Speaker
Description
We have investigated the energy/rigidity dependence of the amplitude of the long-term galactic cosmic ray variations described by the power-law fitting over the solar cycle. For a physical interpretation, we have considered the relationship between long-term galactic cosmic ray variations and heliospheric magnetic field.
The apparent solar cycle variability can be seen in the time profile of the spectral index $\gamma$ of the power-law rigidity spectrum of long-term galactic cosmic ray variations for 2006-2018 during solar cycle 24. The spectral index $\gamma$ shows a tendency to be higher for the solar maximum phase compared to the solar minimum phase. Furthermore, we find the evidence of the energy-dependent rigidity spectrum of the long-term galactic cosmic ray variations observed by AMS-02.
We reveal the soft rigidity spectrum of the galactic cosmic ray isotropic intensity variations for the solar maximum and the hard rigidity spectrum for the solar minimum owing to the essential temporal rearrangements of the structure in the energy range of the heliosheric magnetic field turbulence from the maxima to minima epoch of solar activity. The long-term GCR variations by AMS-02 show the softening of the spectra toward higher energies.
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