Cosmic ray kinetics in a strong large-scale magnetic field - A transverse diffusion

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Charged Particles, Cosmic Rays, Kinetic Theory, Magnetic Fields, Particle Diffusion, Anisotropy, Gyrofrequency, Interplanetary Magnetic Fields, Larmor Radius, Milky Way Galaxy

Scientific paper

A consistent theory of cosmic ray propagation in a strong large-scale random magnetic field (MF) is developed. If both the gyrofrequency of the particle around the lines of force of a large-scale MF and the characteristic frequency of random MF changes substantially exceed the collision frequency of particles in small-scale MF inhomogeneities, it is claimed that the large-scale MF fluctuations lead to transverse diffusion with respect to the mean MF direction. If the collision frequency is substantially higher than all other characteristic frequencies (i.e., if the diffusive regime is considered as basic), the fluctuations of the large-scale MF do not lead to the generation of additional transverse particle diffusion. Transport equations are derived in both the cases and the kinetic coefficients are determined for frozen - in magnetoturbulence.

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