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Spacecraft Charging on ATS-5.
Air Force surveys in geophysics,
AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA
Pagination or Media Count:
The distribution of plasma electron and proton temperature at the time of spacecraft charging events during eclipse are obtained from ATS-5 data for 1969 to 1971. The mean RMS electron temperature is 3 keV and the highest value measure is 6.5 keV. The mean RMS ion temperature is 9 keV the highest value is 12 keV. The current-voltage characteristic curve shows that a threshold current for charging exists which is 0.000001 Asq m. The charging current has a narrow distribution around 0.0000015 Asq m. The spacecraft ground potential varies approximately linearly with RMS plasma electron temperature consistent with the behavior of a dielectric probe in a plasma. Author
APPROVED FOR PUBLIC RELEASE