An equivalent source model of the satellite-altitude magnetic anomaly field over Australia

Details An equivalent source model of the satellite-altitude magnetic anomaly field over Australia An equivalent source model of the satellite-altitude magnetic anomaly field over Australia

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..51..189m&link_type=abstract

Earth and Planetary Science Letters, vol. 51, no. 1, Nov. 1980, p. 189-198.

Computer Science

Sound

5

High Altitude Environments, Magnetic Anomalies, Magnetic Field Configurations, Magnetic Measurement, Magnetization, Australia, Curve Fitting, Dipole Moments, Geomagnetism, Least Squares Method, Magnetic Moments, Satellite Sounding, Tectonics

Scientific paper

The low-amplitude, long-wavelength magnetic anomaly field measured between 400 and 700 km elevation over Australia by the POGO satellites is modeled by means of the equivalent source technique. Magnetic dipole moments are computed for a latitude-longitude array of dipole sources on the earth's surface such that the dipoles collectively give rise to a field which makes a least squares best fit to that observed. The distribution of magnetic moments is converted to a model of apparent magnetization contrast in a layer of constant (40 km) thickness, which contains information equivalent to the lateral variation in the vertical integral of magnetization down to the Curie isotherm and can be transformed to a model of variable thickness magnetization. It is noted that the closest equivalent source spacing giving a stable solution is about 2.5 deg, corresponding to about half the mean data elevation, and that the magnetization distribution correlates well with some of the principle tectonic elements of Australia.

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