Equivalent ionospheric currents from the GIMA, Greenland, MACCS, and THEMIS ground magnetometer arrays

Details Equivalent ionospheric currents from the GIMA, Greenland, MACCS, and THEMIS ground magnetometer arrays Equivalent ionospheric currents from the GIMA, Greenland, MACCS, and THEMIS ground magnetometer arrays

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43a1693a&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM43A-1693

Physics

2721 Field-Aligned Currents And Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions (2431), 2790 Substorms, 2794 Instruments And Techniques

Scientific paper

With data from the GIMA, Greenland, MACCs, 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 will be 1 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. For this study we will first demonstrate the validity of the technique when used with the mentioned magnetometer arrays by applying it to a synthetic model case, and then examine the equivalent ionospheric currents associated with substorm events on March 23, 2007 and February 26 2008.

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