IMF-Dependent Maps of High-Latitude Field-Aligned Currents Derived From Ørsted and CHAMP High-Precision Magnetic Field Measurements

Details IMF-Dependent Maps of High-Latitude Field-Aligned Currents Derived From Ørsted and CHAMP High-Precision Magnetic Field Measurements IMF-Dependent Maps of High-Latitude Field-Aligned Currents Derived From Ørsted and CHAMP High-Precision Magnetic Field Measurements

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm42a0590c&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM42A-0590

Physics

2409 Current Systems (2708), 2411 Electric Fields (2712), 2463 Plasma Convection, 2708 Current Systems (2409), 2712 Electric Fields (2411)

Scientific paper

Since their launch time, the Ørsted (1999-02-23) and CHAMP (2000-07-15) satellites have provided a bulk of high-precision geomagnetic field measurements made over both the northern and southern polar caps and covering all magnetic local times. As these observations now go for more than four years, these data are available for all variations in the Earth's dipole tilt (i.e., smoothly transitioning between the summer, equinox, and winter seasons) and for a variety of interplanetary magnetic field (IMF) conditions. In this study, we show a revised field-aligned currents empirical model (FACEM) for high-latitudes that was derived from the satellites data for quiet and moderate (but non-storm) IMF conditions. The model is mainly parameterized by the IMF strength and direction, as well as the Earth's dipole tilt angle. The model's detailed maps of the high-latitude field-aligned currents allow a researcher to follow evolution of the major field-aligned current systems (e.g., R0/R1/R2 and cusp currents) as the IMF vector rotates in the GSM Y-Z plane and the dipole tilt changes. Since the 23rd solar cycle shows a double maximum in 2000-2002, we attempt to deduce the solar activity effects on statistical distributions of the high-latitude field-aligned currents from 1999 and up to present time.

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