GEOPHYSICAL OBSERVATORY REPORT

Transcription

1 COMMONWEALTH OF AUSTRALIA DEPARTMENT OF NATIONAL DEVELOPMENT BUREAU OF MINERAL RESOURCES. GEOLOGY AND GEOPHYSICS GEOPHYSICAL OBSERVATORY REPORT VOL 2 NO 10 OCTOBER 1954 Issued under the authority of Senator The Hon. If. H. Spooner, Minister for National Development

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

3 C O N T E N T S Subject Contributing Observatories 3tic K-Indlces Preliminary Monthly Mean Values of the Magnetic ElementB Principal Sudden 3tlc Storms, snts Ionospheric Data, Watheroo Provisional Aurorae Principal for 1953 Sudden 1953 of tic Storms for Watheroo Toolangi Macquarie I Heard Island Watheroo Toolangi Macguarie Island Heard Island Watheroo Toolangi Median Hoiirly Vali Sproadic E. Macgxmrie Island Heard Island Macguarie Island Heard Island Macguarie island Heard Island page iu Unless otherwise stated all times are given in Greenwich The terminology used in this report is that accepted by international convention^ Should father information be required, eaqilanation can be obtained by applying tos- Chlef OeophyBlcist, Bureau of Mineral Resourcesj Geology and Geoidiyslcs, k85 Bourke Street, Melbourne, C.1. AUSTRALIA.

4 2. CONTRIBUTING OBSERVATORIES WATHEROO MAGI^ETIC OBSERVATORY A. P. TILLOTT, Observer In Charge. Geographic Latitude 30 19'S Longitude 'E Geomagnetic Latitude Longitude Magnetic Equipment - Instruments Askania pattern Magnetometer No , D.T.M. C. I.W. Earth Inductor No. 2. EBchenhagen pattern D,H,Z, recording variometers, normal sensitivity, 20mm/hour recorder. La Cour pattern D,H,2, recording variometers, normal sensitivity quick run (l80mm/hour) recorder. Ionospheric Equipment - C.S.I.R.0. pattern 1-16Mc/s Sweeptlme 2 minutes. TOOLANGI MAGNETIC OBSERVATORY P.B. TENNI, Observer In Charge. Geographic Latitude 37 32'S Longitude 1i^5 28'E Geomagnetic Latitude -^ Longitude Instruments Ruska pattern Magnetometer No.i4.8'13. Schulze Earth Inductor No.i ^9. La Covr pattern D,H,Z, recording variometers, normal sensitivity recorder. MACQUARIE ISLAND MAGNETIC OBSERVATORY C.S. ROBERTSON, Observer in Charge. Geographic Latitude 5i4. 30'S Longitude 'E Geomagnetic Latitude -61 Longitude 2^4.3 Instruments La Cour pattern QHMs Nos.177,178,179. La Cour pattern BMZ No. 6^4.. La GOVT pattern D,H,2, recording variometers low sensitivity 15mm/ho\ir recorder. HEARD ISLAND MAGNETIC OBSERVATORY K.B. LODWICK, Observer in Charge. Geographic Latitude 53 02'S Longitude 'E. Geomagnetic Latitude -61 Longitude 129 Instruments La Cour pattern QHMs Nos. 172,173,17^4-. La Co\ir pattern BMZ No. 62. La Co\ir pattern D,H, Z, recording variometers lowsensitivity 15rnm/ho\ir recorder.

5 3. MAGHETIC K-INDICE3 FOR OCTOBER - WATHEROO Range for lower limit of K=9 is 350 gammas Day K-Indioes K-Sum u U 3 U U U U 2U k U U (2) (2) U U X XX U k (3) U U (21) U 2 U (2) (07) U U h u U u 3 3 U U k u u U u u 2k 0 Doubtful. PRELIMINARY MEAN VALUES OP THE MAGKCTIC ELEMENTS FOR OCTOBER WATHEROO - Declination 2 U5.7' west. Horizontal Intensity gammas. Vertical Intensity gammas.

6 4. MA&METIC K-IKDIGES FOR QGTOBEK - TOOLAMQI Range for lower limit of K=9 is 500 garamas Day K- Indices K-Sum ^ 3 k k 5 3 k k ' k k k 32 2k X X X X X XX k ffieliminahy MEAN VALUES OF THE MAGMETIC BLEMKHTS FOR OCTOBER TOOLAKGI - Declination ' east. Horizontal Intensity gammas. Vertical Intensity -56J28 gammas.

7 5. Range for lower limit of K=9 is 1500 gammas Dajr K-Indices K-Stun Oil i ^k U U 6 k U U U U U k PRELIMINARY MEAN VALUES Qg THE MAGMETIG SLaiBM!S FOR OCTOBEB MACQUAHIE ISLAUD - Declination 2U 30.1' east. Horizontal Intensity gammas. Vertical Intensity -6i<.515 gaimiab,

8 6. MA&METIC K-IHDIOES FOR OCTOBER - HEARD ISLAND Range for lower limit of K=9 is 1000 gammas K- Indices K-Sum 1 3 k k X X X X X XX 5 X X k 3 XX X XX 8 X X 0 X X X X X XX 9 X X XX ^k ^k k k k 3 k k k k X X XX 23 X X XX 2k k k X XX 27 X X XX k k k PRELIMIMAKY MEAN VALUES OP THE MAGNETIC ELEMENTS FOR OCTOBER HEARD ISLAHD - Declination 50 2i4.. 7' west. Horizontal Intensity ^8k^3 gammas. Vertical Intensity -^17320 gammas» NOTE:- The Heard Island station will be closed at the beginning of 1955> and scientific observations ceased 31st October, 195^4- A new magnetic observatory will be erected at Mawson next year and as soon as the instrimients are installed magnetic data will be piiblished in this bulletin.

9 7. PRINCIPAL MAGIilETIC STORMS A3? WATHEROO DURIMG OCTOBER Began at Ended at Intensity Maximum a h m d h K-Index Moderate Moderate kl Minor activity only. SUDDEN OOMMENCBMKNTS AT WATHEROO DURING OCTOBER Day Time Type h m U Polar Sudden Commencement Small initial inqpuloe followed by main impulse U7 Storm Sudden Commencement. PRINCIPAL MAGNETIC STORMS AT TOOLANQI DURING OCTOBER Began at d h m Ended at d h Intensity Maximum K-Index Moderate Moderate Moderate Moderate 5 SODDEN 00MMEN0BMENT3 AT TOOLANGI DURING OCTOBER ^iz Time TgBgh m U6 Storm Sudden Commencement. Minor activity only.

10 8. IONOSPHERIC D A T A - WATHEROO MEDIAN HOURLY V A L U E S 120 Mean Time hgl Km hpf2 h'p2 Km Km foe fop1 Mc/s Mc/s fof2 Mc/s fes Mc/s MUF 3000 Mc/s Ok J * 320 3kO ,h k J 6, i U U I6.U i I8.U U J, l6.i J J4O i ,7 3.6 U.0 U.3 U.3 k.5 k.5 J i M Indicates fes m e d i a n b e l o w lowest frequency recorded. X Denotes insufficient v a l u e s.

11 9. lonospheeic DATA - WATHEROO SUMMARY SPORADIC E 120 Median No, Mean percentafie of time above in of Time 7 Mc/s 5 Mc/s 3 Mc/s Mc/s Ob _ Ok _ k , _ - 3, _ (95) (1G) _ 10 (86) (2G) _ U 20(2G) 15 _» (62) 21 (3G) h2 2, _ _ _ k _ Indicates fes median below lowest freq^uency recorded, - Indicates zero percentage, G Signifies fesfoe>3. 0 Mc/s,

12 10. PEOVISIONAL SUMMARY OP AURORAS FOR OCTOBER Reported by and published throxigh the courtesy of the Australian National Antarctic Research Expedition, Day Cloud First Cover Seen h m Time of Maximum h m MACQUARIE Last Seen h m ISLAM) Time Intensity Remarks End h m unknown 3 Daylight overhead OU k5 10 uo 2 Ok k unknown 2 Daylight overhead k unknown U Daylight overhead Overhead unknown unknown k5 unjmown unknown 3 Overhead unknown U Daylight overhead 2k UO) 16 35) 16 UO unknown U Overhead unknown k HEARD ISLAND Day Cloud First Time of Last Time Cover Seen Maximum ^en End h m h m h m h m Intensity Remarks 03 U U5 2k k unknown unknown untoiovm 2

13 11. PRINCIPAL MASKETIC STORMS AT 1IM.CQUARIE I3LAMD 1953 Month Besan at Ended at Intensity Maxin d h m d h K-Inc January i Moderately severe Moderate «30 20 Severe 8 February Moderately severe 7 March Severe * «10 20 Moderately severe »» Severe 8 April OU 23 Moderately severe Moderately severe Severe uo Moderately severe 7 May Moderately severe ito Severe Moderately severe 6 June Moderately severe Moderately severe Moderately severe 7 July k 10 Moderately severe UO Moderately severe 7 August k 00 Moderately severe k Severe 8 September Moderately severe k 20 Severe 8 October UU Severe Moderately severe 7 November Moderately severe k 10 Moderately severe 7 December Moderately severe 7

14 12. PRINCIPAL MAGNETIC STORMS AT HEARD ISLAND 1953 Month Began at Ended at intensity Maxir d h m d h K-Inc January Moderately severe Moderate 5 2k k 2k Moderate 5 25 Ok Moderately severe 7 Petruary k Severe 8 March Ok Ok Ok Severe Ok Severe Moderately severe Severe 9 April Oi; 2k Moderately severe Ok Severe k 01 Moderately severe 6 May Ok Moderately severe 7 li; Severe 9 Jvme Moderately severe Moderately severe 7 July Severe Moderately severe 6 August Period of record missing k Severe Moderately severe 7 September Severe Moderately severe Severe 8 OctolDer k Severe Moderately severe 7 November Moderately severe k 12 Moderately severe 7 December Moderately severe 7

15 13. SUDDEN COMMENCaMTS AT MACQUARIE ISLAND DURING 1953 Month Day Time V, lu -January Storm Sudden Commencement February ou Polar Sudden Commencement March Polar Sudden Commencement April Polar Sudden Commencement Polar Sudden Commencement 19 i1 50 Polar Sudden Commencement 2h Polar Sudden Gommencement Polar Sudden Commencement Polar Sudden Gommencement Polar Sudden Commencement May k Polar Sudden Gommencement June Polar Sudden Commencement Polar Sudden Commencement Polar Sudden Commencement Polar Sudden Gommencement 26 Ak 26 Polar Sudden Commencement Polar Sudden Commencement July Polar Sudden Commencement 10 1i M Polar Sudden Commencement Polar Sudden Commencement i Polar Sudden Gommencement Polar Sudden Commencement 2h Polar Sudden Commencement August Polar Sudden Commencement Polar Sudden Commencement k Storm Sudden Commencement Polar Sudden Commencement September Polar Sudden Commencement h3 Polar Sudden Commencement Storm Sudden Commencement Polar Sudden Commencement October Polar Sudden Commencement Polar Sudden Commencement Polar Sudden Commencement Polar Sudden Gommencement Polar Sudden Commencement Storm Sudden Commencement Zk Polar Sudden Commencement Polar Sudden Commencement November Polar Sudden Commencement Polar Sudden Commencement Oit Polar Sudden Commencement OU Polar Sudden Commencement Polar Sudden Commencement Polar Sudden Commencement Polar Sudden Commencement Polar Sudden Gommencement Polar Sudden Commencement Polar Sudden Commencement December Polar Sudden Commencement Polar Sudden Commencement Polar Sudden Commencement Polar Sudden Gommencement

16 Month 2i Time Type h m January Polar Sudden Commenoement Polar Siidden Sudden Commenoement Conanenoement pebr\iary ks Polar Sudden Commencement Polar Sudden C Goiranencenient ommencement March Polar Sudden Commencement April Polar Sudden Commencement Polar Sudden Commencement Polar Sudden Commencement May Oh Polar Sudden Commencement Polar Sudden Commencement 2k Polar Sudden Commencement Jime tjvalavrf 13 I ^ 17 i 7 k5 Polar Sudden Commencement polar Sudden Commencement Polar Polar Sudden Commencement polar Sudden Commencement Jiily jiily Polar Sudden Sudden Commencement Commencement Polar Sudden Commencement Storm Sudden Commencement Polar Sudden Commencemsnt August h2 Polar Sudden ComnKncement U ^ Storm Sudden Commencement Septenfljer U8 Polar Sudden Commencement 06 M Polar Sudden Commencement 15 (03 00) Storm Sudden Commencement Polar Sudden Commencement October Ocfeoter Polar Sudden Commencement U5 Storm Sudden Commencement Polar Sudden Commencement November Polar Sudden Commencement Polar Sudden Commencement Commenoement Sudden Commencement Polar polar Sudden Comnsncemsnt Comnenoement Polar Sudden Commencement December polar Sudden Commencement Commenoement polar Sudden Commenoement ncement Polar Sudden Commencement Polar Sudden Commencement s Ho record due to trace change tut possible atom Sudden Commencement confirmed Ijy other observatories.