represent the scalar coefficient of diffusion and the unit vector in the direction of the regular component of magnetic field. In Eq. 2.11.26 Tjp (j = 1,2,3...9) are the tensors of the fourth rank which are symmetric with respect to the first and the second pairs of indices:

Tik<xP = SikSa

Tlkl/3 = hihkSaj3, Tika/3 = (V4fekhahj + Sifihkha + 8kahi hj + 8jhiha )

T!klj3= hihkhah j, Ta = (1/4)(a£j + 8ij3£aky + Ska£jy + ^jay^y, (21128)

Tikl]3 = (1l4))£;j3ykhiha + £akyhihj + £jiyhkh a + £cayhkh j

where £apy is the unit anti-symmetric tensor of the third rank. Tensors Akap ( =

1,2,3,4, and 5) in Eq. 2.11.27 are symmetric relative to the first pair of indices and anti-symmetric with respect to the second pair:

Akap = (l/4fehkhp + Skahihp - Sphkha - Skphiha\ A\klp = (l/4))Sia£pky + Skcc£/3iy - Sip£cky - Skp£cay )hy, 4klp = (l/4)(hiha + £fiiyhkha - £akyhihp - £oiyhkhp)hy

When deducing the set of Eq. 2.11.24-2.11.26, the terms of order of (u2/v 2)«, (u/v2 )j, and faj were hold and the terms of higher orders were omitted, taking into account that u/v << 1. After solving the Eq. 2.11.25 relative to I, we have the relation obtained in Section 2.11.1:

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