A new model of field-aligned currents derived from high-precision satellite magnetic field data

Details A new model of field-aligned currents derived from high-precision satellite magnetic field data A new model of field-aligned currents derived from high-precision satellite magnetic field data

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29n..28p&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 14, pp. 28-1, CiteID 1683, DOI 10.1029/2001GL014207

Physics

32

Ionosphere: Plasma Waves And Instabilities, Magnetospheric Physics: Electric Fields (2411), Magnetospheric Physics: Current Systems (2409), Ionosphere: Current Systems (2708)

Scientific paper

A model of field-aligned currents is derived from high-precision magnetic field measurements from the Ørsted 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 ~ 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 ~1.35 and the equinox currents ~1. The model allows FAC mapping for IMF |B| <= 12 nT, except during magnetic storms and substorms.

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