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AUSTRALIAN GEOMAGNETISM REPORT

M A G N E T I C O B S E R V A T O R I E S

««-«/10

BUREAU OF M I N E R A L R E S O U R t E S , , G E O L 0 G Y & G E O P H Y S I C S

V O L U M E 40 No.3

MARCH 1992

DBP2WTMEMT OF PRIMARY INDDSTRZES AND ENEROY

Minister for Resources: The Hon. Alan Griffiths MP

BUREAD OF MINERAL RESOURCES, OEOWGY AND GEOPHYSICS

EXECUTIVE DIRECTOR: R.W.R. Rutland AO, FTS

This report was prepared by:

Geomagnetism Section Geophysical Obsetvatories & Mapping Program

Minerals & Environment Group

CHIEF OF DIVISION : D. Denham AM

For further Information write to: GEOMAGNETISM SECTION BUREAU OF MINERAL RESOURCES G.P.O. Box 378 CANBERRA, A.C.T., 2601 AUSTRALIA.

BMR GEOLOGY AND G E O P H Y S I C S A U S T R A L I A

Published for the B.M.R.G. & G. by the Australian Government Publishing Service

ISSN 1035-1515

commonwealth of Australia 1992

COMTEMTS

Page

Contributing Observatories & Instrumentation ... 4

K-Indices 5

Principal Magnetic Storms 9

Preliminary Monthly Mean Values 10

International Quiet & Disturbed Days lo

Sudden Storm Commencements and Solar Flare Effects 11

The observers at Casey, Davis and Macguarie Island are officers of the Antarctic Division, The Department of the Arts,Sport,the Environment and Territories.The Division's logistic support and the Observers contributions are gratefully acknowledged.These observers and the Bureau of Mineral Resources' (BMR) geophysicist at Hawson are members of the Australian National Antarctic Research Expeditions (ANARE).

Data from the Port Moresby Geophysical Observatory are contributed by the Geological Survey of Papua New Guinea.

The terminology used in this report is that accepted by the International Association of Geomagnetism and Aeronony (lAGA). The unit of field intensity is the nanoTesla (nT). All times are in Universal Time (UT).

CONTRIBnTING OBSERVRTOBTBS

OBSERVATORY OBSERVER IH CHARQE

GEOQRAPHXC lAT. LONO.

GEOM&QMETIC lAT. LONG.

PORT MORESBY I.D.Ripper 9- 2 5 8 147- 09 E -18.1* 219. .8 CHARTERS TOWERS J.M.Millican 20* 0 5 S 146- 15'E -28.7' 220, .3 LEARMONTH M.W.McMullan 22' 13 S 114 • oe'E -33.2' 185, .5 GNANGARA P.J.Gregson 31* 47 S 115" 57 E -42.7' 188, ,0 CANBERRA P.A.Hopgood 35* 19 S 149- 22 E -43.3° 226, .6 MACQUARIE IS. R. Jones 54- 30 S 158- 57 E -60.4' 244, ,7 MAWSON J.L. Jamieson 67* 36'S 62- 53 E -73.2" 106, .3 DAVIS D. Neudegg 68- 35'S IT 58 E -76.8" 124, ,0 CASEY N. Hifsud 66* 17 S lie 32 E -77.3" 182, ,7

* Geomagnetic i co-ordinates based i on the 1980 DGRF Geomagnetic North pole position of 78.8*N, 70.9'W

MAGNETOGRAPHS

OBBBBYftTPBir PORT MORESBY CHARTERS TOWERS LEARMONTH GNANGARA CANBERRA MACQUARIE IS. MAWSON

CODE MODEl. (TYPE/RES.> BLBMENT/BCALE-VALDE PHG CTA LRM GNA CNB MCQ MAW

La Cour EDA/Elsec EDA/Elsec Elsec El sec PEM PEM

(A) (D/1) (D/1) (D/.l) (D/.l) (D/.l) (D/.l)

H/3 X X D D X

D/5 Y Y I I Y

Z/4 Z Z F F Z Z

A • analogue, aomm/hr, scale values in nT/nun D/1 = digital, 1 minute readings, 1 nT resolution D/.l ' digital, 1 minute readings, 0.1 nT resolution PEM = BMR Photo-electronic magnetograph

HAGHETOHBTgyg

Absolute data are based on observations made with QHM's, BMZ's, fluxgate-theodolites, declinometers, proton vector magnetometers and proton precession magnetometers. Errors in preliminary values obtained from magnetograms are not likely to exceed 5 nT or 0.5 minutes of arc.

PORT MOREBBY

MAGNETIC K-I«OICBS - MARCH 1992

Range for lower limit of K=9 is 300nT

DAY K-ZMDICES K-SUM

01 2 2 3 3 2 3 2 2 19 02 2 3 2 2 3 2 3 2 19 03 2 3 2 2 2 3 2 1 17 04 2 2 2 2 3 4 2 2 19 05 3 3 3 2 2 3 2 3 21

06 2 2 3 1 1 0 1 2 12 07 2 1 2 2 2 3 2 3 17 08 3 2 3 2 4 2 2 2 20 09 4 3 4 5 3 4 3 2 28 10 3 3 2 3 2 3 3 3 22 11 3 3 3 3 3 3 2 2 22 12 2 3 3 3 2 2 1 2 18 13 2 1 3 3 2 1 0 1 13 14 2 1 1 1 1 2 2 2 12 15 2 2 3 4 2 3 2 2 20 16 2 2 2 3 4 2 2 2 19 17 2 2 2 5 5 4 5 5 30 18 5 4 4 2 3 2 1 3 24 19 2 2 1 1 1 2 1 2 12 20 1 1 2 0 1 I 1 2 09

21 o o

2 2 4 4 4 3 3 3 25

23 - 2 4 3 3 2 3 3 —

24 3 3 1 2 2 4 3 3 21 25 2 2 3 3 3 1 1 1 16

26 2 2 2 3 3 2 3 2 19 27 - - - - - - 2 3 3 —

28 9Q 2 2 2 3 - - - - —

30 1 2 2 2 3 2 3 3 18

31 2 2 2 2 3 3 3 3 20 Maan of S-Sum is 18.9

Frequency of R-Z&dioas K S O 1 2 3 4 5 6 7 8 9 -f : 3 28 99 71 15 6 0 0 0 0 26

qHMigftRA MAGNETIC X-IMDICES - MIOICH 1992

Range for lower limit of K=9 is 450nT

DAY K--INDICES K-SOM

01 3 3 3 3 2 3 2 3 22 02 2 2 3 2 3 2 3 3 20 03 3 2 1 1 1 3 2 1 14 04 2 1 3 1 2 4 3 2 18 05 3 2 1 2 1 3 2 3 17 06 3 1 3 0 0 0 2 2 11 07 2 1 1 1 1 3 2 3 14 08 2 2 2 2 3 2 2 3 18 09 4 3 3 5 3 3 4 3 28 10 3 1 3 1 1 2 1 4 16 11 3 2 2 3 3 2 2 2 19 12 1 1 2 2 1 0 0 0 07 13 1 1 1 2 1 1 1 1 09 14 1 0 0 1 0 1 0 1 04 15 2 1 2 2 1 2 2 1 13 16 1 1 2 2 3 2 4 4 19 17 2 1 1 3 3 3 4 3 20 18 6 3 4 2 3 2 1 1 22 19 2 1 2 1 1 2 1 1 11 20 1 1 2 1 0 1 1 2 09 21 2 3 3 4 5 4 4 4 29 22 4 3 1 1 3 3 5 5 25 23 4 3 3 4 4 3 5 3 29 24 3 2 1 3 2 4 4 4 23 25 3 2 2 2 3 2 2 0 16 26 2 1 0 3 3 3 4 2 18 27 3 1 1 0 2 3 3 3 16 28 2 1 1 3 3 3 2 3 18 29 3 2 2 3 3 4 4 2 23 30 1 0 1 1 2 1 4 2 12 31 2 1 0 1 1 3 3 3 14

Mean ot K-8ub is 17.2

Fraquanoy of K-Indioea K l 0 1 2 3 4 5 6 7 B 9 -f : 16 65 68 70 23 5 1 0 0 0 0

CRMBERRA

MAGNBTIC K~ZlIOICES - MKRCB 1992

Range for lower limit of K=9 is 450nT

DAY K' -IHDXCBB K-80M 01 1 3 3 3 1 2 2 2 17 02 1 2 2 1 2 2 2 1 13 03 1 2 2 2 2 2 3 1 15 04 1 2 3 2 2 4 2 2 18 05 1 2 2 2 1 3 2 3 16 06 1 1 3 1 1 0 0 2 09 07 1 1 1 2 1 3 2 2 13 08 2 3 2 2 3 2 1 2 17 09 3 3 3 5 3 2 4 2 25 10 2 3 3 3 2 2 3 3 21

11 2 3 4 4 3 3 2 2 23 12 1 2 3 3 2 2 1 1 15 13 0 2 2 3 2 1 0 0 10 14 1 1 1 1 0 1 0 1 06 15 1 2 2 3 2 3 2 1 16 16 1 1 3 3 3 3 3 3 20 17 1 2 1 4 4 4 4 4 24 18 4 4 4 2 3 2 2 2 23 19 1 0 1 0 0 1 0 1 04 20 1 1 2 0 0 1 0 1 06

21 2 2 3 4 4 3 3 3 24 22 3 3 1 1 2 3 3 3 19 23 3 2 3 3 3 2 4 2 22 24 2 3 2 3 1 4 3 3 21 25 2 2 3 2 4 1 1 1 16

26 1 2 1 3 2 2 3 3 17 27 1 1 2 1 2 2 3 2 14 28 1 1 1 3 3 3 1 2 15 29 2 2 2 3 3 4 3 2 21 30 1 2 1 2 2 1 3 2 14

31 3 1 1 2 1 3 3 2 16

Meaa of K-Boa is 16.5

Fra^ane^ ot S~lndlcea

K l 0 1 2 3 4 5 6 7 8 9 -f i 14 64 84 67 18 1 0 0 0 0 0

D&y R-INDICBS K-8QM 01 3 5 6 3 2 3 3 4 29 02 3 5 3 3 3 3 5 3 28 03 4 5 5 3 3 4 3 4 31 04 2 3 4 3 3 3 5 5 28 05 3 5 5 3 4 4 4 5 33 06 4 3 4 2 1 1 2 2 19 07 3 3 3 3 3 4 4 6 29 08 4 6 5 3 3 3 2 2 28 09 5 5 5 5 3 4 5 2 34 10 4 5 4 4 3 3 5 4 32

11 5 6 5 5 3 6 5 3 38 12 2 6 6 3 3 3 2 3 28 13 2 5 4 3 2 2 2 2 22 14 2 3 3 2 1 1 1 1 14 15 3 3 3 4 2 3 2 2 22 16 2 3 3 4 3 5 5 4 29 17 2 4 4 4 4 4 4 4 30 18 4 5 5 3 2 1 1 2 23 19 1 2 2 1 0 1 2 3 12 20 3 2 2 1 0 1 2 2 13 21 3 3 3 4 4 5 4 5 31 22 4 5 4 3 3 3 7 6 35 23 7 6 5 4 4 4 7 5 42 24 6 6 5 4 3 6 5 5 40 25 6 6 5 3 4 3 5 4 36 26 3 4 3 3 3 3 5 4 28 27 4 4 3 2 2 2 6 6 29 28 4 5 5 3 3 3 4 5 32 29 5 5 5 4 3 4 7 5 38 30 4 5 5 2 3 2 4 5 30 31 5 4 3 2 3 3 3 5 28

KAWBQW DICES - MMtCH 1992

R-INDICBS K-8QM 5 6 3 2 3 3 4 29 5 3 3 3 3 5 3 28 5 5 3 3 4 3 4 31 3 4 3 3 3 5 5 28 5 5 3 4 4 4 5 33 3 4 2 1 1 2 2 19 3 3 3 3 4 4 6 29 6 5 3 3 3 2 2 28 5 5 5 3 4 5 2 34 5 4 4 3 3 5 4 32

11 5 6 5 5 3 6 5 3 38 12 2 6 6 3 3 3 2 3 28 13 2 5 4 3 2 2 2 2 22 14 2 3 3 2 1 1 1 1 14 15 3 3 3 4 2 3 2 2 22 16 2 3 3 4 3 5 5 4 29 17 2 4 4 4 4 4 4 4 30 18 4 5 5 3 2 1 1 2 23 19 1 2 2 1 0 1 2 3 12 20 3 2 2 1 0 1 2 2 13 21 3 3 3 4 4 5 4 5 31 22 4 5 4 3 3 3 7 6 35 23 7 6 5 4 4 4 7 5 42 24 6 6 5 4 3 6 5 5 40 25 6 6 5 3 4 3 5 4 36 26 3 4 3 3 3 3 5 4 28 27 4 4 3 2 2 2 6 6 29 28 4 5 5 3 3 3 4 5 32 29 5 5 5 4 3 4 7 5 38 30 4 5 5 2 3 2 4 5 30 31 5 4 3 2 3 3 3 5 28

Mean of X-Sub is 28.7

Fraquancy of K-lndlo«s K s 0 1 2 3 4 5 6 7 8 9 -f : 2 13 37 74 52 50 16 4 O O O

>8C<a.pUtud« Max. 3hr X-ind Ranges UT Bad

Day Hr Min Type D C ) H(nT) S(nT) Day (3hr-p«riod) X D C ) H(nT) 8(nT) Day Br

Port Moresby 17 09 50 ssc +0.9 +45 +38 17(4,5,7,8); 18(1) 5 7 10 70 18 13

Nil Principal Magnetic Storms

Canberra 17 09 52 ssc* -2.9* +50 +13 17(4-8);18(l-3) 4 18.3 88 42 18 09

1992

s. 3hr K-

Day (3hr-p«riod)

UT

D C ) H(nT) 8(nT) Day Br

Port 17 09 50

Nil

17 09 52

+0.9 +45 +38

Principal

-2.9* +50 +13

17(4,5,7,8); 18(1)

Magnetic

17(4-8);18(l-3)

10 70 18 13

Storms

18.3 88 42 18 09

MARCH 1992

MBMI

OBSERVATORY H D Z F nT deg min nT nT

PORT MORESBY 35924 06° 35.5' E -23676 43024 CHARTERS TOWERS 31747 07' 47.4 ' E -38226 49690 LEARMONTH 29547 00* 25.0' W -44410 53341 GMANGARA 23188 02* 59.9" W -53775 58561 CANBERRA 23647 12" 32.1' E -53628 58610 MACQUARIE IS. 12572 29" 51.7 ' E -63447 64681 MAWSON 18506 64" 34.9' W -45896 49486 DAVIS 16672 78" 07.6' W -51883 54495 CASEY 9634 92" 11.1' W -63870 64593

The values are derived from magnetograms over the Quietest 5 International Days, except at Mawson, Davis and Casey, where the locally quietest days are used.

IHTERMATIOMAI. OOIET MID DISTURBED PAY8

Quietest days (1- 5): 19 14 20 13 06 Quietest days (6-10): 15 28 07 03 27 Most Disturbed days : 23 09 17 24 21

10

SUDDEN STORM COMNEMCEMEMTS (aao): MAKCH 1992

Obsarvatory Typa

Day and O.T. Quality

Sensa and Anplitude of Chief Hovaaent

H(nT) D(nT) l(nT)

PORT MORESBY 17 SSC h 0950 +45 +9 +38

GNANGARA 17 SSC B 0951 +40 +22 +11

CANBERRA 17 SSC*B 0 9 5 2 + 5 0 - 2 0 * + 1 3

BOIAR 91ARS BF?BCTe (aim)i M & B C H 1 9 9 2

Obaarvatory O.T. of mtm -

Day Began Max.

Con- Sanaa & Aaplituda ffir-

1. H(nT) D(nT) 2(nT)

PORT MORESBY Nil sfe's reported

GNANGARA Nil sfe's reported

CANBERRA Nil sfe's reported

11

A U S T R A L I A N G E O M A G N E T I S M R E P O R T V O L U M E 40 No.3 M A R C H 1992