A Preliminary Comparison Between SuperDARN Flow Vectors and Equivalent Ionospheric Currents From the GIMA, Greenland, MACCS, THEMIS, CARISMA, and CANMOS Ground Magnetometer Arrays

Details A Preliminary Comparison Between SuperDARN Flow Vectors and Equivalent Ionospheric Currents From the GIMA, Greenland, MACCS, THEMIS, CARISMA, and CANMOS Ground Magnetometer Arrays A Preliminary Comparison Between SuperDARN Flow Vectors and Equivalent Ionospheric Currents From the GIMA, Greenland, MACCS, THEMIS, CARISMA, and CANMOS Ground Magnetometer Arrays

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm41a1703k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM41A-1703

Physics

[2407] Ionosphere / Auroral Ionosphere, [2463] Ionosphere / Plasma Convection, [2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [2760] Magnetospheric Physics / Plasma Convection

Scientific paper

With data from the GIMA, Greenland, MACCs, CARISMA, and CANMOS, and THEMIS ground magnetometer arrays, we obtain maps of equivalent ionospheric currents (EIC) over North America using the state-of-art technique based on SECS (spherical elementary currents systems) developed by Amm and Viljanen [1999] . The EIC maps can be calculated with the same time resolution as the magnetometer data, which is 10 sec. The results thus show in detail the dynamic evolution of the currents over the whole THEMIS ground network. The EIC maps can further be compared and quantitatively combined with near simultaneous images of the THEMIS all sky imager mosaics, SuperDARN RADAR data, and THEMIS spacecraft data. We find using 5 full days of SuperDARN flow vector data obtained during the northern hemisphere winter that the flows, in general, are antiparallel to the EICs. The largest differences from the antiparallel direction appear to occur during moderate to quiet geomagnetic conditions in the midnight sector. These differences are most likely the result of non-uniform conductivity in the ionosphere that influences the EIC direction.

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