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We analyze the short cosmic ray intensity increase ("cosmic ray burst": CRB)on June 22, 2015 utilizing a global network of muon detectors and derive theglobal anisotropy of cosmic ray intensity and the density (i.e. theomnidirectional intensity) with 10-minute time resolution. We find that the CRBwas caused by a local density maximum and an enhanced anisotropy of cosmic raysboth of which appeared in association with Earth's crossing of the heliosphericcurrent sheet (HCS). This enhanced anisotropy was normal to the HCS andconsistent with a diamagnetic drift arising from the spatial gradient of cosmicray density, which indicates that cosmic rays were drifting along the HCS fromthe north of Earth. We also find a significant anisotropy along the HCS,lasting a few hours after the HCS crossing, indicating that cosmic rayspenetrated into the inner heliosphere along the HCS. Based on the latestgeomagnetic field model, we quantitatively evaluate the reduction of thegeomagnetic cut-off rigidity and the variation of the asymptotic viewingdirection of cosmic rays due to a major geomagnetic storm which occurred duringthe CRB and conclude that the CRB is not caused by the geomagnetic storm, butby a rapid change in the cosmic ray anisotropy and density outside themagnetosphere.

Cosmic ray short burst observed with the Global Muon Detector Network (GMDN) on June 22, 2015