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

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.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0006-05B2-B Version Permalink: https://hdl.handle.net/21.11116/0000-0006-05B3-A
Genre: Journal Article

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1977ApJ___211__587K.pdf (Publisher version), 790KB
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 Creators:
Kunstmann, Jörn E.1, 2, Author
Alpers, Werner1, 2, Author
Affiliations:
1MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE, ou_913545              
2Institut für Geophysik, Universität Hamburg, ou_persistent22              

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 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.

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Language(s): eng - English
 Dates: 1977
 Publication Status: Issued
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 Rev. Type: Peer
 Identifiers: ISI: A1977CT82800033
DOI: 10.1086/154967
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: American Astronomical Society
Pages: - Volume / Issue: 211 Sequence Number: - Start / End Page: 587 - 595 Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3