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This report summarises the data from the Mawson Geomagnetic Observatory from January 1989 to December1989 inclusive. Daily and hourly averages of each of the standard geomagnetic components (X, Y, Z, F, H, D and I) are given foreach month for all days, international quiet days and international disturbed days. The monthly average mean-hourly-values on international quiet days are graphed to show any regularity in diurnal variation and its changethroughout the year. The recording systems and absolute calibrations of the data are described in detail in the Mawson GeophysicalObservatory Annual Report, 1989 (Crosthwaite, 1991).

This report presents the results of geomagnetic measurements made at two repeat stations off the coast of Kemp Land Antarctica in October 1989, and at nine repeat stations in the northern Prince Charles Mountains, and Mac Robertson Land Antarctica in January and February 1990. From five to fifty sets of declination, inclination and total field observations (and sunshots to determine azimuth references) were made at each station. The repeat stations are within 500 km of the Mawson Geomagnetic Observatory.

The work described in this report was part of the Bureau of Mineral Resources' contribution to the 1988 Australian National Antarctic Research Expedition. The period of data covered in this report is from 00:00UT 01-01-1988 to 23:59UT 31-12-1988.

This report describes the operation of the Mawson geophysical observatory for 1990. The observatory continuously records the geomagnetic field and global seismic activity at Mawson, and was part of the Bureau of Mineral Resources (BMR) contribution to the Australian National Antarctic Research Expeditions (ANARE). The period covered by this report is from 1 January 1990 to 30 November 1990.