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Using measurements from the PAMELA and ARINA spectrometers onboard the RESURSDK-1 satellite, we have examined the 27-day intensity variations in galacticcosmic ray (GCR) proton fluxes in 2007-2008. The PAMELA and ARINA data allowfor the first time a study of time profiles and the rigidity dependence of the27-day variations observed directly in space in a wide rigidity range from ~300MV to several GV. We find that the rigidity dependence of the amplitude of the27-day GCR variations cannot be described by the same power-law at both low andhigh energies. A flat interval occurs at rigidity R = <0.6-1.0> GV with apower-law index gamma = - 0.13+/-0.44 for PAMELA, whereas for R >= 1 GV thepower-law dependence is evident with index gamma = - 0.51+/-0.11. We describethe rigidity dependence of the 27-day GCR variations for PAMELA and ARINA datain the framework of the modulation potential concept using the force-fieldapproximation for GCR transport. For a physical interpretation, we haveconsidered the relationship between the 27-day GCR variations and solar windplasma and other heliospheric parameters. Moreover, we have discussed possibleimplications of MHD modeling of the solar wind plasma together with astochastic GCR transport model concerning the effects of corotating interactionregions.

Study of the 27-day variations in GCR fluxes during 2007-2008 based on PAMELA and ARINA observations