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On resonant interactions of ions with plasma waves in a reduced quasi-linear theory

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Author(s): E. Marsch

Journal: Nonlinear Processes in Geophysics
ISSN 1023-5809

Volume: 9;
Issue: 2;
Start page: 69;
Date: 2002;
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ABSTRACT
Based on quasi-linear theory (involving pitch angle scattering), the resonant interactions between ions and waves in an anisotropic multi-component plasma are discussed. In particular, electromagnetic Alfvén and ion-cyclotron waves propagating along or obliquely to the magnetic field are considered. A set of reduced (with respect to the perpendicular velocity component) quasi-linear diffusion equations is derived, involving reduced 1-D velocity distribution functions (VDFs), as they occur in wave dispersion relations. A 2-D model VDF can be constructed when using the Gaussian approximation. Wave-particle heating and acceleration rates are calculated.
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