SM21A-2470
Dynamic Modeling of EMIC Wave Activity in a Realistic Magnetosphere
Tuesday, 15 December 2015
Poster Hall (Moscone South)
James Parker McCollough II, Air Force Research Laboratory, Kirtland AFB, NM, United States, Scot Richard Elkington, Laboratory for Atmospheric and Space Physics, Boulder, CO, United States, Maria Usanova, University of Colorado at Boulder, Boulder, CO, United States and Jacob Bortnik, UCLA, Atmospheric and Oceanic Sciences, Los Angeles, CA, United States
Abstract:
On 14-16 December 2006, A geomagnetic storm was observed accompanied by electromagnetic ion-cyclotron (EMIC) wave activity. We use a 3D test particle simulation in a realistic magnetosphere from the global Lyon-Fedder-Mobarry (LFM) MHD code to compute the phase space density dynamics of warm electrons responsible for chorus wave growth. We use these results to compute the temperature anisotropy and density for input into a linear convective wave growth rate for EMIC waves. We then follow Bortnik et al. [2010] to compute EMIC saturation amplitudes to provide a global dynamical picture of EMIC wave activity for this event. We will perform a data-model comparison of the modeled wave amplitudes with the observed wave activity, aiding in understanding the spatio-temporal and spectral response of EMIC wave activity to geomagnetic disturbances.
