Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm54a..03s&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM54A-03
Other
2411 Electric Fields (2712), 2431 Ionosphere/Magnetosphere Interactions (2736), 2712 Electric Fields (2411), 2753 Numerical Modeling, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
Prompt penetration of magnetospheric convection electric fields to the mid- and low-latitude ionosphere is caused by transient changes in the shielding capacity of region-2 Birkeland currents, reconfiguration of inner magnetospheric magnetic field, and other dynamic processes ultimately originating in the solar wind. During magnetically disturbed times, these electric fields cause substantial redistribution of ionospheric electron densities, and, in the equatorial region, are a major parameter controlling linear growth rates and non-linear evolution of spread-F plasma instabilities. In this paper, we use the global numerical model BATSRUS-RCM, a global MHD code with an inner magnetospheric module, to study time propagation of prompt penetration electric fields in response to idealized changes in the solar wind conditions. For the first time, we are able to compute, from first principles, solutions that link changes in the solar wind parameters (e.g., IMF strength and orientation) to the local-time dependent electric fields at the equator of the Earth. These theoretical solutions will be compared with a number of case studies, relating cases of prompt-penetration electric fields observed with the Jicamarca Observatory incoherent scatter radar to changes in the solar wind conditions.
Caldwell J. Jr. J.
de Zeeuw Darren L.
Fejer Bela G.
Gombosi Tamas I.
Sazykin Stanislav
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