Physics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984giot.rept...65p&link_type=abstract
In ESA The Giotto Spacecraft Impact-Induced Plasma Environ. p 65-69 (SEE N85-23905 14-18)
Physics
Giotto Mission, Halley'S Comet, Near Wakes, Plasma Sheaths, Spacecraft Charging, Electrostatic Charge, Equipotentials, Potential Fields, Solar Arrays, Surface Ionization
Scientific paper
Giotto spacecraft charging and electrostatic fields caused by impact-generated plasma emitted from the Giotto bumper shield at 600 to 1000 km from Halley's comet are estimated. Results indicate that Giotto will not charge significantly above +25 V. The wake surface charges to a high negative potential of -450 V. The wake-surface charge does not influence the emitted ions and is not discharged by them. Near the side surface there is a disturbed population of ambient ions (no impact-generated ions reach the side surface). Near the forward half of the side surface, the electron population is dominated by the impact-generated electrons. Near the rearward half there are no electrons because of the highly-negative wake surface. A tilt of the solar array surfaces toward the wake direction could result in their charging to high negative potentials.
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