Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..977h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 197, Dec. 1981, p. 977-993.
Astronomy and Astrophysics
Astronomy
4
Astronomical Models, Cosmic Rays, Interstellar Magnetic Fields, Interstellar Matter, Magnetic Anomalies, Scintillation, Magnetohydrodynamic Stability, Particle Motion, Pulsars
Scientific paper
Large scale (approximately 15 pc) turbulence in the interstellar medium (ISM) causes the firehose and mirror instabilities to occur. These produce small scale (approximately 10 to the -7th pc) magnetic irregularities, which scatter cosmic rays. Pulsar scintillation data and a model of the origin of these scintillations are used to construct a slab model of the turbulent ISM. The amplitudes and wavelengths of the magnetic irregularities that arise are then found, and the coefficients for the diffusion of cosmic rays along the interstellar magnetic fields are calculated. This diffusion is incorporated into the model of the turbulent ISM, and it is shown that it can account naturally for both the lifetime of low energy cosmic rays, and the variation of their mean pathlength with energy. The model has no galactic halo, and contains no scattering by Alfven waves.
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