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Polar Earth orbit (PEO) is a peculiar orbit where energetic auroral electrons and lowtemperature ionospheric plasma coexist. There is a risk of charging and subsequent arcing in PEO, which was demonstrated unfortunately by the total loss of ADEOS-II satellite in 2003. Charging in PEO must be properly assessed in the early satellite design phase by a spacecraft charging analysis tool. The plasma environment, namely its density and energy, is crucial parameter for the spacecraft charging analysis. The balance between the auroral electrons and the low temperature ionospheric ions determine the charging potential of a PEO satellite. We statistically analyzed the environmental condition in PEO by using the data of auroral electrons and thermal ions measured by DMSP (Defense Meteorological Satellite Program) satellites. Statistical probability of a given combination of current densities of auroral electrons and thermal ions has been derived. The energy spectrum of the auroral electrons are also classified into several types and correlation with the thermal ions is analyzed.

Statistical Data Analysis of the Aurora Electrons and Thermal Ions for Spacecraft Charging Analysis