HR: 1340h
AN: SM13A-0320    [Abstracts]
TI: Modeling the Ionospheric Response to Sudden Impulse Events
AU: Holliday, M J
EM: michael.holliday@dartmouth.edu
AF: Thayer School of Engineering, 8000 Cummings Hall Dartmouth College, Hanover, NH 03755 United States
AU: * Shepherd, S G
EM: simon@thayer.dartmouth.edu
AF: Thayer School of Engineering, 8000 Cummings Hall Dartmouth College, Hanover, NH 03755 United States
AU: Murr, D L
EM: david.murr@dartmouth.edu
AF: Thayer School of Engineering, 8000 Cummings Hall Dartmouth College, Hanover, NH 03755 United States
AU: Shea, J C
EM: jonathan.shea@dartmouth.edu
AF: Thayer School of Engineering, 8000 Cummings Hall Dartmouth College, Hanover, NH 03755 United States
AB: 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.
DE: 2409 Current systems (2721)
DE: 2435 Ionospheric disturbances
DE: 2447 Modeling and forecasting
DE: 2784 Solar wind/magnetosphere interactions
SC: SPA-Aeronomy [SA]
MN: Fall Meeting 2005