Spacecraft Potential Control for Cluster - a Summary of Year One

Details Spacecraft Potential Control for Cluster - a Summary of Year One Spacecraft Potential Control for Cluster - a Summary of Year One

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm22a0834t&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM22A-0834

Physics

7855 Spacecraft Sheaths, Wakes, Charging, 7894 Instruments And Techniques

Scientific paper

The feasibility of spacecraft potential control by an ion beam in the energy range from 6 to 8 keV has been demonstrated successfully onboard earlier satellites. The instrument ASPOC onboard Cluster, however, achieved a new record in operating time. The lowered and stabilized spacecraft potential proved to be extremely useful for low energy plasma measurements, since the flux of photo-electrons generated at the spacecraft surface and entering the sensors is reduced significantly. No emissions induced by ion beam interaction have been identified, but some interesting effects were observed in DC electric field data, probably related to re-distributed photo-electrons in the modified spacecraft sheath. The paper gives a summary of operations, main achievements with plasma measurements and modelling efforts of the potential.

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