RF Charging of Topside Sounder Spacecraft

Details RF Charging of Topside Sounder Spacecraft RF Charging of Topside Sounder Spacecraft

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998sct..conf..179j&link_type=abstract

Proceedings of the 6th Spacecraft Charging Conference. November 2-6, 1998. AFRL Science Center, Hanscom AFB, MA, USA., p.179-180

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Scientific paper

Evidence concerning RF-induced charging of topside sounder spacecraft is reviewed. The most direct evidence from the orbital sounders ISIS II and Cosmos 1809 is observations of sounder-accelerated ions at energies up to a several tens of electron-volts. These ions are interpreted as the flux to the spacecraft body to discharge the negative electrical potential induced on the body by the action of sounder near fields on ambient electrons. The situation on ISIS II was modeled for frequencies well below the electron plasma and gyrofrequencies, fp and fc , respectively. During the RF pulse, the body was found to go to a negative potential about equal to the peak amplitude of the voltage waveform applied to the sounder dipole. Other observations from the sounders at frequencies around fp and fc, including "floating" resonant signals on ionograms and impedance measurements, attest to RF sheaths and hence to charging. The OEDIPUS-C spacecraft potential measurement has provided proof of RF charging through the whole range of electron characteristic frequencies.

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