Magnetic Mapping of the Moon and Mars Using Electron Reflection Magnetometry

Details Magnetic Mapping of the Moon and Mars Using Electron Reflection Magnetometry Magnetic Mapping of the Moon and Mars Using Electron Reflection Magnetometry

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh54a..01l&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH54A-01

Physics

5420 Impact Phenomena (Includes Cratering), 5440 Magnetic Fields And Magnetism, 5443 Magnetospheres (2756), 6225 Mars, 6250 Moon (1221)

Scientific paper

One of the major surprises of the Apollo 15 & 16 lunar missions was the discovery of hundreds of patches of strong remnant magnetization of the lunar crust, ranging from tens to hundreds of km scale size. Most of these regions were mapped through the serendipitously discovered electron reflection (ER) method for remote sensing of surface magnetic fields. Since then electron reflectometers have been flown on the Mars Global Surveyor and Lunar Prospector missions. We present here high sensitivity full global maps of the surface magnetic fields of both planetary bodies. Remarkably strong surface magnetic fields have been detected, especially for Mars. These detailed maps show complex structure, but the origin and history of the magnetization on both bodies still remains a mystery. Impact processes, however, are clearly important in erasing magnetism on both bodies, and may also be involved in producing magnetization on the Moon. Recently, the ER method has been used to probe of the structure of the upper Martian atmosphere. For both the Moon and Mars there is evidence for closed magnetospheres/cylinders at least some of the time, and the interaction of the solar wind with these structures can be complex. Evidence for magnetic reconnection and for non-fluid effects have been found.

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