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Cosmic ray acceleration by shocks related with Slipping Interaction Regions(SIRs) in the Galactic Wind is considered. SIRs are similar to Solar WindCorotating Interaction Regions. The spiral structure of our Galaxy results in astrong nonuniformity of the Galactic Wind flow and in SIR formation atdistances of 50 to 100 kpc. SIRs are not corotating with the gas and magneticfield because the angular velocity of the spiral pattern differs from that ofthe Galactic rotation. It is shown that the collective reacceleration of thecosmic ray particles with charge $Ze$ in the resulting shock ensemble canexplain the observable cosmic ray spectrum beyond the "knee" up to energies ofthe order of $10^{17}Z$ eV. For the reaccelerated particles the Galactic Windtermination shock acts as a reflecting boundary.Comment: LATEX, 14 pages, 7 figures, accepted to A&

Cosmic ray acceleration by spiral shocks in the galactic wind