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Journal Article

A perturbation approach to coherent propagation of energetic charged particles in random magnetic fields

MPS-Authors

Kunstmann,  Jörn E.
MPI for Meteorology, Max Planck Society;
Institut für Geophysik, Universität Hamburg;

Alpers,  Werner
MPI for Meteorology, Max Planck Society;
Institut für Geophysik, Universität Hamburg;

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1977ApJ___211__587K.pdf
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Citation

Kunstmann, J. E., & Alpers, W. (1977). A perturbation approach to coherent propagation of energetic charged particles in random magnetic fields. The Astrophysical Journal, 211, 587-595. doi:10.1086/154967.


Cite as: https://hdl.handle.net/21.11116/0000-0006-05B2-B
Abstract
The Fokker-Planck equation describing the propagation of charged particles in magnetic fields that consist of a dominant constant guiding field and superposed random fluctuations is solved by applying the perturbation method of dividing the total particle density into an averaged isotropic and a small anisotropic component. A particle transport equation is derived which describes the 'coherent' propagation of a particle pulse whose center moves at half the constant total particle velocity in either the positive or negative direction. The range of validity of the coherent solution is examined, and the general formulas for coherent propagation are applied to the slab, isotropic, and Alfven-wave models of magnetic-field fluctuations. Ranges of magnetic-fluctuation spectral indices are identified over which diffusive and coherent particle-transport modes can exist in the three models considered.