Plasma dynamics driven by finite-width current filament and KV potential drops in ionosphere-magnetosphere coupling

Details Plasma dynamics driven by finite-width current filament and KV potential drops in ionosphere-magnetosphere coupling Plasma dynamics driven by finite-width current filament and KV potential drops in ionosphere-magnetosphere coupling

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..975g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 10, p. 975-978.

Other

10

Field Aligned Currents, Magnetosphere-Ionosphere Coupling, Particle In Cell Technique, Plasma Dynamics, Two Dimensional Models, Electric Potential, Plasma Currents, Space Plasmas

Scientific paper

We have simulated the plasma dynamics of a quasi-two-dimensional current filament in ionosphere-magnetosphere coupling. The simulation consists of a set of one-dimensional flux tube simulations with different imposed time-dependent, field-aligned currents. The dynamical interactions of the individual current filaments with the ionospheric and magnetospheric plasma generate kV field-aligned potential drops along the field lines, and the side-by-side display exhibits the evolution of the implied potential structure in the horizontal direction. The primary cross-field motion produced by the horizontal E-field (ExB drift) is perpendicular to both of the significant spatial directions, and is thus ignorable in this geometry. The effects of other cross-field drict processes are discussed. The simulation thus provides insight into the dynamical evolution of 2D potential structures driven by an imposed finite-width field-aligned current profile. Spatial and temporal variation of other plasma parameters (temperatures, density, etc.) that are determined primarily by parallel transport effects are also displayed.

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