Triple-Root Jump in the Potential of a Spacecraft in a Triple-Maxwellian Space Plasma

Details Triple-Root Jump in the Potential of a Spacecraft in a Triple-Maxwellian Space Plasma Triple-Root Jump in the Potential of a Spacecraft in a Triple-Maxwellian Space Plasma

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm21c0271l&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM21C-0271

Physics

Plasma Physics

7800 Space Plasma Physics, 7815 Electrostatic Structures, 7853 Spacecraft/Atmosphere Interactions, 7855 Spacecraft Sheaths, Wakes, Charging, 7899 General Or Miscellaneous

Scientific paper

This work extends the theory of triple-root jump in the potential of a spacecraft in a double-Maxwellian space plasma to the situation of triple-Maxwellian. We consider three Maxwellian distributions with different temperatures, T1, T2, and T3. In particular, we are concerned about the situation that the high temperature T3 is above T* which is the critical temperature for the onset of negative voltage surface charging, T2 is below T* but above the anti-critical temperature TA below which low-level negative voltage surface charging occurs, and T1 is below TA. Our results show that triple-root situation exists for a spacecraft in such a triple-Maxwellian space plasma. As the modeled space plasma environment changes, it is possible to have triple-root jumps in spacecraft potential. We have obtained an inequality as the necessary condition for the triple-root situation in a triple-Maxwellian space plasma to occur. Other combinations of inequalities are also discussed. This work may be important for modeling spacecraft charging in a triple-Maxwellian space plasma, comprising of a double Maxwellian distribution that is varying with the space weather plus a low energy Maxwellian photoelectron cloud in the spacecraft vicinity.

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