Computer Science
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981esasp.155...97g&link_type=abstract
In ESA The Comet Halley Probe. Plasma Environ. p 97-99 (SEE N81-34113 24-88)
Computer Science
Halley'S Comet, Plasma Sheaths, Space Probes, Spacecraft Charging, Comet Heads, Cosmic Dust, European Space Agency, Flyby Missions, Hypervelocity Impact, Potential Gradients, Spacecraft Shielding
Scientific paper
The effects of sputtering and secondary emission can be reduced if the emitting surface has a honeycomb structure, is grooved or rough. The outer surface must be coated with a 10 micron layer of gold to reduce the number of emitted ions. Interactions between incident molecules and the spacecraft surface are not expected to increase the overall sputtering rate. Neutral gas density enhancement in front of the spacecraft is negligible because of few collisions between emitted material and the cometary wind. Computer simulations show that during the final phase of the encounter, the leading edge of Giotto will float at a potential of +10 V. Serious disturbances in the telemetry link can be expected for a few sec if closest approach is less than 100 km. If the spacecraft surface is not conductive, differential charging will occur and the surface potentials will lie within the range, -20 to +20 V. The outer surface of the shield will float at a positive potential; surfaces in the wake will develop, if insulated, a negative potential of at least -20 V.
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