Suprathermal ions near the Moon

  • Freeman J
  • Fenner M
  • Hills H
 et al. 
  • 2


    Mendeley users who have this article in their library.
  • 14


    Citations of this article.


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.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


  • J. W. Freeman

  • M. A. Fenner

  • H. K. Hills

  • R. A. Lindeman

  • R. Medrano

  • J. Meister

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free