HR: 1330h
AN: SM43B-02    [Abstracts]
TI: Ring Current Dynamic in the Presence of Electromagnetic Ion Cyclotron Waves
AU: * Khazanov, G V
EM: George.V.Khazanov@nasa.gov
AF: NASA/MSFC, 320 Sparkman Drive, Huntsville, AL 35805 United States
AU: Gamayunov, K V
AF: NASA/MSFC, 320 Sparkman Drive, Huntsville, AL 35805 United States
AB: The effect of Electromagnetic Ion Cyclotron (EMIC) waves, generated by ion temperature anisotropy in Earth's ring current (RC), is the best known example of wave-particle interaction in the magnetosphere. Also, there is much controversy over the importance of EMIC waves on RC depletion. Under certain conditions, relativistic electrons, with energies 1-3 MeV, can be removed from the outer radiation belt (RB) by EMIC wave scattering during a magnetic storm. That is why the calculation of EMIC waves must be a very critical part of the space weather studies. The new RC model that we have developed and present for the first time has several new features that we have combine together in a one single model: (a) several lower frequency cold plasma wave modes are taken into account; (b) wave tracing of these wave has been incorporated in the energy EMIC wave equation; (c) no assumptions regarding wave shape spectra have been made; (d) no assumptions regarding the shape of particle distribution have been made to calculate the growth rate; (e) pitch-angle, energy, and mix diffusions are taken into account together for the first time; (f) the exact loss-cone RC analytical solution has been found and coupled with bounce-averaged numerical solution of kinetic equation; (g) the EMIC waves saturation due to their modulation instability and LHW generation are included as an additional factor that contributes to this process; and (h) the hot ions were included in the real part of dielectric permittivity tensor. We compare our theoretical results with the different EMIC waves models as well as RC experimental data.
DE: 2712 Electric fields (2411)
DE: 2788 Storms and substorms
DE: 7807 Charged particle motion and acceleration
SC: SPA-Magnetospheric Physics [SM]
MN: 2005 Joint Assembly