Deceleration and acceleration of cosmic rays in the solar wind

J. R. Jokipii

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Recent observations of the deceleration of low-energy solar cosmic rays in the solar wind are discussed in the context of cosmic-ray transport theory. It is concluded that the rate of deceleration is much slower than would be produced by adiabatic energy change due to the observed expansion of the plasma, so that a competing acceleration process must be operative. Second-order Fermi acceleration by hydromagnetic waves, acting together with adiabatic energy change, is shown to provide a natural interpretation of the observations.

Original languageEnglish (US)
Pages (from-to)666-669
Number of pages4
JournalPhysical review letters
Issue number11
StatePublished - 1971
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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