Anti-critical Temperature for Spacecraft Charging

Details Anti-critical Temperature for Spacecraft Charging Anti-critical Temperature for Spacecraft Charging

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm41a1170l&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM41A-1170

Physics

Plasma Physics

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

Scientific paper

In recent years, there has been much interest in the existence of a critical temperature for the onset of spacecraft charging to high voltages. High-voltage charging affects scientific instruments on board and is relevant to spacecraft anomalies. In contrast, not much attention has been paid to low-voltage charging which can also affect scientific experiments on board and is relevant to surface chemistry. For completeness, we contend that there exists an anti-critical temperature for spacecraft surface charging. Ambient electrons at very low temperatures tend to cause surface charging, albeit at low voltages. As the electron temperature increases, spacecraft surface charging ceases at a critical value of temperature depending on the surface material. We present the theory. Numerical results of anti-critical temperatures for typical surface materials in Maxwellian space plasmas are presented.

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