Variation of the spacecraft potential in the magnetosphere

Details Variation of the spacecraft potential in the magnetosphere Variation of the spacecraft potential in the magnetosphere

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.1735l&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 16, p. 1735-1744.

Physics

4

Scientific paper

This paper deals with the surface charging of the Polar satellite, using the spacecraft potential measurements of the electric field instrument (EFI) gathered during 48 months in 1996-1999. For most of the time, the satellite floats at a positive potential Vsc in the magnetosphere because of a high flux of photoelectrons emitted from the satellite surface; typically Vsc varies between 0 and 50V so that it is 0-1V in the plasmasphere, at the plasmapause it exhibits a steep increase by 3-5V, and outside the plasmasphere Vsc is usually more than 5V. On the dayside magnetosphere Vsc is 7-8V in average, whereas on the nightside it lies in the 10-20V range. In the cusp, however, Vsc is only about 3V, similar to spacecraft potentials observed in the magnetosheath. Highest Vsc's occur in the high-altitude (>4RE) polar cap, where Vsc is usually between 20 and 30V, and on auroral field lines where it is frequently in the 30-50V range and occasionally, approximately 1.5% of time, above 50V.

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