f COMMONWEALTH OF AUSTRALli^, ^r^'l BUREAU OF MINERAL RESOURCES, 'f GEOLOGY AND GEOPHYSICS GEOPHYSICAL VOL. 1 NO 1 JANUARY

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1 Uf^ LEiOING COPY f COMMONWEALTH OF AUSTRALli^, ^r^'l DEPARTMENT OF NATIONAL DEVELOPMENT ' BUREAU OF MINERAL RESOURCES, 'f GEOLOGY AND GEOPHYSICS GEOPHYSICAL OBSERVATORY REPORT VOL. NO JANUARY 95 Issued under the authority of Senator The Hon. W. H. Spooner, Minister for National Development V s

2 DEPARTMENT OF NATIONAL DEVELOPMENT Minister - SENATOR THE HON. W. H. SPOONER, Secretary - H. 0, RAGGATT. BUREAU OF MINERAL RESOURCES, GEOLOGY AND GEOPHYSICS P. B. NYE - Director. J. U. RAYNER - Deputy Director. This Report was prepared in the Geophysical Section: R. F. THYER - Chief Geophysiclst. L. S. PRIOR - Supervising Geophysiclst.

3 C O N T E N T S Page Contributing Observatories Magnetic K-Indices Preliminary Monthly Mean Values of the Magnetic Elements Principal Magnetic Storms, Sudden Commencements Ionospheric Data, Watheroo Provisional Annual Mean Values of the Magnetic Elements Watheroo Toolangi Macquarie Island Heard Island 5 6 Watheroo Toolangi Macquarie Island 5 Heard Island 6 Watheroo 7 Toolangi 7 Median Hourly Values 8 Sporadic. Summary 9 Watheroo 0 Toolangi 0 Macquarie Island Heard Island Unless otherwise stated all times are given in Greenwich Mean Time«All correspondence in connection with information in this report should be addressed tos- Chief Geophyslcist, Bureau of Mineral Resources, Geology and Geophysics, 85 Bourke Street, Melbourne, C.. AUSTRALIA. NOTICE - Although this issue is designated Number of Volume, it is continuous with the series Gommencea in September 95.

4 . ^MTOIBPTINQ OBSERYATORIgS. WATHEROO mgbetic OBSERTATop Geographic Latitude 0 i9's Longitude ir5 5s'K Gsoffiagnetle Latitude -,8 Longitude 85,6 lngtri jnept Magnetic Equipment - D.T.M. C.I.W, Magnetometer No.7. D.T.M. C.I.W. Earth Inductor No.. Eschenbagen pattern D,H,Z, recording varioneters, normal sensitivity, 0iam/hour recorder. La Cour pattern D,H,Z, recording variometers, normal sensitivity quick run (SOma/hour) recorder. Ionospheric Equipment - C.S.I.R.O. pattern -I6MC/S Sweeptime minutes. TOOLANQI memetic OBSEPYATQBX Geographic Latitude 7 's Longitude 508'e Gecoagnetic Latitude -6.7 Loiigitude 0.8 Jpstriffientg J Askania pattern Magnetometer No Schulze Earth Inductor No.9. La Cour pattern I>,H,Z, recording variometers, normal sensitivity ijmm/hour recorder. MACOOARffi ISLMD MAGNETIC OBSERVATORY Oflographic Latitude 5 0's Longitude 58057'E Geomagnetic Latitude -60 Longitude 0 La Cour pattern QHMs Nos.77,78,79. to Gout pattern HUE No.6. La Cour pattern I>,U,Z, recording variometers low sensitivity 5nm/hour recorder. HEARD ISLAND MAGNETIC OBSERVATORY Geographic Latitude 500's Longitude 70'E Geomagnetic Latitude -6o Longitude 9 InatamsHfefl La Cour pattern QHMs Nos.7,7,7. La Cour pattern BUZ No.6. La Cour pattern D,H,Z, recording variometers low sensitivity ijran/hour recorder.

5 . - WAypgRoa Range for lower limit of K-9 is 50 ganmas Day JC K-Sum (). 0 7 i ( ) Indicates doubtful PRELIMIMRY MEAN VALUES OF THE MAGWETIC ELEMENTS FOR JAHUARY WATHEROO - Declination 6.8' west. Horizontal Intensity 85 gammas. Vertical Intensity -5 gammas.

6 MGMElflC K-IMDICES FOB JAHOABI - TOOUKGI Bangs for lower limit of K=9 Is JOO gaininas Day K-Sro X X X X sx X X X X X X X XX i5 l6 l6 8 7 X X X X XX 8 X X X X X XX X X XX? 6 5 X X X X X X X X XX 6 X X X X X X X X XX ' OP THE MAGHETIC ELEMENTS TOR JANUARY TOOUMQI - Declination 9 6.6' east. Horizontal Intensity 796 ganinas. Vertical Intensity -568 gammas.

7 5. -j^msamag-jsmib Range for lower limit of K»9 Is 500 gammas Day ^ Indices !l _ (M:^) (M) 0 a. ()( 5( () () p) ? () ?? , 6 6 I 0 ( ) Indicates doubtful l PBBLIMimRY MEfeM 7ALPES OF THE MGMETIC EMfflSMJS FOR JAmjARlf mcqtiabie ISUMD - Declination O07.O' east Horizontal Intensity 50 gammas. Vertical Intensity -65 gammas.

8 6. MAQMETIC K>IMDICES FOR JAmi&RY - HEABD ISLAim Range for lower limit of K=9 Is 000 gammas Eat K Indices ? ? ^ ^ PRELIMIMHY MEAM VALUES OF THE MGMETIC EIEMEIJTS FOR JAOTARY HEARD ISUM) - Deelimtlon 50 0west. Horizontal Intensity l88 gammas. Vertical Intensity -750 gammas.

9 7. PRINCIPAL MGHETIC STORMS AT mumpoj-mim JAmfiX je^ailat Ended at lafcea^ii Maximum fcmm d b m d h Moderately severe Moderately severe 6 SUDDEN COMMEMCKMENTS AT WATHEROO DURING JAMJABY M z HMM. Tsum. h m Storm Sudden Commencenent PRaciEAL MASMETIC STQIMS AT TOp;AMSI,jmi jq ^AflyAfiX Baffin^. SMsd_at. intensity Mazimxam fejmfls d h m d h December 7 l6 GO 0 Moderate 5 January Moderate Moderate 5 No record obtained for January 6th. Storm In progress at January Moderate 5 SUDDEN COMffiNCEIffiNTS AT TOOLAHBI DURING JANOARY ga lim anee h m Storm Sudden Commencement Polar Sudden Commencement 00 6 Sudden Impulse.

10 e. IONOSPHERIC DAm - VfAIHEROO MEDIAM HOUTlW VALUES 0 Uean MUF Time h'fl ht>f fi'f foe fofi fof fes 000 M000 Km Km Km Mc/s Mc/s Mc/s Mc/s Mc/s , , X K , l ,.0 a Insufficient values.

11 9. lomospherig DAIA - WATHKROO SmotARY SPORADIC E 0 Mean Time l 'centage of tine above Median No. In of Mc/s 5 lie/a Mc/s Mc/p fibs , e , , , 9 _ _ _ , ,8 0 - Indicates zero percentage.

12 0. PI.OYlalOH&L AHIfllAL LMM VALUES OF IJiGIjKTIC ELEilEHTS Month Horizontal Vertical January February " 8,5' 8.' March. 8,0' April 8,' Kay 7.6' June 7,' July - 7,' August 7,5' September - 7,' October. 7.9' November - 7,' December - 7.5' (gammas) (gammas) Mean - 7.7' PhOVIblOH&L ANMJAL MEAM VALUES OF MAGMETIC ELEMENTS TOQLANGI 95 l-onth Declination Horizontal Vertical Intensity IntensltX (gammas) (gammas) January 09.' February 09,' March 09.9" April 09,' May 09.7' June 09. ' July 09,9' August 09 5,' September 09 5,' October ' November 09 6.' December 09 6,' Mean 09,'

13 . PKOVISIOItf.L ^Jjj'aAL ItiiAW VALUES OF filef^mrs Maaib Declination Horizontal Inter^itx. Vertical Intensity (gannas) (gaminas) April Kay June July August September October November December 0 O 0 O O O 0 0«9' 0.7' 0«' 0.9' 0,' 0.7' 05.< 05. T Mean 0.' VALUBiS. OF. tiagiietig timiekis Lfictii Declination Horizontal Intensity (gammas) Vertical Intensity (gammas) April -9 May _AO0 56.5' June ' July -9 56,5' August ' 87-7 September ' October ' November 59.5' l88i -7 December ' 88-7 MSSfl '