Direct measurement of the plasma screening length and surface potential near the lunar terminator

Details Direct measurement of the plasma screening length and surface potential near the lunar terminator Direct measurement of the plasma screening length and surface potential near the lunar terminator

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.1917b&link_type=abstract

Journal of Geophysical Research, vol. 82, May 1, 1977, p. 1917-1920.

Physics

7

Electric Potential, Lunar Surface, Plasma Diagnostics, Screening, Terminator Lines, Apollo 14 Flight, Debye Length, Energy Spectra, Plasma Density, Plasma Temperature, Potential Energy, Solar Wind, Surface Energy

Scientific paper

Direct measurement of the lunar dayside surface potential and screening length has been made by the suprathermal ion detector experiment (Side) near the terminator. In a region 20-30 deg from the terminator at the Apollo 14 and 15 sites the surface potential is found to be approximately 50 V negative, and the screening length to be about 1 km. This value of the screening length is more than 2 orders of magnitude greater than the solar wind 'Debye' length. The strong negative surface potential in this region may be due to enhanced temperature and density of the solar wind plasma.

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