Scattering of energetic particles by anisotropic magnetohydrodynamic turbulence with a Goldreich-Sridhar power spectrum

被引:167
作者
Chandran, BDG [1 ]
机构
[1] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
关键词
D O I
10.1103/PhysRevLett.85.4656
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Scattering rates for a Goldreich-Sridhar (GS) spectrum of anisotropic, incompressible, magnetohydrodynamic turbulence are calculated in the quasilinear approximation. Because the small-scale fluctuations are constrained to have wave vectors nearly perpendicular to the background magnetic field, scattering is too weak to provide either the mean-free paths commonly used in Galactic cosmic-ray propagation models or the mean-free paths required for acceleration of cosmic rays at quasiparallel shocks. Where strong pitch-angle scattering occurs, it is due to fluctuations not described by the GS spectrum, such as fluctuations generated by streaming cosmic rays.
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页码:4656 / 4659
页数:4
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