coming into the region 2, Ok should be substituted for Y - 62k • The final pitch angle is determined by Eq. 4.15.38. Particle acceleration in the interaction with a rotational discontinuity is determined by the Eq. 4.15.34 but Ay is defined in it by Eq. 4.15.41. In particular, for the particles reflected from the discontinuity plane Ap z = 2 P z and

AEk =r~TTiW = 22E ,2 [zHn - E(macc2 + Ek)], (4.15.42) (1 - U Ic2 ) Hn - |E|

where p'z is the z component of a particle momentum in the system K'. For non-relativistic particles (Ek << macc ) we have

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