
La ee ae a a ee
LR oa
N.P.D. = 025.90
E.LONG, = 338.30
NAS «mn
N.P.D. = 028.90
E.LONG, = 314.80
FC
N.P.0. = 031.20 1.
E.LONG. = 265.90
BW «wm
N.P.O. = 018-70 When
E.LONO, = 203.30
TI ow
N.P.0. = 018.50
E.LONO. = 129.00
ch
——
i—+_. 9 if
DI tw -* |
N.P.D. = 016.50 — |
E-LONG. = 080.50
| 6 |
oon
4
Al am --*
N.P.O. = 021.70 —— 2
E.LONG, = 16.80 al
LJ | {| 1 4 | tet [Lt | 1 1 | itt °
oO U.T. 4 8 12 16 20 24
SCALE IS 250 GAMMAS PER CM

30


COMMON SCALE MAGNETOGRAMS
BY STATION DAY
31 MARCH 1976

TTT? TTT) Tet Pt tt yt ot
LR ow fe rN
N.P.D. = 025.90 wae
ELON. = 336.30
NAS op
N.P.O. = 028.90 Canela ee ne ia
E.LONG. = 314.80
FO ux VN
“P.O. = 0316 a
EsLowo. 2268-90 Retain acdaendl\ Ca tealins Co nee

BM. . 018.70 pen mh L pry ee

E-LONG. = 203.30

TI wm eee macommemnel Deena aoa
N.P.O. = 018.50 per

E.LONG.

DI ow ae eres ene aaa
N.P.O. = 016.50
E.-LONG, = 080.50

Al am ee en ed es

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

Pj |] jt} tt tt | tt} tp tp tet

oO OU.T. 4

8 12
SCALE IS 25C GAMMAS PER CM
39


NAS

NAP.D.

E,LONG.

FC

NAP .D.

E.LONG.

BW

NP .D.

LONG.

N.P.D.

E.LONG.

OI

NP.D.

E.LONO.

Al

NP sD.

E.LONG.

018.70
203.30

COMMON SCALE MAGNETGGRAMS

BY STATION DAY
17° MARCH 1976
TTT TTT TTT TTT
harper nan Ar IN |

yo

{_| J | jt || 4

|—— 10

oO UT. 4 8

12
SCALE IS 250 GAMMAS PER CM

25


BW

N.P.D.

E.LONG,

TI

N.P.D.

E.LONG,

DI

NPD.

E-LONG,

Al

NaP.De

E,LONG.

=

18.50
29.00

=o

COMMON SCALE MAGNETOGRAMS
BY STATION DAY

1) MARCH

1976

PTT Te

| | 4 {| 4 |

{pe ett NN

| | |

a

|_J

0 UTe

SCALE IS

4

8 12
250 GAMMAS PER CM
9

16 20
NGSDC (BOULDER)

77/06/08

24



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49


COMMON SCALE MAGNETOGRAMS
BY STATION DAY
4 MARCH 1976

a ee

aeetaeepetamae ia (loner a aaa eae can erines ied ent eran! No
LR om

N.P.D.
E.LONG.

NeP.D. =
E.LONG, = 314.80

FC «
wrede, 2 $8bz2 RNA 0 aaa Aaeeeind ek nodes omnes

NAS cn ; NN ged TN fat aa

|
|

TI ow ane nan aa nnn
N.P.D. = 018.50 Tr
E,LONG,

ji——— 10
i—+— 9
Yarra vette nV pal ia | os
DI om aaa ,
N.P.O. = 016.50 Py
E.LONG. = 080.50 —6
i—— 5
i —}— 4
[fn ft |
| 3
Al oan >
N.P.D. = 021.70 y
E.LONG. = 018.80 i—j— 1
| | | {| | J {| {| | | | 4 |_| {|_| 0

oO U.T. 4

8 12
SCALE IS 250 GAMMAS PER CM
12