Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm21a0312g&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM21A-0312
Other
2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2753 Numerical Modeling, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
Electromagnetic ion cyclotron (EMIC) waves are an important magnetospheric emission, which is excited near the magnetic equator with frequencies below the proton gyro-frequency. The source of free energy for wave growth is provided by temperature anisotropy of ring current (RC) ions, which naturally develops during inward convection from the plasmasheet. These waves strongly affect the dynamics of resonant RC ions, thermal electrons and ions, and the outer radiation belt relativistic electrons, leading to non-adiabatic particle heating and/or pitch-angle scattering and loss to the atmosphere. The rate of ion and electron scattering/heating is strongly controlled by the wave power spectral density and the wave spatial/temporal distributions. Unfortunately, the currently available observational information regarding EMIC wave power spectral density is poor. So combinations of reliable data and theoretical models should be utilized in order to obtain the power spectral density of EMIC waves over the entire magnetosphere throughout the different storm phases. In this study, we present the simulation results, which are based on two coupled RC models that our group has developed. The first model deals with the large-scale magnetosphere-ionosphere electrodynamic coupling, and provides a self- consistent description of RC ions/electrons and the magnetospheric electric field. The second model is based on a coupled system of two kinetic equations and self-consistently treats a micro-scale electrodynamic coupling of RC and EMIC waves; one equation describes the RC ion dynamics and another equation describes the power spectral density evolution of EMIC waves. So far, these two models have been applied independently. However, the large-scale magnetosphere-ionosphere electrodynamics controls the convective patterns of both the RC ions and plasmasphere altering conditions for EMIC wave-particle interaction. In turn, the wave induced RC precipitations change the local field-aligned current distribution and the ionospheric conductances, which are crucial for a large-scale electrodynamics. The initial results from this new self-consistent model of the magnetospheric electric field, RC and EMIC waves will be shown in this presentation.
Fok M.-
Gamayunov Konstantin
Khazanov George
Liemohn Michael
Ridley A. A.
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