Cosmic-ray streaming perpendicular to the mean magnetic field - II: The gyrophase distribution function

M. A. Forman, J. R. Jokipii

Research output: Contribution to journalArticle

5 Scopus citations


The distribution function of cosmic rays streaming perpendicular to the mean magnetic field in a turbulent medium is re-examined. Urch's (1977) discovery that, in quasilinear theory, the flux is due to particles at 90° pitch angle is discussed and shown to be consistent with previous formulations of the theory. We point out that this flux of particles at 90° cannot be arbitrarily set equal to zero, and hence we dismiss the alternative theory which proceeds from this premise. A further, basic inconsistency in Urch's new transport equation is demonstrated, and the connection between quasilinear theory and compound diffusion is discussed.

Original languageEnglish (US)
Pages (from-to)507-513
Number of pages7
JournalAstrophysics and Space Science
Issue number2
StatePublished - Feb 1 1978


ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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