Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm13a0320h&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM13A-0320
Physics
2409 Current Systems (2721), 2435 Ionospheric Disturbances, 2447 Modeling And Forecasting, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
Transients in the solar wind impinging on the dayside magnetopause that cause motion of the magnetopause lead to electrical currents that flow between the magnetosphere and ionosphere (M-I) coupling these regions. An important step in understanding the interaction of the solar wind with the M-I system is to measure and model the current systems that result from various interactions. One type of solar wind transient known as a sudden impulse (SI) is characterized by a step-change in the solar wind dynamic pressure during predominantly northward IMF and is associated with a distinct signature in ground magnetometer and radar data. A model of the ionospheric currents caused by SI events is developed by optimizing fits with ground observations. Comparisons to observations is shown for several events. By using an Earth conductivity model, the induced electric field at the surface of the Earth, which is responsible for geomagnetically induced currents (GICs) is also be determined for typical SI events.
Holliday M. J.
Murr David Lee
Shea J. C.
Shepherd Simon G.
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