Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p11a0353f&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P11A-0353
Other
5420 Impact Phenomena (Includes Cratering), 5440 Magnetic Fields And Magnetism, 5470 Surface Materials And Properties, 6250 Moon (1221)
Scientific paper
The Magnetometer/Electron Reflectometer experiment onboard Lunar Prospector (LP) produced a global map of lunar crustal magnetic fields. The most prominent features of this map are weak surface fields (<0.2 nT) within large impact basins and strong fields (>40 nT) diametrically opposite to these same sites, thus showing the importance of basin forming processes in producing the current distribution of the lunar crustal magnetic fields. The only other clear-cut global correlation is between surface magnetic fields and albedo swirls of the Reiner Gamma class, although recently, the Cayley formation has been shown to correlate with strong surface magnetic fields, suggesting that some Imbrian impact ejecta are magnetized. To conduct a systematic global search for other correlations, we performed cluster analysis of the surface magnetic field intensity, surface topography, and free-air gravity anomalies. This analysis yields five distinct clusters. The two dominant clusters reproduce the strongly magnetic antipodal zones and the previously known correlations between weak surface magnetic fields and impact basins with their associated topographic and gravitational signatures. The remaining three clusters cover the part of the Moon away from the basin impact sites and their antipodes. These clusters comprise strong (>20 nT) magnetic anomalies not antipodal to large impact basins and reveal associations with albedo features and impact ejecta. These groups are also distinguished by their gravitational component.
Frey Sabine
Halekas Jasper S.
Lin Robert P.
Mitchell David Leroy
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