Study of the 27-day variations of GCR in 2007-2008 based on PAMELA and ARINA observations
July 22, 2019
July 02, 2021
We have investigated the energy and time dependences of the amplitude of the proton galactic cosmic ray intensity 27-days oscillations in 2007-2008 from the data of the PAMELA and ARINА spectrometers on board the RESURS DK-1 satellite. We have used different types of harmonic analysis, such as Fourier and wavelet analysis. The time profiles and amplitude dependences for the rigidities of cosmic ray particles from ~300 MV to tens of GV were obtained. It is shown that the amplitude-rigidity dependence cannot be described by a power law at low energies, the amplitude decreases with decreasing rigidity starting from ~ 1 GV. For a physical interpretation, we have studied the relationship between the 27-day variations of GCR and heliospheric parameters: solar wind velocity and heliospheric magnetic field.
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