Microparticles in the geostationary orbit (GORID experiment)

Details Microparticles in the geostationary orbit (GORID experiment) Microparticles in the geostationary orbit (GORID experiment)

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adspr..23..123d&link_type=abstract

Advances in Space Research, Volume 23, Issue 1, p. 123-133.

Physics

9

Scientific paper

A Cosmic Dust/Space Debris detector was launched in September 1996 into geostationary orbit (GEO) as a piggyback instrument on the Russian Express-2 telecommunications spacecraft. The instrument consists of a plasma type detector and associated electronics and is essentially identical to the dust detectors flying on the Ulysses and Galileo spacecraft. The aperture size is 0.1 m2 and the instrument is capable of detecting particles with a mass down to 10-14 g (velocity dependent). The detector is stationed at 80° Eastern longitude. It has a fixed viewing direction which is 65° away from the flight direction towards North. The extracted parameters include particle mass, velocity and crude impact direction. To some extent, orbital debris and natural meteoroids can be separated by the impact velocity which at the GEO altitude is typically below 5 km/s for debris and higher for meteoroids. GORID is in normal operation since mid April 1997. As of early May 1998, 591 events were recorded which most likely are true impacts and many more potential impact events. The number of impacts per day ranged from 0 to 19. The majority of impacts occurred during local night times. About half of the recorded impacts apparently carried a high negative charge of up to 10-9 C when they entered the detector, a surprising finding which requires further analysis. The design life of the Express satellite is 5 to 7 years.

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