Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 29, Issue 14, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2001GL014207
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[1] A model of field-aligned currents is derived from high-precision magnetic field measurements from the Orsted and Magsat satellites, being parameterized by the interplanetary magnetic field strength and direction for summer, winter and equinox. The high-precision data allow the model to be determined directly by a simple 2-D curl technique combined with fitting of spherical harmonic functions. New elements of the model are: (a) the FAC patterns are determined separately for both polar regions, resolving the seasonal dependence of interhemispheric asymmetries, (b) the IMF similar to 0, ground-state patterns are also resolved; these elements are obtained for the first time. From the model, the total upward/downward currents have been determined for various IMF conditions. The ratio of the summer/winter currents is similar to1.35 and the equinox currents similar to1. The model allows FAC mapping for IMF |B| less than or equal to 12 nT, except during magnetic storms and substorms.
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