UNITED STATES DEPARTMENT OF THE INTERIOR

GEOLOGICAL SURVEY

PRELIMINARY GEOMAGNETIC DATA COLLEGE OBSERVATORY

FAIRBANKS, ALASKA

OPEN FILE REPORT 82-03OOL

T H I S REPORT WAS PREPARED UNDER THE DIRECTION O f JOHN Bm TOWNSHENDJ C H I E F OF THE COLLEGE OBSERVATORY* WITH THE ASSISTANCE OF THE OBSERVATORY STAFF MEMBERS: JaEa PAPP, € , A , SAUTER, L n Y , TORREPICE* T a K ; CUNNINGHAM AND I N COQPERATION WITH THE GEOPHYSICAL INSTITUTE OF THE U N I V E R S I T Y OF ALASKA, THE COLLEGE OBSERVATORY IS A PART OF THE BRANCH OF ELECTROMAGNETISM AND GEOMAGNETISM OF THE UBSm GEOLO- GICAL suuvEr,

ORD'EX OF CONTENTS

Explanation of Data and Reports

hhgnetic Ac t iv i ty Report

Outstanding Magnetic Effects \

Principal. Magnetic Storms

Prelimina~y Calibration Data and Monthly Mean Absolute Values

Magnetogram Hourly Scalings

Sample Format fo r Normal. and Storm Magnetograms

Normal Magnetograms

Storm lkgnetograrns (When Normal is too disturbed to read)

GO1 1 FGF OBS-NTPIARY GFOMAGNET1C BAT4

F 4 s

The preliminary geomagnetic data included here is rnade available t o s c i en t i f i c personnel and organizstions as part of a cooperative e f for t and on a data exchange basis because of the ear ly need by some users. To avoid delay, a l l of the data is copied from original forms processed a t the observatory; therefore it should be regarded as preliminary, Inquiries a b u t this report or about the College Observatory should be addressed to:

Chief, Callege Observatory U. S. Geological Survey 800 Yukon Drive Fairbanks, Alaska 99701

Requests for copies of the magnetograms except for the current month should be addressed to:

Norld Data C e n t e r A NOAA D63, 325 Broadway Boulder, Colorado 80303

GEOMAGNETIC DATA

Normal., Storm and Rapid Rum magnetograms and appropriate cal ibrat ion data a re processed dai ly st the observatory and axe available for analysis o r copyinq. Also available, are mean houxljr scalings, K-Indices, selected magnetic phenomena reports and on a real-time basis are recordings from a 3-compo- nent f l u g a t e magnetometer and F-component proton mgnetometer . Fhgnetic Activity

The K-Index: The K-Index is a logarithmic measure- ment of the rrnge of the mmdst disturbed component (D or H) of the geomagnetic field for eight intervals beginning 0000-0300, 0300-0600,.2100-2400 IJT. I t is a measure of the difference between the highest and Lowest deviation from a smooth curve t o be expected for s component on a magnetically quiet day, wfthin s three hour interval .

The Equivalent @fly Amplitude, AK: The K-Index f s converted i n to an equivalent range, ak, which is near the center of the lfmiting garmna ranges for a given K. The average of the eight values is called equivalent dai ly amplitude AK. The u n i t I@ has been chosen so as not t o give the i l l u s ion of an accuracy not jus t i f ied .

The schedule for converting gama range t o K, and K t o a k is ss follows:

K - Index 0

The hZegnet1e Daily Character Figure, C : To each Universal day a character is assigned on the basis C=0, if it is quiet; C = l , i f it 1s maderately disturbed; C=2p i f i t fs great ly disturbed. The method used to assign characters a t the College Observatory is based on AK as follows:

AK Range 0- It

11-50 : 1

50* 2

Routine assignment of C was discontinued st College on January 1, 1476.

OBSERVATORY L O C A T I O N

The College Observatory, operated by the U.S. Geological Survey, is Located a t the University of Alaska, Fairbanks, Alaska. It is near the Auroral Zone and the northern l i m i t of the world's greatest earthquake be l t , the circwn-Pacific Seismic 5elt. Although the observatory's basic operation i s i n geo- magnetism and seismalogy, i t cooperates with other s c i en t i s t s and organizations i n areas where the faeil- i t y and personnel can be of service.

The observatory is one of three opersted by the USGS i n Alaska. The others are located a t brraw and S i t l a .

The position of the observatory s i t e is: Geographic la t i tude. . . . . . .a03l. 6'N Geographic longitude.. . . . .U?50.2'W Geomagnetic la t i tude. . . . . .+U. @ Geomagne t ie longitude . . . . . +2 5 6 . 9 Elevation. ................200 meters

Selected Phenomena L Outstandfng Magnetic Effects Prior to January 1, 1976, %he Norm1 and Kapid

R u n records were reviewed st the observatory for selected mgnetic phenomena and the events ident i f ied were formrded t o the IUCC Commission on Magnetic Variations and Disturbances. T h i s m s discontinued on January 1, 1976, but a report on Outstanding Mgnetfc Effects is prepared monthly far this report.

Principsl Magnetic Storms Gradual m d sudden commencement magnet1 c d i s t u r -

bances with st leas t one K-Index of 5 or greater, which a re believed to be part of s world-w5de disturbance, are classified as principal mgnetic storms, The t ine of the storm beginning and end-; direct ion and amplitude of sudden comencements; period of maximum ac t iv i ty ; and storm range a r e reported. MonthLy reports of these data are forwarded to the World Data Center A i n &ulder, Colorado.

kgnetogram Hourly Scalings Mametomam hourl~ searims are averages for

successive of one hour-for the D, H and z elements. The Value i n the column headed "01" is the average for the hour beginning 0000 and ending 0100. Note that the values on the scaling sheets a r e in tenths of mm with t h e decimal point omitted. The user of these sealings should keep in mind tha t the tabular values a r e hourly means and i f he is interested in the detailed morphology of the magnetic f i e ld , he should re fe r d i rec t ly t o the magnetogrms.

Magnetograms The n o m l magnetograms in t h i s report are repro-

duced a t about one-thfrd the s i ze of the orlgfnals. Preliminary base-line values and scale values adopted f o r use d t h the original magnetograms are included. For days when the mgnetic f i e ld is too disturbed for the Normal maipetogram t o be readable, Storm magnetograms are reproduced.

Absolutes, Base-lines and Scale Values To determine the sbsolute value of the mgnetic

f i e ld from the hourly means or from point scalings the following equations should be used:

%, % and BZ are base-line values; SD, % and SZ are scale values; and d , h and z are scalings i n millimeters.

U. S. DEPARTMENT OF COMMERCE Mi)AA 'OR' 76-133 NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION (9-72) I

, DATE

OBSERVATORY

COLLEGE, ALASKA

MAGNETIC ACTIVITY (Greenwich civi l timm, counted from midnight to midnight)

-

K-INDICES TIME SCALE ON

n ID - m MAGNETOGRAMS - .- t

% % A 0 0 0 k c h b c c y - N SUM

AK 1 - 20 I n m h

0 0 2 l I 0 0 0 0 03 01 SUDDEN COMMENCEMEHTS

0 0 0 2 1 0 0 06 03 d h m

0 0 1 1 5 4 1 1 1 3 11 2 3 1 2 1 1 2 3 15 08 3 3 5 3 2 2 1 0 19 14

0 0 2 2 1 0 0 0 0 3 3 7 6 6 3 2 5 6 6 6 6 2 3 3 4 4 7 4 3 2 1 6 6 5 5 5 3

3 4 2 1 3 5 5 A 2 2 4 7 6 3 3 1 1 1 0 3 1 2 2 1 1 1 1 . 3 2 0 2 3 2 2 4 5 2 1 1 0

0 0 3 5 6 5 5 3 5 4 9 7 7 6 5 4 3 4 7 8 7 6 5 3 6 4 4 6 6 4 3 3

POSSIBLE SOLAR-F LARE EFFECTS BASED ON

3 3 5 6 7 7 6 1 , INSPECTION OF GRAMS ALONE {WIXHQUT

REFERENCE TOOATA

3 4 5 6 7 7 5 4 FROM OTHER SOURCES)

5 6 4 4 6 7 2 1 1 5 7 ' 7 6 4 3 3 2 4 5 5 5 3 2 2 2 5 4 5 5 2 1

1 2 3 3 5 4 1 1 1 0 5 6 5 4 2 3 3 4 6 5 6 5 4 3 4 2 4 5 5 5 4 3 3 3 4 6 3 4 3 2 3 2 2 3 2 0 0 0

I

- MONTH AND Y E A R

DECEMBER 1982

APPROVED JOIIN B. TOWNSHEND, CHIEF, UXLEGE OBSERV~TORY - OBSERVER IN CHARGE.

NOAA FORM 76-lad SUPERSEDES CLGS FORM 81m * U.S. GOVERNMENT PRlHTtNG OFFlCE:197S-761-057

K S C A L E USED: D I LOWER LIMIT FOR K = 9.. . . . . . ,, CURRENT SCALE VALUE.. . . . ., . LOWER LIMIT FOR K = s . . . . . . . .

H Z

S C A LIH GS AND COMPUTATtOWS HAVE BEEN CHECKED.

683.8 3 73

2550

321.7 7-79

251U

1 1 Imm)

['Y/mm) I

(to nearest 1 OY]

si*

pg, p i 1, p i 2, sfe.

PR3NCIPAL MAGNETIC STORMS wm-A FOR 8 b U R ~ T ' E U U t . 1 I ' I 1 & l Pnrrlu ' SHVtROHMLHTAL DATA SfRVlCf , NOAA

BOULOCR, COLQRAOO .OSOt U.8.A.

AWAL PShTETOGRAPB -

PERIOD C r n I O I P C W W L K P ?ma I rn S C ~ ~ E ' V A U E BASE-

0000U.Z~ 12-/-62 ]2$'00U.75 /2-3/-83 ,! A/&M 3.7 Z / ~ M 37" Y Z ~ O d E

D 1 I

moo U.7, /$ -/ -62 1 2 f 0 0 U . r ~ )5! -31-82 7 s b/mm /275/ b'

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m O D C m f m C ~ R P

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D B 5

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D m m: DEC J 2 3 4 /3 /4 1 5 ,3/ . , * , 5 # 6 * , , -

MACMEtOGRkM HOUR t Y ICALtMCS

t J t w ~ r p l m r e d C 1 e m l i m ~ w c n m i a brerr. of a#uetir a t m .

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MAGHETOCRAM HOURLY 3ChLIHGJ IuntvEus*L T I M E )

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