Suprathermal ions near the Moon

  • Freeman J
  • Fenner M
  • Hills H
 et al. 
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Abstract

This paper reports some preliminary results from the Suprathermal Ion Detectors deployed on the lunar surface by the Apollo 12 and 14 astronauts. Salient features of these results include: the possible observation of sporadic venting of gas from the lunar surface; evidence for a prompt ionization and acceleration mechanism operating in the lunar exosphere; and a preliminary measurement yielding approximately 1 month for the e-folding decay time for the heavier components of the exhaust gases from the Apollo lunar landing systems. Prominent phenomena from which these results have been derived are: (1) ion bursts of low to moderate energy seen in conjunction with lunar sunrise and sunset; (2) solar wind energy ions detected on the night side of the Moon; (3) ions of several keV energy seen during the lunar sunset to midnight quadrant of the Moon's orbit; (4) magnetosheath ion flux enhancements; (5) ion bursts generated by the lunar impact of the Apollo 13 Saturn upper stage and other man-made objects; and (6) geomagnetic storm associated ion flux variations in the Earth's magnetotail. © 1972.

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Authors

  • J. W. Freeman

  • M. A. Fenner

  • H. K. Hills

  • R. A. Lindeman

  • R. Medrano

  • J. Meister

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