Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43b1482k&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM43B-1482
Physics
2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped
Scientific paper
The self-consistent treatment of ring current (RC) ion dynamics and electromagnetic ion cyclotron (EMIC) waves, which are thought to exert important influences on dynamic ion evolution and are an important missing element in our understanding of the storm-and recovery-time ring current evolution. For example, the EMIC waves cause the RC decay on a time scale of about one hour or less during the main phase of storms. The oblique EMIC waves damp due to Landau resonance with the thermal plasmaspheric electrons, and subsequent transport of the dissipating wave energy into the ionosphere below causes an ionosphere temperature enhancement. Under certain conditions, relativistic electrons, with energies ~1 MeV, can be removed from the outer radiation belt by EMIC wave scattering during a magnetic storm. That is why the modeling of EMIC waves is a critical and timely issue in magnetospheric physics. This study will generalize the self-consistent theoretical description of RC ions and EMIC waves that has been developed by Khazanov et al. [2002, 2003] and include the heavy ions and propagation effects of EMIC waves in global dynamic modeling of self-consistent RC - EMIC waves coupling. The results of our newly developed model will be presented, focusing mainly on the dynamics of EMIC waves and comparison of these results with the previous global RC modeling studies devoted to EMIC waves formation. We will also discuss RC ion precipitations and wave induced thermal electron fluxes into the ionosphere.
Gallagher Dennis
Gamayunov Konstantin
Khazanov George V.
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