Recent Direct Measurements by Satellites of Cosmic Dust in the Vicinity of the Earth

Physics

Scientific paper

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Cosmic Dust, Satellite Observation, Space Probes, Satellite-Borne Instruments, Earth Atmosphere, Space Density, Transducers, Calibrating

Scientific paper

Direct measurements of the space density of cosmic dust particles in the svicinity of the earth have been made from rockets, satellites, and space sprobes. The largest data samples have been obtained from crystal stransducer sensors that detect the impact-impulses occurring from the scollision of dust particles on sensitive surfaces of space vehicles. sPreliminary results from satellite 1959 Eta show: (1) over 1500 impacts sand an area-time product greater than 101O sq cm-sec; and (2) sa daily variation in the dust particle density near the earth. The dust sparticle instrumentation of 1959 Eta and sensor calibration techniques sare discussed in this paper. The results of direct measurements from sspace vehicles prior to 1959 Eta are summarized with respect to 1959 Eta sinformation.

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