The importance of accurate secondary electron yields in modeling spacecraft charging

Details The importance of accurate secondary electron yields in modeling spacecraft charging The importance of accurate secondary electron yields in modeling spacecraft charging

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9113739k&link_type=abstract

Journal of Geophysical Research, Volume 91, Issue A12, p. 13739-13744

Physics

13

Scientific paper

Spacecraft charging has commonly been attributed to electrons with several kilovolts of energy impinging upon spacecraft surfaces. Recent experimental evidence from the SCATHA satellite has shown that charging correlates well with electrons of energies greater than 30 keV. In this paper it is shown that the SCATHA observations are consistent with the model of charging in which a satellite is immersed in a Maxwellian plasma, particle collection is orbit limited, and dominant surface effects are the emission of secondary and backscattered electrons. The energy dependence of the secondary yield for multikilovolt incicent electrons determines the charging threshold. In the past, inadequate representations of the secondary electron yield formulation based on electron stopping power, such as the one in NASA Charging Analyzer Program (NASCAP), gives good agreement with the SCATHA results. A Maxwellian representation of the magnetospheric plasma is justified by choosing effective temperatures and densities that minimize the error in calculating charging current densities.

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