Diodelike response of high-latitude plasma in magnetosphere-ionosphere coupling in the presence of field-aligned currents

Details Diodelike response of high-latitude plasma in magnetosphere-ionosphere coupling in the presence of field-aligned currents Diodelike response of high-latitude plasma in magnetosphere-ionosphere coupling in the presence of field-aligned currents

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9712045m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A8, Aug. 1, 1992, p. 12,045-12,056. Research supported by U.S. Na

Physics

14

Field Aligned Currents, Magnetosphere-Ionosphere Coupling, Plasma Dynamics, Space Plasmas, Electron Energy, Ion Temperature, Plasma Density, Velocity Distribution, Vertical Distribution

Scientific paper

The dynamic processes in the plasma along high-latitude field lines plays an important role in ionosphere-magnetosphere coupling process. A time-dependent, large-scale simulation of these dynamics parallel to the geomagnetic field lines from the ionosphere well into the magnetosphere is created. The plasma consists of hot e(-) and H(+) of magnetospheric origin and low-energy e(-), H(+), and O(+) of ionospheric origin. Including multiple electron species, a major improvement to the model, made it possible for the first time to simulate the upward current region properly and to dynamically simulate the diodelike response of the field-line plasma to the parallel currents coupling the ionosphere and magnetosphere. It is shown that return currents flow with small resistance, while upward currents produce kilovolt-sized potential drops along the field, as concluded from satellite observations. The kilovolt potential drops are due to the effect of the converging magnetic field on the high-energy magnetospheric electrons.

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