Considerations on surface potentials, wake effects and related experimental investigations associated with a cometary flyby

Details Considerations on surface potentials, wake effects and related experimental investigations associated with a cometary flyby Considerations on surface potentials, wake effects and related experimental investigations associated with a cometary flyby

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982giot.rept...47g&link_type=abstract

In ESA GIOTTO Spacecraft Gas and Plasma Environ. p 47-57 (SEE N82-25962 16-75)

Physics

Electric Potential, European Space Programs, Flyby Missions, Halley'S Comet, Spacecraft Charging, Wakes, Electrostatic Charge, Gas-Metal Interactions, Ion Production Rates, Neutral Gases, Pioneer Venus 1 Spacecraft, Plasma-Electromagnetic Interaction, Satellite Design, Solar Wind

Scientific paper

Electric charge distribution on the Giotto spacecraft surface and its near environment are considered in order to assess differential charging possibilities and the magnitude of associated electric potentials. Impact ionization effects on Pioneer Venus orbiter measurements are reviewed, and laboratory investigation of a probe submitted to neutral gas impact is summarized. Evidence suggests that the spacecraft surface can be divided into sections which interact in distinctly different ways with the environment. If the surface is not conductive, differential charging occurs. The surface potentials lie between - 20 and + 20V. The outer surface of the shield floats at a positive potential; surfaces in the wake develop, if insulated, a negative potential. In order to minimize the level of possible interferences, all exposed metallic parts should be electrically connected to the structure and no insulator should be located in the wake.

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