Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apjs..131..519v&link_type=abstract
The Astrophysical Journal Supplement Series, Volume 131, Issue 2, pp. 519-529.
Astronomy and Astrophysics
Astronomy
12
Ism: Cosmic Rays, Magnetic Fields, Plasmas, Scattering, Turbulence
Scientific paper
Transport of charged particles in cold plasma is considered. The full dispersion relation for slab-mode waves is employed, and the quasi-linear particle scattering is discussed. Previous results of the dispersive-wave model on the ion mean free path are recalled and further developed. For small cross-helicities, the model predicts ion mean free paths that are not affected by the steepening of the turbulence spectrum at high wavenumbers, if the dissipation-range spectral index is q<6. Large cross-helicities, |Hc|~1, of the left-hand polarized waves, however, imply an approximately constant mean free path of the nonrelativistic protons, which may account for the long-standing flatness problem of the mean free path of solar flare particles. The mean free path in a mixture of slab-mode and isotropic fast-mode waves is also shown to agree with observations only in the case of |Hc|~1, contradicting a previously published result. Finally, it is shown that, owing to an interplay of resonances with whistlers and proton-cyclotron waves, electron bulk speeds can be considerably larger than the Alfvén speed. This implies limitations on diffusive acceleration of electrons at low Mach number shocks below ultrarelativistic energies.
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