Asymmetric diffusion of cosmic rays / Medvedev Mikhail V.,Medvedev Viktor V. // PHYSICS OF PLASMAS. - 2015. - V. 22, l. 9.

ISSN/EISSN:

1070-664X / 1089-7674

Type:

Article

Abstract:

Cosmic ray propagation is diffusive because of pitch angle scattering by waves. We demonstrate that if the high-amplitude magnetohydrodynamic turbulence with (B) over tilde/< B > similar to 1 is present on top of the mean field gradient, the diffusion becomes asymmetric. As an example, we consider the vertical transport of cosmic rays in our Galaxy propagating away from a point-like source. We solve this diffusion problem analytically using a one-dimensional Markov chain analysis. We obtained that the cosmic ray density markedly differs from the standard diffusion prediction and has a sizable effect on their distribution throughout the galaxy. The equation for the continuous limit is also derived, which shows limitations of the convection-diffusion equation. (C) 2015 AIP Publishing LLC.

Author keywords:

MAGNETIC-FIELD

DOI:

10.1063/1.4928942

Web of Science ID:

ISI:000362571800014

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	SEP
Publisher	AMER INST PHYSICS
Address	1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
Language	English
Article-Number	091504
EISSN	1089-7674
Keywords-Plus	MAGNETIC-FIELD
Research-Areas	Physics
Web-of-Science-Categories	Physics, Fluids \& Plasmas
Funding-Acknowledgement	NSF {[}AST-0708213]; DOE {[}DE-FG02-07ER54940]
Funding-Text	This work has been supported by NSF grant AST-0708213 and DOE grant DE-FG02-07ER54940.
Number-of-Cited-References	11
Usage-Count-Since-2013	1
Journal-ISO	Phys. Plasmas
Doc-Delivery-Number	CT1PM