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The moon

, Volume 8, Issue 1–2, pp 115–128 | Cite as

Observations of water vapor ions at the lunar surface

  • J. W. FreemanJr.
  • H. K. Hills
  • R. A. Lindeman
  • R. R. Vondrak
Article

Abstract

The Apollo 14 Suprathermal Ion Detector Experiment observed a series of bursts of 48.6 eV water vapor ions at the lunar surface during a 14-h period on March 7, 1971. The maximum flux observed was 108 ions cm−2 s−1 sr−1. These ions were also observed at Apollo 12, 183 km to the west. Evaluation of specific artificial sources including the Apollo missions and the Russian Lunokhod leads to the conclusion that the water vapor did not come from a man-made source. Natural sources exogenous to the Moon such as comets and the solar wind are also found to be inadequate to explain the observed fluxes. Consequently, these water vapor ions appear to be of lunar origin.

Keywords

Water Vapor Solar Wind Natural Source Lunar Surface Detector Experiment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1973

Authors and Affiliations

  • J. W. FreemanJr.
    • 1
  • H. K. Hills
    • 1
  • R. A. Lindeman
    • 1
  • R. R. Vondrak
    • 1
  1. 1.Dept. of Space ScienceRice UniversityHoustonUSA

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