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GEOPHYSICAL OBSERVATORY REPORT

MAGNETIC OBSERVATORIES

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VOLUME 36 No. 6 JUNE 1988

OF MINERAL RESOURCES, GEOLOGY & GEOPHYSICS

DEPARTMEST OF PRIMARY INDUSTRIES AND ENERGY

Minister for Resources: Senator the Hon. Peter Cook

BUREAU OF MINERAL RESOURCES, GEOLOGY AND GEOPHYSICS

DIRECTOR: R.W.R. Rutland AO

This report was prepared by Geomagnetism Section, Division of Geophysics

CHIEF OF DIVISION: M.U. McElhinny

ISSN 0433-5015

Published for the Bureau of Kineral Resources,Geology and G&ophysics by the Australian Government Publishing

Service.

For further Information write to:

GEOMAG.\'ETISM SECTION BUREAU OF MINERAL RESOURCES G.P.O. BOX 37a CANBERRA A.C.T. 2601

iV-"' T.jJ \ \ -•xy

I Commonwealth of Australia 198S

CONTENTS

Page

Contributing Observatories 4

K-Indices 5

Principal Magnetic Storms 9

Monthly Mean Values, Sudden Ccmmenceinents and Other Rapid Variations 10

The observers at Casey, Davis and Macquarie Island are officers of the Antarctic Division, Department of Science and Technology: their contributions are gratefully acknowledged. These obsei-vers and the Bureau of Mineral Resources (BMR) geophysicist at Mawson 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 International Association of Geomagnetism and Aeronomy. The unit of field intensity is nanotesia (nT). All times are in Universal Time.

COKTRIBUTING OBSERVATORIES

OBSERVATORY OBSERVER IN CHARGE

GEOGRAPHIC LAT LONG

GEOMAGNETIC LAT LONG

FORT MORESBY I. D.Ripper 9' 25 S 147' 09 E -18.2' 219. .6' CHARTERS TONERS J . M.Millican 20' 05 S 146- 15 -28.8' 220. .2' LEARMONTH «. W.McMullan 22 ' 13 "S 114' 06 'E -33.4' 185. ,5' GNANGARA P. J.Gregson 31' 47 S 115' 57 E -42.9' 187. . 8 ' CANBERRA P. A.Hopgood 35' 19 S 149' 22 'E -43.5' 226. 4 ' MACQUARIE I G. Kowalik 54' 30 'S 158 ' 57 'E -60.6' 244 . 6' KAIv'SO.V R. Hutchinson 67' 36 'S 62 ' S3 'E -73.3' 105. 9 ' DAVIS H. Craven 68 ' 35 's 77' 58 'E -76.9' 123. .5' CASEY T. Maggs 66' 17 s 110' 32 'E -77.5' 182. 4 '

MAGNETOGRAPHS

OBSERVATORY CODE TYPE ELEMENT/SCAU

PORT MORESBY PMG La cour (A) H/3 D/5 CHARTERS TOh'ERS CTA EDA/ELSEC (D/1) X Y LEAF.MOKTH LRM EDA/ELSEC (D/1) X Y GNA.'.'GARA GNA Eschenhagen(A) H/3 D/7 CANBERRA CNB ELSEC (D/.l) D I MACQUARIE ISLAND MCQ PE'A (D/.l) X Y KAI 'SOW MAIv' PEM (D/.l) X Y

Z/4 Z Z Z/6 F Z Z

A = analogue, 20mm/hr, scale values in nT/m.n: D/1 = ditigal, 1 ir.in readings, 1 nT resolution D/.l = ditigal, 1 min readings, 0.1 nT resolution P£M = BMR Photo-electronic magnetograph.

MAGNETOMETERS

Absolute data are based on observations made with QHM's, BMZ's, fluxgate-theodolites, declinometers and proton precession magnetometers.

Errors in preliminary values obtained from magnetograms are not likely to exceed 5 nT or 0.5 minutes of arc.

POUT MORESHY

MAGNETIC K-IUDICES - JUNE 198B

Range for lower limit of J<=9 is 300nT

DAY K -INDICES K-SUM

01 1 1 2 2 2 2 1 1 12 02 1 3 3 2 1 1 1 o 14 03 1 1 1 1 1 1 1 1 08 04 1 1 1 1 2 1 1 1 09 05 2 1 2 1 3 1 3 2 15 06 3 3 2 1 1 1 2 15 07 1 2 3 3 1 2 1 2 15 08 -> 2 2 3 1 'y 1 2 15 09 2 I 1 O 2 2 3 1 14 10 3 2 3 2 1 2 1 2 16 11 2 4 4 1 1 2 1 1 16 12 1 2 1 1 1 1 1 1 09 13 3 2 1 1 1 1 1 2 12 14 2 3 5 4 3 3 3 1 24 15 2 1 2 2 1 1 1 2 12 16 2 3 2 1 3 1 2 2 16 17 2 3 3 3 2 1 2 18 18 2 2 2 3 3 3 3 2 20 19 2 3 3 4 3 3 3 3 24 20 2 3 4 - - - - - —

21 1 1 1 i 2 1 1 1 09 22 2 3 3 2 2 2 2 2 18 23 2 3 2 1 1 1 2 2 14 24 3 3 2 3 4 4 2 2 23 25 3 4 4 5 2 3 3 4 28 26 3 2 3 3 1 2 3 3 20 27 3 2 2 2 1 1 1 2 14 28 2 2 3 4 1 1 1 1 15 29 2 5 5 3 4 3 3 2 27 30 3 3 3 3 3 3 3 2 23

Mean of K-Sum is 16.4

K f

Frequency of K-Indices

1 79

2 3 4 80 59 12

6 7 0 0

9 -0 5

GNANGARA

MAGSETIC K-IRDICES - JUNE 1988

Range for lower limit of K=9 is 450nT

DAY K-INDICBS K-SUM

01 1 1 1 1 2 1 1 1 09 02 1 1 1 1 0 0 1 1 06 03 0 0 0 0 0 0 0 0 00 04 0 0 0 0 1 1 1 0 03 05 1 0 0 0 3 1 3 3 11 06 3 1 1 0 0 0 0 0 05 07 1 1 2 1 0 1 0 1 07 OB 1 1 1 2 0 2 2 1 10 09 0 1 0 1 2 1 2 1 08 • 10 3 2 3 2 1 1 0 1 13 11 2 2 1 0 2 2 1 0 10 12 1 1 0 0 0 0 0 0 02 13 2 1 1 0 0 0 0 0 04 14 2 3 4 3 3 3 3 2 23 15 2 1 1 1 0 2 1 2 10 16 2 2 1 0 2 1 3 2 13 17 2 2 2 1 3 2 1 3 16 18 2 2 2 2 4 2 3 2 19 19 2 2 2 4 3 4 4 2 23 20 3 3 3 2 1 0 0 14 21 0 0 1 2 2 1 1 1 08 22 2 3 2 2 3 2 2 1 17 23 1 2 1 1 1 2 1 2 11 24 2 4 1 2 4 3 3 3 22 25 3 3 3 4 3 3 3 3 25 26 3 2 3 1 2 2 4 3 20 27 2 2 1 1 1 1 2 2 12 28 1 2 2 3 1 1 1 2 13 29 1 4 4 2 4 4 4 3 26 30 3 3 3 3 4 4 4 3 27

Mean of K-Sum is 12.9

Frequency of K-Indices

K : 0 1 2 3 4 5 6 7 6 $ -f : 4B 71 63 41 17 0 0 0 0 0 0

CANBERRA

MAGNETIC K-INDICES - JUNE 1988

Range for lower limit of K=9 is 450nT

DAY K--INDICES K-SUH

01 0 2 1 2 1 1 1 1 08 02 1 1 1 1 0 0 0 0 04 03 0 0 0 1 0 0 0 0 01 04 0 0 0 0 0 0 0 0 00 05 1 1 0 0 2 0 2 2 OB 06 2 I 1 0 0 0 0 0 05 07 0 1 2 2 0 2 0 1 08 08 0 0 1 3 0 2 1 0 07 09 0 0 0 1 3 1 2 0 07 10 2 1 3 2 0 2 0 1 11 11 2 2 1 1 2 1 0 10 12 1 0 1 0 0 0 0 03 13 1 1 0 0 0 0 1 0 6 14 3 4 3 3 3 2 1 20 15 1 1 0 0 1 1 (1) (06) 16 (1) 1 (0) 0 2 1 1 1 (07) 17 1 2 1 3 1 1 1 11 18 1 1 3 3 3 2 1 15 19 2 2 2 4 3 3 3 2 21 20 2 2 3 2 2 0 0 0 11 21 0 0 0 2 2 0 1 1 06 22 0 2 2 2 3 1 1 1 12 23 2 1 1 1 1 1 '> 11 24 2 3 1 2 3 3 2 3 19 25 2 3 3 4 1 3 3 3 22 26 2 2 2 2 1 2 3 3 16 27 2 1 0 1 1 1 1 1 OS 2 8 0 1 2 3 1 1 1 1 10 29 2 4 4 3 4 4 4 26 30 o 3 -1 2 3 4 3 21

Mean of K-Sum is 10.7

K : f :

Frequency of K-Indices

0 1 2 3 65 81 52 33

9 -0 0

KAUSON

MAGNETIC K-XHDICES - JUNE 1988

Range for lower limit of i:=9 is ISOOnT

DAY K-INDICES K-SUM

01 3 3 2 2 2 2 3 3 20 02 3 2 0 0 2 3 3 2 15 03 0 0 0 0 0 0 0 2 02 04 0 0 0 0 0 0 0 3 03 05 1 0 1 0 0 1 6 5 14 06 4 4 2 0 0 1 0 0 11 07 0 1 2 2 1 4 5 15 08 3 4 2 2 1 1 4 4 21 09 0 0 1 0 1 1 2 3 OS 10 2 5 3 2 1 0 3 18 11 3 4 4 2 1 1 4 2 21 12 1 1 1 0 0 1 0 0 04 13 2 3 0 0 0 0 4 3 12 14 5 6 4 4 2 2 4 5 32 15 4 3 3 1 1 0 4 5 21 16 5 4 3 1 0 0 5 4 22 17 5 6 5 2 2 4 4 6 34 18 4 2 2 3 2 3 4 4 24 19 4 5 5 4 3 3 7 4 35 20 5 6 5 4 O 1 0 1 24 21 1 3 5 2 2 2 1 3 19 22 3 5 4 3 3 2 5 5 30 23 3 4 3 2 2 3 3 6 26 24 4 5 3 2 2 3 6 6 31 25 4 5 5 4 2 3 3 1 27 26 5 2 3 1 1 3 5 6 26 27 4 3 2 2 1 1 4 5 22 28 5 3 4 4 2 1 0 5 24 29 2 5 7 3 2 4 6 4 33 30 5 6 5 3 4 3 4 5 35

Mean of K-Sum is 21.0

X f :

Frequency of K-Indices

0 1 2 3 4 5 6 42 31 43 42 39 30 11

9 -0 0

JVWE 1988

PRINCIPAL MAGSETTC STORMS

I Commencement | SSC-amplitudc I Kax. 3tir K-index \ RajiQCS \ OT End | OBSERVATORY \day hr min\typel D( ') E(nT) ZfnTJlday {3hr-pBriod) IK \D(') H(nT) Z(nT)\daY hr f

I I 1 I I 1 I I Port Moresby I 24 00 2R Jssc 1 -0.5 +17

I 29 04 07 ISSC* ! +0.6* +24 +23 | 29 1

Charters Toilers ) 29 04 08

Gnangara

Canberra

I

I i |ssc*| I I I I I I I ! ! I

+0.7 +25 -

l^IL

+16 1 25 (4) +23 1 29 (2,3)

- 2 j 1 29 (2,3)

NIL

|5 I |5 I I I f5 I I I I ! I ! I I I I

8 140 50 1 27 10 5 110 70 1 30 20

6.5 78 27 1 1 30 24

JVNE 1988

OBSERVATORY

PRKLIMINARY MONTHLY MEAN VALUES

B

JUL. D

dea min Z nT

F nT

PORT MORESBY 35929 06' 36. 2 ' E -23718 43052

CHARTERS TOWB.hS 31763 07- 46. 6 ' E -38268 49733

LEARMONTH 29479 00 ' 36. 3 • W -44424 53315

GNAlilGARA 23216 03 ' 11. I • W -53810 58605

CANBERRA 23617 12 ' 27. .4 ' E -53688 5S677

MACQUARIE ISLM:D 12572 29- 33. . 7 • E -63558 64790

MAiiSON 13479 64 ' 04. W -46136 49699

DAVIS 16637 77' 07. .1 ' W -52087 54680

CASEY 9595 91 ° 35. .3 • W -64014 64729

The values are derived from ir.agnetograms for selected quiet days except at Davis and Casey where they are derived from seai-weekly absolute iseasurements.

SUDDEN COMMENCEMEiHTS AKD OTHER RAPID VARIATIONS

OBSERVATORY DAY TYPE AND QUALITY TIME

SENSE AND AMPLITUDE OF CHIEF MOVEMENT

B(r.T) D(nT) Z(nT)

PORT MORESBY 24 ssc B 0028 •i-17 - 5 + 16

29 ssc*B 0407 +24 + e* +23

CHARTERS TOWERS 05 ssc*C 1223 •HO mm O

24 ssc B 0029 + 13 - 8

29 ssc*3 040S +25 + e* - 2

Gt:Ai:GARA 05 ssc B 1222 + 7 + 5 + 4

24 SSC*B 0030 -10* -15* ~ e*

29 ssc*B 0408 +17 + 10* +10*

CATWERRA 24 SSC*B 0030 + 10* -12 + 3

29 ssc B 0408 +24 + 11 + 3

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R No. 85/1665 (21) W

Cat.No. 88 16668 vS 00 00

Printed by Highland Press, Canberra