If these waves are isotropically distributed over a space and are statistically independent, the correlation tensor of the second rank corresponding to a stochastic magnetic field, has the following form:

(Hy(k,oo)Hv(k ',o')) = Bv(k )S(k + k')S(o+ o')S(o+ o(k )),

Substituting the Eq. 2.6.3 and Eq. 2.6.4 into Eq. 2.6.1, we obtain

dpa dPJ fyz and in this case

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