Surface mapping of three components of the lunar magnetic anomaly field: Preliminary results

Details Surface mapping of three components of the lunar magnetic anomaly field: Preliminary results Surface mapping of three components of the lunar magnetic anomaly field: Preliminary results

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmgp43b1060t&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #GP43B-1060

Physics

[1595] Geomagnetism And Paleomagnetism / Planetary Magnetism: All Frequencies And Wavelengths, [5440] Planetary Sciences: Solid Surface Planets / Magnetic Fields And Magnetism, [6250] Planetary Sciences: Solar System Objects / Moon

Scientific paper

Mapping of the lunar magnetic anomaly gives a crucial constraint on the crustal magnetization structure of the Moon. High spatial resolution of the magnetic anomaly map requires low altitude mapping. We have developed a new method for mapping three components of the lunar magnetic anomaly field on the lunar surface using magnetic field observations by a satellite magnetometer. This surface mapping method was applied to the datasets of several lunar magnetic anomaly regions observed by Lunar Prospector and Kaguya. We will report their preliminary results. The radial component of the crustal magnetic field (Br) on the surface can be obtained from the satellite observations at various altitudes through the inversion of a boundary value problem (Tsunakawa et al., in press). In our method, surface Br values are mapped at almost equal interval points, called generalized spiral points. Two horizontal components are calculated at each point from Br values at the adjacent points. Thus we can map the surface values of three components and total intensity of the lunar magnetic anomaly field (Tsunakawa et al., in prep.). We have applied the method to several strong anomaly regions (e.g. Reiner Gamma) observed by Lunar Prospector and Kaguya. Since the observation altitudes are mostly 15-45 km, spatial resolutions are estimated to be 0.5-1 degree. Preliminary results show strong magnetic anomaly fields with intensity peaks of more than 500 nT on the lunar surface.

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