On the occurrence of magnetic enhancements caused by solar wind interaction with lunar crustal fields

Details On the occurrence of magnetic enhancements caused by solar wind interaction with lunar crustal fields On the occurrence of magnetic enhancements caused by solar wind interaction with lunar crustal fields

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3308106h&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 8, CiteID L08106

Physics

9

Magnetospheric Physics: Solar Wind Interactions With Unmagnetized Bodies, Planetary Sciences: Solid Surface Planets: Interactions With Particles And Fields, Planetary Sciences: Solid Surface Planets: Magnetic Fields And Magnetism, Planetary Sciences: Solid Surface Planets: Magnetospheres (2756), Planetary Sciences: Solar System Objects: Moon (1221)

Scientific paper

We use Lunar Prospector data to identify 990 magnetic enhancements, previously termed ``limb shocks'' or ``limb compressions'', external to the lunar wake. We find that they are clearly associated with lunar crustal sources, and sometimes occur far upstream from the limb at altitudes of ~100 km. This is inconsistent with compressional disturbances convecting downstream with the solar wind, and implies that crustal fields are sometimes strong and coherent enough to produce a fluid-like interaction where compressional waves steepen to form a shock extending upstream from their source. The likelihood of observing enhancements partly depends on upstream solar wind conditions, with low proton gyroradius and low β particularly favored. Low Mach numbers, implying a larger shock standoff distance, are also favored for observations which suggest shock-like behavior.

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