Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13c2090l&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM13C-2090
Physics
[2400] Ionosphere, [2407] Ionosphere / Auroral Ionosphere, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2712] Magnetospheric Physics / Electric Fields
Scientific paper
Hundreds of measurements of magnetospheric electric fields magnetically conjugate to operating ground radars have been made by the Electric Field Instrument (EFI) onboard the THEMIS satellites at 7-10 RE geocentric distance. In this study, these measurements are compared to the ionospheric electric fields at the northern conjugate point at Poker Flat (65°N, 147°W). For the comparison, the magnetic field measurements are subtracted for the E = - V×B component produced by the spacecraft motion. The corrected data have a magnitude of a few mV/m, providing a significant measurement of the electric field in the magnetosphere. The data are then compared to the simultaneous observations by the ground-based incoherent scatter radar at Poker Flat. The Tsyganenko magnetic field model is used to map the magnetic footprints from the THEMIS spacecraft positions to the ground. The data are selected for comparison to radar measurements when the satellite footpoints fall into the range of the radar measurements. Comparisons are made for both the electric field directions and magnitudes, and differences are found between the THEMIS observations in the magnetosphere and the radar data for the ionosphere. We show how these differences are related to magnetic activity levels and substorm phase.
Angelopoulos Vassilis
Bonnell J. W.
England Scott
Frey Harald U.
Heinselman Craig J.
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