Global spherical harmonic models of the internal magnetic field of the Moon based on sequential and coestimation approaches

Details Global spherical harmonic models of the internal magnetic field of the Moon based on sequential and coestimation approaches Global spherical harmonic models of the internal magnetic field of the Moon based on sequential and coestimation approaches

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgre..11512007p&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue E12, CiteID E12007

Physics

4

Planetary Sciences: Solid Surface Planets: Magnetic Fields And Magnetism, Planetary Sciences: Solid Surface Planets: Impact Phenomena, Cratering (6022, 8136), Planetary Sciences: Solid Surface Planets: Interactions With Particles And Fields, Planetary Sciences: Solid Surface Planets: Interiors (8147), Planetary Sciences: Solid Surface Planets: Tectonics (8149)

Scientific paper

Three new models of the global internal magnetic field of the Moon based on Lunar Prospector (LP) fluxgate magnetometer observations are developed for use in understanding the origin of the Moon's crustal magnetic field and for modeling its interaction with the solar wind. The models are at spherical harmonic degree 170, corresponding to 64 km wavelength resolution, from 30 km mean altitude LP observations. Coverage is complete except for a few areas near each pole. Original signal amplitudes are best preserved in the sequential approach map, whereas feature recognition is superior in the coestimation and harmonic wave number correlation maps. Spherical harmonic degrees less than 15, corresponding to 666 km wavelength, are largely absent from the Moon's internal magnetic field. We interpret this bound in terms of the Moon's impact history. A derived magnetization map suggests magnetizations may locally exceed 0.2 A/m in the lunar crust at the survey resolution if the magnetic crust is as thick as 40 km.

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