Observations of moon-plasma interactions by orbital and surface experiments

Physics – Space Physics

Scientific paper

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Interplanetary Magnetic Fields, Lunar Magnetic Fields, Lunar Orbits, Lunar Surface, Plasma Interactions, Solar Wind, Cosmic Plasma, Explorer 35 Satellite, Geomagnetic Tail, Magnetic Measurement, Magnetic Signatures, Magnetosheath, Orbital Elements, Plasma Diagnostics, Remanence

Scientific paper

Extensive magnetic field observations together with crucial plasma measurements by the Explorer 35 lunar orbiter and Apollo surface and orbital experiments have established the basic nature of the moon's interaction with the solar wind and interplanetary magnetic field. The effective absorption of the incident solar wind by the moon creates a plasma void or cavity behind the moon. The cavity-associated magnetic signature is characterized by an enhancement in magnetic field magnitude B within the cavity as compared with the mean level of B in the surrounding interplanetary plasma and dips or decreases in B near the cavity boundaries with the solar wind. Apollo particle and field measurements on the lunar surface have provided evidence of a regional interaction of the highly conducting solar wind with lunar remanent magnetic fields. Simultaneous plasma and magnetic field data, from the spectrometer and the lunar surface magnetometer at the Apollo 12 location, show the compression of the local remanent field by large solar wind and magnetosheath plasma dynamic pressures.

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