Physics – Plasma Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm42c..10s&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM42C-10
Physics
Plasma Physics
2700 Magnetospheric Physics, 2764 Plasma Sheet, 7800 Space Plasma Physics, 7807 Charged Particle Motion And Acceleration, 7827 Kinetic And Mhd Theory
Scientific paper
Using steady-state Vlasov-theory, we obtain an explicit description of the properties of thin current sheets in two space dimensions. The treatment is self-consistent and based on exact particle orbits including chaotic motion, the plasma is treated as quasi-neutral. The method is not restricted to local Maxwellean distributions functions, which opens the possibility to model thin current sheets embedded in wider sheets. In the limit of vanishing particle gyro-scales the present description overlaps with magnetohydrostatics. Two cases of kinetic current sheet equilibria are presented. One of them adds particle orbit effects to an MHD-equilibrium that we obtained as a member of an adiabatic sequence, which reaches a singularity for a finite boundary perturbation (presented separately). The results illustrate how finite ion gyro-scales affect the current sheet structure for increasing ion gyro-scale. Further aspects that are analyzed include the contributions of electrons and ions to the total current density, Hall-currents, the occurrence of significant electric fields, the role of the ion/electron temperature ratio and the consequences of a Galilean transformation.
Birn Joachim
Schindler Karl
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