PoS - Proceedings of Science
Volume 358 - 36th International Cosmic Ray Conference (ICRC2019) - SH - Solar & Heliospheric
Study of the 27-day variations of GCR in 2007-2008 based on PAMELA and ARINA observations
R. Modzelewska*, G. Bazilevskaya, M. Boezio, S.V. Koldashov, M.B. Krainev, A. Mayorov, M.A. Mayorova, R. Munini, I.K. Troitskaya, R.F. Yulbarisov  on behalf of the PAMELA collaboration
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Pre-published on: July 22, 2019
Published on: 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.
DOI: https://doi.org/10.22323/1.358.1128
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