Large-Scale Ionospheric Conductance from Combined Satellite and Ground-Based Electromagnetic Data

Details Large-Scale Ionospheric Conductance from Combined Satellite and Ground-Based Electromagnetic Data Large-Scale Ionospheric Conductance from Combined Satellite and Ground-Based Electromagnetic Data

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm11d..06g&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM11D-06

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2407 Auroral Ionosphere (2704), 2409 Current Systems (2721), 2411 Electric Fields (2712), 2494 Instruments And Techniques, 2721 Field-Aligned Currents And Current Systems (2409)

Scientific paper

The spatial and temporal distribution of ionospheric conductance is a critical parameter for magnetosphere- ionosphere coupling. At present, global ionospheric conductance estimates with high time resolution (< 1 hour) are only available by combining optical satellite data with models of precipitating particle interaction with the neutral atmosphere. The alternative approach presented here extends previous methods that estimate ionospheric conductance using electromagnetic data. Since it is not possible to have complete knowledge of the horizontal ionospheric current (ěc{J}\perp) based solely on observations from the Earth's surface, previous applications of Ohm's law to the height-integrated ionosphere have required an assumed Hall to Pedersen conductance ratio (α=Σ_H/Σ_P). Recently available magnetic field observations from the Iridium satellite constellation are here combined with ground-based magnetometer data to estimate the complete horizontal ionospheric current, ěc{J}\perp. This result, combined with electric field information obtained from the Super Dual Auroral Radar Network, allows the Hall and Pedersen conductances to be independently calculated without assuming a value for α. Initial conductance results are presented for an event with 1 hour integration time and favorable data coverage.

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