Generalized kinetic description of a plasma in an arbitrary field-aligned potential energy structure

Details Generalized kinetic description of a plasma in an arbitrary field-aligned potential energy structure Generalized kinetic description of a plasma in an arbitrary field-aligned potential energy structure

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.6871k&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue A4, p. 6871-6890

Physics

Plasma Physics

11

Ionosphere: Polar Cap Ionosphere, Magnetospheric Physics: Energetic Particles, Precipitating, Space Plasma Physics: Charged Particle Motion And Acceleration, Space Plasma Physics: Kinetic And Mhd Theory

Scientific paper

We present a general solution to the collisionless Boltzmann (Vlasov) equation for a free-flowing plasma along a magnetic field line using Liouville's theorem, allowing for an arbitrary field-aligned potential energy structure including nonmonotonicities. The constraints of the existing collisionless kinetic transport models are explored, and the need for a more general approach to the problem of self-consistent potential energy calculations is described. Then a technique that handles an arbitrary potential energy distribution along the field line is presented and discussed. For precipitation of magnetospherically trapped hot plasma, this model yields moment calculations that vary by up to a factor of 2 for various potential energy structures with the same total potential energy drop. The differences are much greater for the high-latitude outflow scenario, giving order of magnitude variations depending on the shape of the potential energy distribution. Self-consistent calculations for the photoelectron-driven polar wind are compared with previous results, and it is shown that even a photoelectron concentration of 0.03% at the base of the simulation (500 km) will cause the potential energy distribution to violate the constraints of the existing models.

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