HR: 1340h
AN: SM43A-1144    [Abstracts]
TI: Energy Deposition in Magnetic Cloud and High Speed Stream Driven Storms
AU: * Mitchell, E J
EM: ejoymitchell@yahoo.com
AF: University of Texas at El Paso, Department of Physics 500 W. University, El Paso, TX 79968 United States
AU: Turner, N E
EM: neturner@fit.edu
AF: Florida Institute of Technology, Department of Physics and Space Science 150 W. University Blvd, Melbourne, FL 32901 United States
AB: The solar wind couples a large amount of energy into the magnetosphere-ionosphere system; this energy is released in the form of geomagnetic storms. While the precise mechanism for this coupling and release is yet unclear, it is well established that different solar wind conditions create different responses within the magnetosphere-ionosphere system. We are examining the impact of high speed stream-driven and magnetic cloud-driven storms on the global redistribution of energy throughout the magnetosphere-ionosphere system. Data are used from ACE, WIND, and ground magnetometers. We estimate the energy input and output for multiple geomagnetic storms spanning from1995 to 1998. The comparison of storms reveals high speed stream-driven storms deposit less energy per second, but over longer durations. The comparison further reveals magnetic cloud-driven storms have deeper Dst* depressions but with shorter durations. Our results suggest magnetic cloud-driven storms with similar input parameters as high speed stream-driven storms produce an overall lower energy deposition.
DE: 2700 MAGNETOSPHERIC PHYSICS
DE: 2784 Solar wind/magnetosphere interactions
DE: 2788 Storms and substorms
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting