Physics
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.7759o&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, June 1, 1990, p. 7759-7771. Research supported by the U.S. Navy and N
Physics
5
Ion Beams, Magnetospheric Ion Density, Plasma Guns, Plasma Waves, Satellite Observation, Frequency Ranges, Plasma Frequencies, Scatha Satellite, Spacecraft Charging, Temporal Resolution
Scientific paper
Experiments in charge control on the AF/NASA P78-2 (SCATHA) satellite were conducted with a plasma/ion source in the inner magnetosphere. These experiments were monitored with plasma wave instruments capable of high temporal and frequency resolution in the 0-6 kHz frequency range. Ion gun experiments revealed two distinct classes of behavior. Nonneutralized ion beam operation at 1 mA, 1kV resulted in arcing signatures (spiky in time, broad frequency range), coincident with induced satellite potentials of -600 to -900 V. This signature disappeared when the accelerating voltage was switched off or the beam was neutralized. The signal is attributed to arcing between differentially charged surfaces. An additional feature was noted in the 100-kHz channel of the wave receiver. During emission of dense, low-energy plasma, a signal is generated which may be at the upper hybrid, or plasma frequency for the local plasma.
Olsen Richard Christopher
Roeder James L.
Weddle L. E.
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