Physics
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975moon...14...71p&link_type=abstract
(Lunar Science Institute, Conference on Interactions of the Interplanetary Plasma with the Modern and Ancient Moon, Lake Geneva,
Physics
1
Earth-Moon System, Geomagnetic Tail, Lunar Orbits, Magnetospheric Electron Density, Magnetospheric Proton Density, Electron Energy, Explorer 35 Satellite, Gravitational Effects, Interplanetary Magnetic Fields, Lunar Surface
Scientific paper
Results are summarized for a study of plasma-sheet particles (and their flow) encountered by the moon during its passage through the geomagnetic tail. The study is based on analysis of data obtained with a modulated Faraday cup on board the lunar-anchored spacecraft Explorer 35. It is shown that the electrons have a rapidly fluctuating non-Maxwellian energy distribution with a mean energy of several hundred electron volts and a density of approximately 0.2 per cu cm. Protons with energies of the order of 1 keV were usually detected above the instrument background when flowing towards earth at about 200 km/sec. It is suggested that strong terrestrial polar winds during the early history of the earth-moon system could have caused some erosion of the front side of the moon and that the relative smoothness of the same side could be explained in terms of gravitational shielding by the earth from the interplanetary rock flux.
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