HR: 15:10h
AN: SM13E-07    [Abstracts]
TI: Geomagnetic Storms and Electromagnetic Ion Cyclotron Waves
AU: * Fraser, B J
EM: brian.fraser@newcastle.edu.au
AF: Centre for Space Physics, School of Mathematical and Physical Sciences, University of Newcastle, University Drive, Callaghan, NSW 2308, Australia
AU: Green, J C
EM: jgreen@sec.noaa.gov
AF: Space Environment Centre, NOAA/SEC, 325 Broadway, Boulder, CO 80305, United States
AU: Singer, H J
EM: hsinger@sec.noaa.gov
AF: Space Environment Centre, NOAA/SEC, 325 Broadway, Boulder, CO 80305, United States
AB: Electromagnetic ion cyclotron (EMIC) waves are considered to play an important role in magnetosphere dynamics, including contributions to ring current ion losses and radiation belt electron losses. Theoretical studies suggest that some of these processes may be most effective during the main phase of geomagnetic storms. However, ground-based signatures of EMIC waves, Pc1-2 geomagnetic pulsations, are only occasionally observed during the main phase, and more frequently occur during the recovery phase. In this study using space-based data, we will investigate the association of EMIC waves with the various storm phases in case studies of up to 10 geomagnetic storms over 1996 – 2002. High resolution data from the GOES 8-12 geostationary satellite magnetometers provide information on EMIC wave activity in the 0 – 1 Hz band. Storm data includes Dst, Kp and upstream solar wind and IMF parameters. Other properties of the EMIC waves of interest to modellers including wave frequency, wave power and spectral energy density will be investigated with respect to the storm phase.
DE: 2731 Magnetosphere: outer
DE: 2772 Plasma waves and instabilities (2471)
DE: 2774 Radiation belts
DE: 2778 Ring current
DE: 2788 Magnetic storms and substorms (7954)
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting