Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72b0619c&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM72B-0619
Physics
2708 Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms
Scientific paper
In this study, we continue our investigation of the magnetic storm time conditions, specifically focusing on the distributions of high-latitude field-aligned currents during intermediate and strong storms derived from high-precision geomagnetic field observations made onboard the Ørsted and CHAMP satellites in 1999-2002. We find that Region 1 field-aligned currents saturate during strong (Dst < -100 nT) storms because of very strong solar wind-magnetosphere-ionosphere (SWMI) coupling, proving experimentally Hill's theoretical SWMI model. This model takes into account a feedback from the ionosphere to the magnetosphere through varying ionospheric conductivity and Region 1 currents, leading to saturation of the cross-polar electric potential. We discuss the obtained statistical distributions of these currents, as well as the voltage-current relation responsible for the generation of these field-aligned and ionospheric current systems.
Christiansen Freddy
Papitashvili Vladimir O.
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