Summary
Digital magnetometer data have been collected from Davis (68.58°S, 78.0°E) since 16 February 1988 and from Casey (66.28°S, 110.5°E) since 17 January 1989. The processing of the variometer data from Casey has been transferred to the Australian Geological Survey Organisation (AGSO) from 1 January 1999. This paper reports on the processing of the Casey data to the end of 1998, the processing of the Davis data to the end of 1999, the processing software and models used, the known, suspected and possible influences on the station baselines, and the reports that exist covering the period of Australian Antarctic Division responsibility for the Davis and Casey variometer data reduction. Emphasis is given to the baseline determinations for the 1997 to 1999 interval at Casey and Davis stations and the insights that these give, in association with previous results. Intervals when unprocessed Macquarie Island (54.50°S, 159.0°E: 7 September 1987 to 4 January 1994) and Mawson (67.60°S, 62.9°E: 8 January 1991 to 19 January 1994) were collected by arrangement with AGSO, are also noted.