Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume 110, Issue A10, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2004JA010870
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[1] 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 mu Am-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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