Electron emission by gas and dust impacts during the flybys of Comet Halley

Details Electron emission by gas and dust impacts during the flybys of Comet Halley Electron emission by gas and dust impacts during the flybys of Comet Halley

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..877g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, Aug. 1986, p. 877-879.

Astronomy and Astrophysics

Astronomy

3

Electron Emission, Halley'S Comet, Interplanetary Dust, Molecular Gases, Particle Collisions, Space Plasmas, Current Density, Spaceborne Astronomy, Vega Project

Scientific paper

The space probes which flew through the environment of comet Halley have been bombarded by a flow of molecules and dust particles which impacted their surface with a relative velocity of the order of 70 - 80 km s-1. The emission of secondary electrons and sputtered ions caused by these impacts was a potential source of interference for the experiments which analyzed the gas and plasma environments of the comet. The impact plasma detector is a simple device which measured the saturation current of the secondary electrons emitted from a gold target mounted on Vega-1 and Vega-2. The effects of the gas and dust impacts can be easily separated; the total gas production rate of the nucleus is estimated to be of the order of 1030 molecules/s at 0.8 AU.

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