Estimates of a spacecraft induced gas cloud and its effects on measurement of ambient particles during a fast flyby of Comet Halley

Details Estimates of a spacecraft induced gas cloud and its effects on measurement of ambient particles during a fast flyby of Comet Halley Estimates of a spacecraft induced gas cloud and its effects on measurement of ambient particles during a fast flyby of Comet Halley

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982giot.rept...35y&link_type=abstract

In ESA GIOTTO Spacecraft Gas and Plasma Environ. p 35-46 (SEE N82-25962 16-75)

Computer Science

Comet Nuclei, European Space Programs, Flyby Missions, Halley'S Comet, Neutral Gases, Outgassing, Aluminum, Gas-Gas Interactions, Ion Production Rates, Sputtering, Vaporizing

Scientific paper

The possibility of a large gas cloud being induced around the GIOTTO spacecraft by particle sputtering, outgassing, and dust impact vaporization on the ram direction surface is considered. Analogy with Earth orbiting satellites and predictions of models of the GIOTTO gas environment and Halley coma suggest that a cloud will form, leaving the shield surface at low velocities relative to the 69 km/sec flyby velocity. It becomes compressed between the coma gas and the satellite. Cometary neutral gas can in turn collide inelastically with the GIOTTO cloud, producing spurious ionization and dissociation of cometary material. This amounts to 10% of the total ambient ion flux at 1000 km from cometary nucleus. The apogee boast motor cover shield should be closed as late as possible, allowing maximum time for outgassing of the burnt out motor. Gold thickness on the shield should be increased to 50 microns in order to reduce the amount of aluminum vapor produced by dust impact.

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