COMMONWEALTH OF AUSTRALIA DEPARTMENT OF NATIONAL DEVELOPMENT BUREAU OF MINERAL RESOURCES, GEOLOGY AND GEOPHYSICS

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1 Blv -fr- COMMONWEALTH OF AUSTRALIA DEPARTMENT OF NATIONAL DEVELOPMENT BUREAU OF MINERAL RESOURCES, GEOLOGY AND GEOPHYSICS BUREAU OF TvHNERAL RESOURCES 6E0FHYS1CAL & Ref. LIBRARY GEOPHYSICAL OBSERVATORY REPORT VOL 13 NO. 4 APRIL 1965 Issued under the authority of the Hon. David Fair bairn, BMR S AUS.S copy 2 Minister for Nationai Development

2 DEPARTMENT OF NATIONAL DEVELOPMENT Minister - Hon. David Fairbairn, D.F.C., M.P. Secretary - R.W. BOSWELL BUREAU OF MINERAL RESOURCES, GEOLOGY AND GEOPHYSICS Director - J.M. RAYNER This Report was prepared in the Geophysical Branch; Assistant - Director L.S. PRIOR Supervising - Geophysicist W.D. Parkinson

3 CON T E H T S Page Contributing Observatories 2 Geomagnetic Data: Mawson 5 Wilkes 6 Macquarie Island 7 Toolangi 8 Gnangara 10 Port Moresby 12 Unless otherwise stated all times are given in Greenwich Mean Time The terminology used in this report is that accepted by international convention. Should further information be required, explanation can be obtained by applying to:- Assi'stant Director (Geophysics), Bureau of Mineral Resources, Geology and Geophysics, 203 Collins Street, MELBOUEUE, C.1., AUSTRALIA.

4 CONTRIBUTING OBSERVATORIES GMANSARA MASEETIC OBSEHVATORY P.M. Mcflregor, Observer in Charge Geographic Latitude 31 47'S Geomagnetic Latitude Longitude Longitude 'E Instruments Askania magnetometer No La Cour QHMs No.291, 292, 293 La Cour BMZ No.120 Eschenhagen D, H & Z recording variometers Sensitivity i D 1.1 H 2.5 Z 5.3 Recording speed miry mm Y/mm Y/mm 20 mm/hour Askania (Eschenhagen type)h variometer with visual recorder Sensitivity : 3 Y/mm Recording speed : 20 mm/hour MACQUARIE ISLAND MAGNETIC OBSERVATORY R.G Sutton, Observer in Charge Geographic Latitude 54 30'S Geomagnetic Latitude Longitude Longitude 'E Instruments Askania declinometer No La Cour QHMs Nos.177, 178, 179 La Cour BMZ No.64 La Cour D, H & Z recording variometers Standard instrument : Sensitivity Recording speed Rapid-run insti-ument: Sensitivity Recording speed D 2.4 miry^mm H 24.8 Y/mm Z 20.5 Y/mm 15 mm/hour D 1.0 min/mm H 5.4 Y/mm Z 9 Y/mm 180 mm/hour

5 CONTRIBPTIMG OBSERYATOEIES MAWSON MAaMBTIC OBSERVATORY J. Haigh, Observer in Charge Seographic Latitude 67 36'S Geomagnetic Latitude Longitude Longitude 62 53'E Instruments Askania declinometer No La Cour QHMs llos.300, 301, 302 La Cour BMZ No.62 La Cour D, H & 2 recording variometers Normal sensitivity Recording speed Low Sensitivity Recording speed Bar fluxmeter D magnetograph Recording speed I) 0.9 min/ram K 9.5 Y/mm Z 10.0 Y/mm. 15 mm/hour D 2.4 min/mm H 51 Y/mm Z 50 Y/mm 15 mm/hour 5 mm/minute PORT MORESBY MAGNETIC OBSERVATORY J.A. Brooks, Observer in Charge Geographic Latitude 9 24'S Geomagnetic Latitude Longitude Longitude 'E Instruments Askania declinometer No La Cour QHMs Nos.187, 188, 189 La Cour BMZ No.68 La Cour D, H & Z recording variometers Standard instrument : Sensitivity Recording speed Rapid-run Instrument: Sensitivity Recording speed D 0.44 min/mm H 2.9 Y/mm Z 3.2 Y/mm 15 mm/hour D 0.05 min/mm H 1.2 Y/mm Z 0.3 Y/mm 180 mm/hour

6 CONTBIBUTINg OBSERVATORIES TOOLAHGI MA6IJETIC OBSERVATORY C.A. van der Waal, Observer in Charge Geographic Latitude 37 32'S Longitude 145''28'E Geomagnetic Latitude Longitude Instruments Ruska magnetometer No.48/3 La Cotir QHMs Hos.288, 289, 290 La Cour BMZ No. 119 La Cour D, H & Z recording variometers Sensitivity : D 1.2 min/mm H 4.5 y/mm Z 4.4 Y/mm Recording speed : 15 mm/hour WILKES MAGNETIC OBSERVATORY P.J. Browne-Cooper, Observer in Charge Geographic Latitude Se^lS'S Longitude 'E Geomagnetic Latitude Longitude 179.2'' Instruments C.I.W. field magnetometer and theodolite earthinductor No.28 La Cour QHMs Hos.492, 493, 494 La Cour BMZ No.236 Huska D, H & Z recording variometers Standard instrument : Sensitivity : D 10 min/mm H 25.1 Y/mm Z 20.9 Y/mm Recording speed : 20 mm/hour Rapid-run instrument: Sensitivity : D 1.1 min/mm H 5.1 Y/mm Z 7 Y/mm Recording speed : 240 mm/hour

7 M A W S 0 N MAGMETIC K-INDICES - APRIL 1965 Range for lower limit of K=9 is 1500 gammas Day K-Indices K-Sum _ _ PREIIMINARY MONTHLY MEAN VALUES Based on 10 selected q.uiet days 1965 H D Z y ' y April

8 WILKES MAGNETIC K-IMDICES - APRIL 1965 Range for lower limit of K=9 is 2500 gammas Day K- Indices K-Sum ' PRELIMINARY MOMTHLY MEAH VALUES Based on 10 selected quiet days 1965 H D y 0 I April W Z Y

9 MACQUABIE ISLAUD MAGNETIC K-IMDICES - APRIL 1965 Range for lower limit of K=9 is 1500 gammas Day K- Indices JL-Sum c PRELIMIUARY MOMTHLY MEAN VALUES Based on 10 selected quiet days 1965 H D Z Y 0 1 Y April ^

10 TOOLAHGI MA&HBTIC K-INPICES - APRIL 1965 Range for lower limit of K=9 is 500 gammas Day K- Indices K-Sum U ' f

11 TOOL A N G I PHELIMIMRY MOHTHLY MEAM VALUES Based on 10 selected quiet days 1965 H Y D April E Z y PRIHCIPAL MA&HETIC STORMS - APRIL 1965 sudden max.activity storm time commencements act- 0 to 9 Ranges date begin end type amplitudes iv- ity day 3-hr per. K D H Z D H Z h m d h y Y, y y sc s SUDDEN COMMENCEMENTS AND OTHER PHENOMENA - APRIL 1965 Sense of Movement Day Time Type H D Z h m pi2 B bp B pi2 B bp B pi2 B ssc C pc5 B pi2 B pi2 B bp B pl2 B bp B pl2 B ssc C pi2 B bp C -

12 GHAHGARA MAGNETIC K-IHDICES - APRIL 1965 Range for lower limit of K=9 is 350 gammas Day K- Indices K-Sum r

13 GHANGARA PBELIMIMRY MONTHLY MEAIT VALUES Based on 5 selected quiet days 1965 H Y D o I April W Z y PRINCIPAL MAGNETIC SOTRMS - APRIL 1965 sudden max.activity storm time commencements act- 0 to 9 Ranges date begin end type amplitudes iv- ity day 3-hr per. K D H Z D H Z h m d h Y 17 13U 1820 sc +1 -ts +2 7 ms 18 3, SUDDEN COMMENCEMENTS AND OTHER PHENOMENA - APRIL 1965 Sense of Movement Day Time Type H D Z h m bp B pi2 B pi2 B bp B bp B ssc B bp B

14 PORT MORESBY MAGNETIC K-IiroiCES - APRIL 1965 Range for lower limit of K=9 is 300 gammas Day K- Indices K-Sum _

15 PORT MORESBY PEELIMIHARY MONgHLY MEAU VALUES 1965 April Based on 10 selected quiet days H Y D 0 I 06 08,2E Z y PRINCIPA], MAGNETIC STORMS - APRIL 1965 sudden max.activity storm time commencements act- 0 to 9 Ranges date begin end type amplitudes iv- ity day 3-hr per. K D H D H Z Z 17 h m 1312 d 2015 h ssc Y +11 y SUDDEU COMMEMCEMEHTS AMP OTHER PHEMOMEMA - APRIL 1965 Sense of Movement Day Time Type H D Z h m bp C bp B ssc B si B si B bp B bp C bp B bp B bp C ssc B si B bp C ssc C

16 ..J- V BUREAU OF MINERAL RESOURCES GFOFHYSiCAL LIBRARY Rcf. B