-(ui0«j -2a2(uioWo)+ 2(uio«)(Wo«)-v2ro2-(W>)}, (4.20.15) Wo = Viuio/v + V2U2o v =(uio^2 + U2o^1 )l +^2 )• (4.20.16)
The first member in the right hand side of Eq. 4.20.10 contains two terms: the first describes the anisotropic diffusion characterized by diffusion tensor Eq. 4.20.12 and the second describes the change of particle energy caused by convective moving of particles with effective speed determined by Eq. 4.20.16. The second term in the right hand side of Eq. 4.20.10 describes particle acceleration; to understand the meaning of this term let us consider the case when Bo = 0.
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