Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm23a0485h&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM23A-0485
Physics
7827 Kinetic And Mhd Theory, 7839 Nonlinear Phenomena, 7843 Numerical Simulation Studies, 7867 Wave/Particle Interactions, 2772 Plasma Waves And Instabilities
Scientific paper
Shear Alfvén waves in the Earth's magnetosphere are investigated by a two-dimensional (2D) nonlinear gyrokinetic(GKE)-magnetohydrodynamic (MHD) hybrid simulation code based on the analytical formulation for two-component (core and energetic) plasmas [Frieman and Chen, 1982; Chen and Hasegawa, 1991]. While the core component, as the ideal MHD fluid, supports the Alfvén wave oscillations, the energetic component provides the kinetic instability drive via wave-particle resonances. Our preliminary studies have indicated that, given sufficiently strong energetic-particle drive, the excited Alfvén-ballooning modes can be radially trapped in the maximal kinetic drive region to form a 2D global unstable eigenmode; contrast to MHD predictions of no radial potential well structures. In the nonlinear state, our present focus is on the saturation mechanism of a coherent single-m (the azimuthal wavenumber) unstable eigenmode. Specifically, we will explore nonlinear saturation via spatial detuning of wave-particle resonances due to the wave-induced radial excursions of energetic particles. Detailed 2D global stability features and saturation processes will be presented. Work supported by NSF and DOE Grants.
Chen Leon L.
Hu Shuang
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