Critical Temperature for the Onset of Spacecraft Charging at Geosynchronous Altitudes in a `Cut-Off' Maxwellian Space Plasma

Details Critical Temperature for the Onset of Spacecraft Charging at Geosynchronous Altitudes in a `Cut-Off' Maxwellian Space Plasma Critical Temperature for the Onset of Spacecraft Charging at Geosynchronous Altitudes in a `Cut-Off' Maxwellian Space Plasma

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa43b..05l&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA43B-05

Physics

Plasma Physics

7800 Space Plasma Physics, 7853 Spacecraft/Atmosphere Interactions, 7855 Spacecraft Sheaths, Wakes, Charging

Scientific paper

Spacecraft charging at geosynchronous altitudes occurs more likely on the dawn side than on the dusk side of midnight. The conventional wisdom says that hot electrons drift to the morning side because of convection and the Earth's magnetic field curvature and gradient. We point out that there is a supplementary reason: the cutoff energy of the electron distribution is lower on the dusk side than on the dawn side of midnight. We have derived a critical temperature formula for a `cutoff' Maxwellian distribution and obtained the critical temperature values for various surface materials at normal and isotropic incidence of ambient electrons with the cutoff energy as a variable parameter. Lowering the cutoff energy raises the critical temperature.

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