Mawson is an Australian National Antarctic Research Expedition base on the Antarctic mainland managed by the Australian Antarctic Division. Geomagnetic and seismological recording and processing equipment was maintained and calibrated by an observer provided by the Australian Geological Survey Organisation (AGSO) during 1994. Earthquake phase data was reported weekly to AGSO and to the National Earthquake Information Service (Boulder, Colorado) via email. Magnetic results were reported monthly to AGSO, and to the French Department de Geomanetisme et Paleomagnetism for use in the Oersted magnetic satellite project. Magnetic results indicate the secular variation of the field at Mawson was relatively unchanged over the year, with a three nanoteslas decrease in total intensity and a 5.5 minute increase in westerly declination. Magnetic data recorded at the Casey and Davis Antarctic bases was processed by the Mawson observer and indicated similar relative stability.

Fourteen Australian magnetic repeat stations were occupied during1993 and 1994. The secular variation and geomagnetic field data from the repeat stations will be used for the 1995.0 Australian Geomagnetic Reference Field (AGRF) model, and for global magnetic field models. The repeat stations occupied were at Norfolk Island, Lord Howe Island, Maryborough, Hobart, Flinders Island, Parafield, Toolangi,Tibooburra, Gove, Weipa, Mt Isa, Eucla, Carnegie and Derby. The magnetic field was monitored by a three component fluxgate variometer and a total field magnetometer, and the data recorded asone minute means onto a portable computer. The recordings were calibrated to magnetic observatory standard.

Legacy product - no abstract available

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An airborne magnetic and radiometric survey of the LAVERTON and EDJUDINA 1:250,000 map areas was flown in 1966 to assist the systematic regional geological mapping of the Western Australian Precambrian Shield, and the search for metals. Virtually the entire magnetic pattern is attributed to differences in magnetic properties between rock units at or near ground level. Geological strikes and the boundaries of major rock units have been interpreted by delineating magnetic trends, by subdividing the area into zones of specified magnetic character, and by assessing the geological significance of these zones by reference to mapped geology.

This paper analyses the magnetic field differences between the Gnangara and Gingin geomagnetic observatory sites. It was first presented as a poster at the XVth IAGA Workshop on Geomagnetic Observatory Instruments, Data Acquisition and Processing in San Fernando, Spain, 4-14 June 2012. It will be submitted as an extended abstract for the workshop proceedings volume.

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This report describes the operation of the Mawson geophysical observatory from December 1990 to December 1991. It includes a summary of Mawson geomagnetic data from 1 December 1990 to 12 December 1991. It also describes work carried out in compiling variometer data and absolute observations from Davis and Casey, provided by the Auroral and Space Physics section (ASP) of the Antarctic Division (formerly Upper Atmosphere Physics, UAP) to produce mean monthly averages of the quiet field in the manner of the Mawson reports. Geomagnetic field observations performed in the Prince Charles Mountains (PCMs) and on Heard Island during January and February 1992 are presented in a separate report (de Deuge, 1992).

During 1999 the Australian Geological Survey Organisation (now Geoscience Australia) operated geomagnetic observatories at Alice Springs and Kakadu in the Northern Territory, Canberra in the Australian Capital Territory, Charters Towers in Queensland, Gnangara and Learmonth in Western Australia, Macquarie Island, Tasmania, in the sub-Antarctic, and Mawson in the Australian Antarctic Territory. This report describes instrumentation and activities, and presents monthly and annual mean magnetic values, plots of hourly mean magnetic values and K indices at the magnetic observatories and repeat stations operated by GA during calendar year 1999.