Nonlinear kinetic modeling of early stage plasmaspheric refilling

Details Nonlinear kinetic modeling of early stage plasmaspheric refilling Nonlinear kinetic modeling of early stage plasmaspheric refilling

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10410295l&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A5, p. 10295-10306

Physics

Plasma Physics

9

Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Space Plasma Physics: Charged Particle Motion And Acceleration, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

A new time-dependent kinetic model is used to investigate the effects of self-consistency and hot plasma influences on plasmaspheric refilling. The model employs a direct solution of the kinetic equation with a Fokker-Planck Coulomb collision operator to obtain the phase space distribution function of the thermal protons along a field line. Of particular interest is the influence of several processes on the source cone distribution function formation. It is found that a self-consistent ion temperature in the collision term can increase or decrease the equatorial plane density, depending not only on the choice of ion temperature in the static-background calculations but also on the form of the nonlinear representation. The inclusion of a self-consistent polarization electric field increases the early stage equatorial plane density by a factor of 2. Investigations of the effects of anisotropic hot plasma populations on the refilling rates shows that, after a slight initial decrease in equatorial density from clearing out the initial distribution, there is a 10 to 30% increase after 4 hours due to these populations. This increase is due primarily to a slowing of the refilling streams near the equator from the reversed electric field.

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