Nondiffusive propagation of cosmic rays in the solar system and in extragalactic radio sources

Details Nondiffusive propagation of cosmic rays in the solar system and in extragalactic radio sources Nondiffusive propagation of cosmic rays in the solar system and in extragalactic radio sources

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..301e&link_type=abstract

Astrophysical Journal, vol. 206, May 15, 1976, pt. 1, p. 301-311.

Astronomy and Astrophysics

Astrophysics

21

Cosmic Rays, Extragalactic Radio Sources, Particle Motion, Propagation Modes, Solar Electrons, Interplanetary Space, Morphology, Particle Density (Concentration), Solar Flares, Solar System

Scientific paper

If charged particles are scattered by random magnetic fields while they propagate along the diverging lines of force of a spatially inhomogeneous guiding field, the diffusive mode of transport, which occurs when adiabatic focusing is weak compared to scattering, gives way to novel coherent modes when focusing becomes dominant. This paper begins with a nonmathematical discussion of the higher-order transport phenomena that underlie these modes, and goes on to explore some astrophysical implications of their existence. In an interplanetary context, one of the new modes, the supercoherent mode, corresponds exactly to the 'scatter-free' propagation of kilovolt solar-flare electrons. Moreover, quasi-diffusive propagation in the presence of moderately strong focusing offers an explanation of several poorly understood aspects of solar cosmic-ray events. On a much larger scale, focused transport provides an interpretation of many observed characteristics of extragalactic radio sources. In particular, their double structure is explained in terms of basic transport phenomena.

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