Strong cosmic-ray scattering in an anisotropic random magnetic field |
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Authors: | Yu P Mel’nikov I N Toptygin |
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Institution: | (1) St. Petersburg State Technical University, ul. Politekhnicheskaya 29, St. Petersburg, 195251, Russia |
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Abstract: | We calculate the kinetic coefficients and the transport mean free paths of high-energy particles parallel to the regular magnetic field in the approximation of a large-scale anisotropic random magnetic field by using a nonlinear collision integral, i.e., by taking into account the processes of strong random scattering. We consider the diffusion of solar and Galactic cosmic rays by two-dimensional turbulence. Strong random scattering by two-dimensional turbulence is shown to reduce the parallel transport mean free path several fold. The momentum dependence of the parallel mean free path does not change, Λ∥ ∝ p2?v. In the case of strong random scattering by turbulence formed by several modes, the parallel transport mean free path is Λ∥ ∝ p. We show that two-dimensional turbulence can make a major contribution to the parallel transport mean free paths of cosmic rays in the heliosphere and the interstellar medium. |
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Keywords: | cosmic rays nonthermal radiation diffusion interplanetary medium interstellar medium |
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