Explorer 35 plasma measurements in the vicinity of the Moon


  • E. F. Lyon,

  • H. S. Bridge,

  • J. H. Binsack


The purpose of this note is to report some initial conclusions about the influence of the moon on the flow of charged solar-wind particles. These conclusions are based on early plasma measurements obtained by the M.I.T. Faraday-cup-type detector flown on Explorer 35 (AIMP-E). This satellite was launched July 19, 1967, from Cape Kennedy and was injected into a selenocentric orbit on July 22. The initial orbital parameters in lunar radii are: periselene 1.4, aposelene 5.4; the orbital period about the moon is 11.5 hours.