Current-voltage relationship in downward field-aligned current region

Details Current-voltage relationship in downward field-aligned current region Current-voltage relationship in downward field-aligned current region

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11010s10c&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A10, CiteID A10S10

Physics

7

Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409), Magnetospheric Physics: Electric Fields (2411), Ionosphere: Particle Acceleration

Scientific paper

Field-aligned electrons accelerated upward from the ionosphere to the magnetosphere are the principal charge carriers in the auroral downward field-aligned current region. Current densities, typically of the order of a few μAm-2, are sustained by potential drops of several 100 V up to a few kV. This paper uses a model presented in a separate paper in this special section (Cran-McGreehin and Wright, 2005) to obtain an analytical nonlinear current-voltage relationship for the downward current, which is complimentary to the well-known linear current-voltage relation for the upward current region (Knight, 1973). Exact and approximate current-voltage relations are given. These relations are compared with FAST observations and show good agreement.

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