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  Validity of weak particle-field interaction theory for description of cosmic-ray particle diffusion in random magnetic-fields

Alpers, W., Hasselmann, K. F., & Kunstmann, J. (1978). Validity of weak particle-field interaction theory for description of cosmic-ray particle diffusion in random magnetic-fields. Astrophysics and Space Science, 58, 259-271. doi:10.1007/BF00644516.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-0536-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-053C-2
Genre: Journal Article

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Alpers1978_Article_OnTheValidityOfWeakParticle-fi.pdf (Publisher version), 727KB
 
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 Creators:
Alpers, Werner1, 2, Author
Hasselmann, Klaus F.2, Author              
Kunstmann, J.1, 2, Author
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1Institut für Geophysik, Universität Hamburg, ou_persistent22              
2MPI for Meteorology, Max Planck Society, ou_913545              

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 Abstract: Since considerable debate has arisen recently about the applicability of the weak-interaction theory for the description of cosmic-ray particle diffusion in random magnetic fields, a critical discussion of the conditions of validity of this theory is presented. It is pointed out that the singular behaviour of the diffusion coefficient at pitch angles of θ=90° does not lead to a breakdown of the weak-interaction theory, though an extension of pitch-angle scattering analysis to higher order may be necessary. In particular, an investigation of the δ-function contribution to the diffusion coefficient at pitch angles of 90° discovered by Fisket al. (1974) indicates that it has no influence on either pitch-angle scattering or the associated problem of particle diffusion parallel to the mean magnetic field. Although an infinite diffusion coefficient at 90° pitch angles implies a singualr breakdown of the weak-interaction theory at that point, the effects are purely local and are negligible when considering averaged particle properties

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Language(s): eng - English
 Dates: 1978
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: ISI: A1978GA75000001
DOI: 10.1007/BF00644516
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Title: Astrophysics and Space Science
Source Genre: Journal
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Publ. Info: Dordrecht, Holland : D. Reidel
Pages: - Volume / Issue: 58 Sequence Number: - Start / End Page: 259 - 271 Identifier: ISSN: 0004-640X
CoNE: https://pure.mpg.de/cone/journals/resource/954925565700