where D is the diffusion coefficient in momentum space. According to Tverskoy (1978), Vasilyev et al. (1980), Bulanov and Pukhov (1981), near the shock front conditions are realized suitable for turbulence developing. For the developing of turbulence may also be important accelerated by shock wave particles (mainly from streaming instability) generated Alfven turbulence (Bell, 1978a,b; see also above, Chapter 3). In the case of Alfven turbulence, according to Skilling (1975)
where ua is the AlfVén velocity, and K// is the component of the space diffusion coefficient parallel to the magnetic field.
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