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We deduce on hourly basis the spatial gradient of the cosmic ray density inthree dimensions from the directional anisotropy of high-energy (~50 GeV)galactic cosmic ray (GCR) intensity observed with a global network of muondetectors on the Earth's surface. By analyzing the average features of thegradient in the corotational interaction regions (CIRs) recorded in successivetwo solar activity minimum periods, we find that the observed latitudinalgradient (Gz) changes its sign from negative to positive on the Earth'sheliospheric current sheet (HCS) crossing from the northern to the southernhemisphere in A<0 epoch, while it changes from positive to negative in A>0epoch. This is in accordance with the drift prediction. We also find a negativeenhancement in Gx after the HCS crossing in both A<0 and A>0 epochs, but not inGy. This asymmetrical feature of Gx and Gy indicates significant contributionsfrom the parallel and perpendicular diffusions to the the gradient in CIRs inaddition to the contribution from the drift effect.

Drift effects and the average features of cosmic ray density gradient in CIRs during successive two solar minimum periods