Physics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984giot.rept...59m&link_type=abstract
In ESA The Giotto Spacecraft Impact-Induced Plasma Environ. p 59-63 (SEE N85-23905 14-18)
Physics
Electron Emission, Giotto Mission, Interplanetary Dust, Plasma Clouds, Spacecraft Models, Surface Ionization, Cometary Atmospheres, Electron Energy, Plasma Potentials, Spacecraft Charging
Scientific paper
A model to estimate the electric potential of an expanding plasma cloud and the influence of released electrons on the floating potential of Giotto was developed. Approximations reveal uncertainties in the magnitude of expected pulses in floating potential. According to the model, pulse magnitude strongly depends on the thermal energy of plasma cloud electrons and on the shielding length of ambient plasma. However, uncertainties exist in ambient plasma parameters, especially in the effect of the strong secondary emission due to neutral gas impact. Little is known about the electron temperature of the expanding plasma cloud. In the worst case, potential pulses of tens of volts lasting up to a few millisec are expected, especially close behind the bow shock of comet Halley. Closer to the nucleus, potential variations in the probe's environment and floating potential pulses decrease in magnitude, but increase in frequency.
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