Secondary electron emission induced by gas and dust impacts on Giotto, Vega-1 and Vega-2 in the environment of Comet Halley

Details Secondary electron emission induced by gas and dust impacts on Giotto, Vega-1 and Vega-2 in the environment of Comet Halley Secondary electron emission induced by gas and dust impacts on Giotto, Vega-1 and Vega-2 in the environment of Comet Halley

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250c.327g&link_type=abstract

In its Proceedings of the 20th ESLAB Symposium on the Exploratio of Halley's Comet. Volume 3: Posters p 327-331 (SEE N87-26714 2

Computer Science

Cosmic Dust, Cosmic Gases, Hypervelocity Impact, Plasma Density, Plasma Probes, Secondary Emission, Cometary Atmospheres, Giotto Mission, Spacecraft Charging, Sputtering, Vega Project

Scientific paper

Giotto, Vega-1 and Vega-2 have been bombarded by a flow of gas and dust particles during their flyby of comet Halley. The emission of secondary electrons and sputtered ions caused by the large impact velocities (70 - 80 km/s) perturbed the plasma density in the spacecraft vicinity and was a possible source of interference for field and particle measurements. Identical impact plasma detectors were mounted on the three space probes; the saturation currents of secondary electrons emitted from gold targets were measured once per second. The results obtained during the three flybys are presented and compared. Information about the gas density profile and nucleus gas production rate can be derived from the measurements. Conclusive evidence is given about the time of opening of the cover which protected the Giotto target from contamination by the spacecraft propulsion system.

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