Abstract

The fluctuation of the acceleration are analysed for several satellites. For the density variations three predominant influences can be distinguished: 1) The varying solar short ultra-violet radiation; 2) The day-night-effect; 3) An annual variation. The latter suggests a significant interaction of the terrestrial upper atmosphere with the interplanetary matter. The annual variation gives some evidence for an interstellar wind due to the solar motion in the local stellar system.

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