Electrostatic charging of the GIOTTO spacecraft due to neutral gas impact

Details Electrostatic charging of the GIOTTO spacecraft due to neutral gas impact Electrostatic charging of the GIOTTO spacecraft due to neutral gas impact

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982giot.rept...21m&link_type=abstract

In ESA GIOTTO Spacecraft Gas and Plasma Environ. p 21-24 (SEE N82-25962 16-75)

Physics

Electrostatic Charge, European Space Programs, Gold Coatings, Halley'S Comet, Neutral Gases, Spacecraft Charging, Gold Coatings, Ion Production Rates, Ionization Potentials, Secondary Emission, Spacecraft Shielding, Sputtering, Thermal Energy

Scientific paper

The case for a gold coating on the Giotto spacecraft front shield is argued. Previous studies show that the fraction of emitted ions of sputtered surface material is least for gold, and that relative secondary electron yield is nearly constant for all surface materials. Gold coatings have a relative ion yield between - 1 million and - 0.000,001, with a monotonic potential structure. The positive floating potential is determined by balancing the electron currents and is strongly shielded by the emitted electrons alone. The value of the floating potential, calculated by balancing the current densities of emitted particles, depends mainly on the ambient plasma properties.

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