UNITED STATES DEPARTMENT OF THE INTERIOR -...
Transcript of UNITED STATES DEPARTMENT OF THE INTERIOR -...
UNITED STATES DEPARTMENT OF THE INTERIOR
GEOLOGICAL SURVEY
PRELIMINARY GEOMAGNETIC DATA COLLEGE OBSERVATORY
FAIRBANKS, ALASKA
v FEBRUARY 1984 OPEN FILE REPORT 84-O3OOB
T H I S REPORT WAS PREPARED UNDER THE D I R E C T I O N O F JOHN B , TOWNSHEND, C H I E F OF THE C O L L E G E OBSERVATORY, W I T H THE ASSISTANCE OF THE OBSERVATORY STAFF MEMBERS: J n E , PAPP, E I A , SAUTER, L I Y n TORRENCE, P n A , F R A N K L I N AND I N COOPERATION W I T H THE GEOPHYSICAL I N S T I T U T E OF THE U N I V E R S I T Y OF A L A S K A , THE C O L L E G E OBSERVATORY I S A PART OF THE BRANCH OF GLOBAL SEISMOLOGY AND GEOMAGNETISM OF THE UaSn GEOLOGICAL SURVEY 1
Explanation of Data and Repurts
Magnetic Activity Report
Outstanding Magnetic E f f e c t s
P r i n c i p a l Magnetic Storms
Preliminary Calibration Data and Monthly Mean Absolute Values
Magnetogram Hourly Scalings
Sample For11,at for Normal and Storm hhgnctoerxams
Normal Magnetograms
Storm Magnetograms (When Normal is too disturbed to read )
Ul l FGF OBSFRVATOSY PRFI IMIPlASY GFOMAGNFTIC DATA
W I A N A T I O N OF DATA AND REPORTS
INTRODUCTION OBSERVATORY LOCATION
The preliminary geomagnetic data included here is m a e avai iable t o s c i e n t i f i c personnel and organizations as ? a r t of a cooperative e f f o r t and on 2 6ata exchange bas is because of the ear ly need by some users. To avoid delay, a l l of the data i s copied from o-iginal f o m s processed a t the observatory; therefore it should be regarded as preliminary. Inquir ies about t h i s report o r about t he College Observatory should be addressed to:
Chief, College Observatory U.S. Geological Survey 800 Yukon Drive Fairbanks, Alaska 99'701
Requests f o r copies of the magnetograms except f o r the current month should be addressed to :
Yiorld h t a Center A NOAA D63, 325 Broadway Boulder, Colorado 80303
GEOMAGNETIC DATA
Normal, Storm and Rapid Run magnetogrms and approsr ia te ca l ib ra t ion data a r e processed da i ly a t the observatory and a r e ava i l ab l e f o r analys is or copying. Also available, a r e mean hourly scalings, K-Indices, se lec ted magnetic phenomena repor ts and on a r e a l - t h e bas is a r e recordings from a 3-compo- nent f luxgate magnetometer and F-component proton mgnetometer.
The College Observatory, operated by the U.S. Geological Survey, i s located a t the University of Alaska, Fairbanks, Alaska. It i s near the Auroral Zone and the northern l i m i t of the w r l d ' s g rea t e s t earthquake b e l t , the circum-Pacific Seismic b e l t . Although the observatory's basic operation i s i n geo- magnetism and seismology, it cooperates wLth other s c i e n t i s t s and organizations i n areas where the f a c i l - i t y and personnel can be of service.
The observatory is one of three operated by the USGS i n Alaslg. The o thers a r e located a t Barrow and Si tka .
The pos i t ion of the observatory s i t e i s : Geographic l a t i t u d e ....... 64'51.6'N Geographic longitude. . . . . -1Z')O 50.2'W Geomagnetic l a t i t ude . . . . . .+64.@ Geomagnetic longitude .....* 256.43 Elevation ................. 200 meters
:Eagne?ic Act iv i ty The K-Index: The K-Index is a logarithmic measure-
ment of the ranne of the most disturbed comwnent (D or H ) of the geomagnetic f i e l d f o r e ight in tervals beginning O00QO300, 0300-0600.. .2100-2400 UT. I t i s a measure of the dif ference between the highest and lowest deviation from a smooth curve t o be emected f o r a comuonent on a magnetically quie t day, within a ti-ree hour in t e rva l .
The Equivalent h i l y Amplitude, AX: The K-Index i s converted i n t o an equivalent range, ak, which i s near the cen te r of the 1imitir.q gamma ranges f o r a given K. The average of the eight values i s ca l led equivalent d a i l y amplitude AK. The u n i t 10Y has been chosen so a s r,ot to give the i l l u s ion of an accuracy not j u s t i f i ed .
The schedule for converting gamma range to K , and K t o a k i s a s follows:
Gsmmn Range K - Index - ak O < 25 0 0
3 7
15 27 48 80
110 2L 0 LOO (ICY)
The Mafpetic Daily Character Figure, C: To each Universal day a character i s assigned on the bas is C=O, i f it is quie t ; C = l , i f it i s moderately disturbed; C=2, i f i t is g rea t ly disturbed. The method used t o assign characters a t the College Observatory is based on AX a s follows:
AK Range C 0-11 Ti
11-50 1 5Dc 2
Routine assignment of C was discontinued a t College on January 1, 1976.
Selected Phenomena & Outs t and lz ?Aagnetic Effec ts R i o r t o January 1, lW6, the Normal and Rapid
Run records were reviewed a t the observatory fo r selected magnetic phenomena and the events i den t i f i ed were forwarded t o the IUGG Gomission on Magnetic Variations and Disturbances. This was discontinued on January 1, 1976, but a report on Outstanding Ehgnetic Effec ts i s prepared monthly f o r t h i s repor t .
Pr inc ipal Magnetic Storns Gradual and sudden commencement magnetic d i s tu r -
bances with a t l e a s t one K-Index of 5 or grea ter , which a r e believed to be par t of a world-wide disturbance. a r e c l a s s i f i ed as pr inc ipal magnetic storms. The time of the storm beginning and ending; d i rec t ion and amplitude of sudden commencements; period of maximum a c t i v i t y ; and storm range a re reported. Monthly repor ts of these data a r e forwarded t o the World Data Center A i n Zoulder, Colorado.
Magnetogram Hourly Scaling's Magnetogram hourly scalings a r e averages f o r
successive periods of one hour fo r the D, H and Z elements. The Value i n the column headed "01" is the average fo r t he hour beginning 0000 and ending 0100. Note t h a t the values on the scaling sheets a r e i n tenths of rnm with the decimal point srnizted. The user of these sca l ings should keep in mind tha t the tabular values a r e hourly means and i f he i s interested i n the deta i led morphology of the magnetic f i e l d , he should r e f e r d i r e c t l y to the magnetograms.
k ~ e t o g r a m s The normal magnetograms in t h i s report a r e repro-
duced a t about oneIthird the s i ze of the or ig inals . Preliminary base-line values and sca le values adopted fo r use with the o r ig ina l magnetograms a re included. For days when the magnetic f i e l d i s too i i s turbed fo r t he Normal magnetogram t o be readable, Storm mgnetograms a r e reproduced.
Absolutes, Base-lines and Scale Values To determine the absolute value of the magnetic
f i e l d from the hourly means or from point scalings t he following equations should be used:
D=EL,+d.SD; H=++h*%; Z=B '2-3 whehe D, H and 2 a re absofute values; $, BH and BZ a r e base-line values; SD, % and SZ a r e sca le values; and d , h and z a r e scalings i n mill imeters.
U. S. DEPARTMENT OF COMMERCE ijuAA 76-133 NATIONAL OCEANIC AND ATMOSPHERIC ADMlNlSTRATlON (9-72)
MAGNET lC ACT l V l T Y (Greenwich c iv i l t imr, countad from midnight to midnight)
I K-INDICES
OBSERVATORY
COLLEGE, ALASKA
I TIME SCALE ON MAGNETOGRAMS
SUDDEN COMMENCEMENTS
24 1 d 16 h m
POSSIBLE SOLAR-FLARE EFFECTS BASED ON
INSPECTION OF GRAMS ALONE (WITHOUT
R E F E R E N C E T O D A T A FROM OTHER SOURCES)
16 1 d
APPROVED JOHN B. TOWNSiXEND, CHIEF, COLLEGE OBSERVATORY
O B S E R V E R I N CHARGE
N O A A FORM 70- is* SUPERSEDES c a t s FORM a t 5 * U.S. GOVERNMENT PRINTING OFFICE: 1973.761-847
K S C A L E USED:
LOWER LIMIT FOR K = 9.. . . . . . . . CURRENT SCALE VALUE... . . . . .
LOWER LIMIT FOR K = 9 ... .. .. .
B E G IN
d 11 m
END
d h r n
SCA L I N G S AND COMPUTATIOHS HAVE BEEN CHECKED.
D
675.7 3.72
2510
X H
322.2 7.76
2500
(rnm
(Y/rnm)
(to nearest 10Y)
Data from Individual Observatories: PRINCIPAL MAGNETIC STORMS
COLLEGE OBSERVATORY, COLLEGE, ALASKA February 19 - 8d
I I
WDC-A FOR BOUR-TCRRE.TRlAL C W Y S I W L N V l l l O N M l N T A L DATA S IRVICE, NOAA 8OULDEII. COLORADO 10101 U .S.A.
Ranges UT End SC - I
I D(') I
. .
. .
P1.x.
day
04 05
14
amplitudes
H(Y)
I .
. I
Z(Y)
a +
I .
3 hr - index K
( 3 hr - period)
3 , 5 , 6 4
5
K
6 6
7
COLLECE O E E R Y A T ~ , c o w , W K A -- PFELIWXAKY C ~ O R DATA FOR: FEBRUARY 198y
RORHAt NkCNETOCRAPB
COMPCmErn
D
H
CALlBRATION 'PERI(ID'
2
B A S E m
37" /&.'9 &C
/a657 d
FRLW
0000 ~ , 7 , 2 -/-By
00- U.7, 2 -/-BY
SCAZE V A U E TO
2400 0.z 2 - 2 9 - B y
#OO U.7 9&2?- By
/. L / M ~
dm0 u.Z. 2 -i-Sr/
3.7~/m?
s m MAGRETOG-
78 ~/h@
U.T. 2-)9-BL/
C m P c m m
D
H
z
7;G ~ /m&
CALIBRATIDlO
55/83 f
PeRfM,
WID RUlP H A G m R A P B
BASELIRE
d Y 0 2 % k ~
/0770 Y
&40?s,
FROH
aom 12.7; 3 -/-BY
P b m U.T,, - 2 --/-8q
0066 v.7: 3 -/-BY ,
SCAIE VMBE
c(13PONEm
D
B
z
M
dyob 0. T, - 2 -211-8q
~ Y Q O C1.q 2 -2 9- 84'
9400 o . ~ 3 -a-BL/
?P/mm dS!&f/m&
MmTHIx MEAN ABS0U.m VAUlEs*
D H Z
/ s ? a ~ 5 5 3 6 L b-= * C ~ D F R ~ Z E f l Q ~ T ~ W J R T R ; ~ .
nNs usell: m - 6 - 7 - B - 7 , /=z 1 , /7 , /Y , - a0 22
43, ? y/k&
Y8,o 6/m
CALTBRATIW
SCAIE v m mXOD
ma4 TO
1
1 )
1
021320 1327 320 172 2q2
01 -
a 3 6 7 3f3
303 274 283 199
p , . ~ l ~ l . . ~
158 1391 240 1207
293 309
303 302 303
194 I
3118 327 2112
0s - 316 380 2%
318 297 321
238 308 370
233 329
289
3/3 297 311
280 300
c...-;I~.
=
Pa
)O
1 1
3/7 328 / ~ 7
lOMrHCY YE** 1 3 3 ~ O'T's r 'rM On-
btrr..l Bs~e-l ime 5c. te rJ Sigailic.at ponim d d ~.gneii.c rt-
Begiaaial Y n l u V.ilr b m imrerpohwd. <> m e e d di *hc.t fa p n
No record; or a- r.lut* = d l d b a n . il v . 1 ~ i*
m-nikbk * m u * d I... c m r * m .nti-trd
6.1q n r d . fa .:.k# prr
* * r i * d LI S*m Map&., e n - 4 R-l Ygl.
CnZCm LO OY
S*UU¶ MS. wnwro mv
N M C U L D .I
U A L C O **
320 181 19q 309 374 290 332 305 277 263
27-57 300
317 307 300 183 287 294
mnd
i
3rlG
303 380 1335
JEq £AS
ZfP
LYT
=303
300 n283
306 1.305
35Y 272
303 311
3q8 2r19
315
324' 306
291
306 291 317 175 301 293 398 2 6 0
286
3.92
2 8 9
302 282 190 311
280 302 268 300 256 284 J ~ o 366
300
376
256 296 167
281J 2 y7 293 206 39, 241 278
- 11
15
l a
14
297 267
3 0 , 30q 255
164
297
39.5
256 3 /8 300
3/5 306 303 309 1 0 1
1 2 0 246
3/8 3 ~ 7
m p r l . 5
-261/ g Y 172
3Yq 293 / 9 5 305
i s 2 2 0
4.393
298 367
301 306
2.54 166
a 9 2 8 8 288 383
311 303 2.YB 307 297
2 8 5 309
278 306 2GB 298 252 37L/ 351/ 317 277Y
3/2
m
11
310 2 ~ ? / 1 ~ ' % 7
330
E . 2 6 3
308 310
5183 296
3 0 Y
343 32% 306 299 213 289
387 = Y ~ L
331*411*3~/3 30032G
3071303 330
307
/46
3 0 7 3 0 3 ] 3 4 /
229
1 . 2 9 3
1 9 3 0 5
284 189
287
3YL/ 3 4 ~ 7 ~ 2 7 4
324 zzo 192 3 l l
238 174 3 0 5 298
202 1/59
2.33
303 297 3 C 380
352 260 322
332
26Y 234 310 41%
38'1' 3 s 30q 220 3 4 1 9 0
3 Y o
~5 273
337 33Y 218 334 306
317326 398 473
I i -IU..:
338
338 427 5Y3
a4
367
310
( ) he~po1.t-d Scaling ==.mi. kc.-c
328
421 381 303 3 0 1
2 9 7
x 3 0 o
355 46(CY 383
304 337
578*570Y&507*~9
33Y
307 334 3 ~ 7 316
2 7 0
277 152
317 331
197
5 0 9
5%
337 "350 468
272 287
2 3 Y 261 301 27.5
u o * m c y
316
*a8
363
3111
248 361 ZL/o
32 /
300 310 338 341 317 256
371 238
3261°a
317 1 (11
4/27
270 305 280
fa
29
M
11
3 L z 353 2q+"
338
353 372
364 352 504 359 352
28q 290
137
Q
O-I
lo
l1
3/6 513*531Y
3/1
323*363*@37 381
185-
307 363 3LI
280 332
333 358
310 "EL23
466
370 410
351 348
316
336 31-1
308
7587 790.4
854.3 A
333 291 180 %2
239 303 3 7
310
331 318 381
312
IGI 292
308 306
31q 350 329
2 7 Y
335 353
3q3
376 3q3 352
357 328
502
417 3q2
1587*3171
308 338
6 7 y 8 I 4
330 353 286
336
319 3 3 r l 360
468 ?48q1528
334 317
32q 310
l a
595'539*5/0
3/3 163 31y
703 307 306 376
333
350 391
313 369
349 713
L/33
387
29Y 35'0 Y13 379
318
3 ~ 3 ~ ~ 4 332 316
387 333
rr
l*
381 314 313
3/54' 28y 3 1 1
318
7/18 7919 7713
383 324
~ ~ ~ j ~ . 5 ~ 5 * 5 ~ * ~ * ~ 9 0 ) * . ~ 7 ~ * ~ ~ ~ y
311 338 313
YI I
I36
fiq2
J f / q '370 1
rum 133423/
418
3oq 368
339 341
348 664
350 413
313 31.6
360 3 5 5 298
333. 299
421
362
359
36lf 353 330 342
4 1 1 331
430 313
1 * h 1
1 * 1 3 ~
393
427 311
2f8 3Y4 323
31q
3 3 Y
318 3 s
&/8*4%
6 0 1 * ~ _ 3 6 1
347 37q 378 3q6 3.55
3/q
352 333 33L/ 331
"
3/4 308 311
2 G L
278
* d l / 390
330
311
*a/ 7 3 3
614
3 4 /
3/7 372 36I 3G1 373
365 382
420 .?30
246 383
3 1 1
3118
307
305
176
408 333
330
6.52
-317
388 378
349 279
33/ 344 348 279 301 408
309 296
384 262
390
310 377
3Jo
331 325
S 8 351
373137~\232 308 )182 12~0
/LV 386
199
31q
7 6 4 5 7802 : 79q5 7 Y 8 7 7320
301
322
344 417
331
370 332 337 372 400
3.40 380
311 1336 297 1331
345
5u593y4*373
331 289
3/5 322
307 2 l o
370 379
7615
76 1 9
374 278
33L 39/ 347 171
30 378
96
/90
303 301 289
290
3581358
2qc 321
217
306 280 296 238 296 230
8490 9001
7703 7369
3 - f ~ 451 390
448
346 1 q 1
L//o 751/*509 401
371
308 -390
3ft' 220
2q2 If34 372
209 274 22-3
8133
171
275-
7456 7 L 1 5
7338 750/ 77/9 87t9
737f 80l8
;2N
300 7636 7212
FEB 7.19E4 I I
FEB 8 1984
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