A study of the Rima Sirsalis lunar magnetic anomaly

Details A study of the Rima Sirsalis lunar magnetic anomaly A study of the Rima Sirsalis lunar magnetic anomaly

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pepi...20..281s&link_type=abstract

(Topical Conference on Origins of Planetary Magnetism, Houston, Tex., Nov. 8-11, 1978.) Physics of the Earth and Planetary Inter

Physics

8

Lunar Magnetic Fields, Lunar Surface, Magnetic Anomalies, Magnetization, Apollo 16 Flight, Lunar Geology, Lunar Probes, Magnetic Dipoles

Scientific paper

The source of the lunar magnetic anomaly associated with the Rima Sirsalis linear rille has been modelled using the vector field intensities due to arbitrary uniform magnetization in a rectangular prism. It is shown that in order to match the Apollo 16 subsatellite data, the lunar surface near the rille must have a vertical magnetization of 6,000-9,000 G if the anomaly is due to flux leakage from a gap in the crust with the dimensions of the rille. An alternative explanation is that Rima Sirsalis and its surroundings are the site of a vertical magnetization contrast of 100,000-10,000 G which is at least as wide as the rille and extends to a depth of tens of kilometers in the crust. A wider magnetic source reduces the required magnetization (or depth) proportionately, since to first order the field at high altitude is proportional to the magnetic dipole moment per unit length.

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