Double floating probe measurements on S3-A.

Model calculations are made to explain the behavior of the potential of a pair of symmetrical floating probes used for the measurement of dc electric fields inside the plasmapause on the S3-A satellite launched on Nov. 15, 1971, into an eccentric orbit. Data representing the behavior of three regions of the plasmapause on and around Dec. 17, 1971, are discussed. The behavior of the plasmapause is found to be generally similar to that determined by previous observations involving variable magnetic activity.