Abstract

Pitch-angle scattering of relativistic particles by Alfven wave turbulence is considered. Allowance is made for both resonant scattering by harmonics lambda less than or equal to R/sub H/(E) (lambda is the wavelength, and R/sub H/(E) is the relativistic gyroradius) as well as mirroring of particles by harmonics with lambda >> R/sub H/(E). It is shown that for any anisotropy of the wave distribution the transport coefficient of the pitch-angle scattering is an even function of the cosine of the pitch angle. In the case of turbulence with a power-law spectrum, two types of anisotropy of the turbulence are considered: (A) one dimensional, (B) isotropic. Comparison of the theory with observational data on the diffusion coefficient of galactic cosmic rays makes it possible to estimate the parameters of the Alfven wave turbulence; these are found to be very different in cases A and B

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