The range and limits on the space charging electron currents available in the near-geosynchronous orbit have been identified from a large SCATHA satellite data base. The most intense current densities observed were 0.8 nA/cm2 at 1 keV and 0.5 pA/cm2 at 1 MeV. The effects of these currents on both surface and internal charging of dielectrics have been modeled. In exposed dielectrics radiation-induced effects significantly increase the conductivity within the first few mum of the surface, produce permanent radiation damage, and affect the final potential of the sample. The calculated electric field profiles and surface potential of a 127 mum Kapton sample are found to be consistent with the voltage measured aboard the SCATHA satellite during a charging event. The electric fields and voltage internal to both plane-parallel and coaxial geometries containing a Teflon dielectric enclosed between two conductors have also been modeled.
Space charging currents and their effects on spacecraft systems
Raumladungsstroeme und ihre Wirkung auf Raumschiffe
IEEE Transactions on Electrical Insulation ; EL-18 , 3 ; 354-365
1983
12 Seiten, 20 Quellen
Aufsatz (Zeitschrift)
Englisch
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