On the dependence of maximum GCR intensity on heliospheric factors for the last five sunspot minima
| Autor: | Marius Potgieter, Mikhail Krainev, O. P. M. Aslam, Donald Ngobeni, Mikhail Kalinin |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Atmospheric Science Sunspot 010504 meteorology & atmospheric sciences Proton Polarity (physics) Aerospace Engineering Astronomy and Astrophysics Cosmic ray Astrophysics 01 natural sciences Magnetic field Intensity (physics) Maxima and minima Geophysics Space and Planetary Science Physics::Space Physics 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics General Earth and Planetary Sciences 010303 astronomy & astrophysics Heliosphere 0105 earth and related environmental sciences |
| Zdroj: | Advances in Space Research. 68:2953-2962 |
| ISSN: | 0273-1177 |
| DOI: | 10.1016/j.asr.2021.05.021 |
| Popis: | Effects on galactic cosmic rays (GCRs) of several heliospheric factors during the minimum phases of the sunspot cycles are studied. Times of maximum GCR intensity are determined for the last five sunspot minima, including the present one, together with the corresponding main heliospheric factors important for the modulation of GCRs in the heliosphere. The quantitative relation between these factors and the solar magnetic field is studied with the poloidal magnetic field of the Sun considered as a governing factor for many heliospheric characteristics during sunspot minima. The dependence of GCR proton spectra on these heliospheric factors for the last five sunspot minima 21/22–24/25 is calculated and discussed. Special attention is paid to the energy at which spectral cross-overs occur for consecutive minima, related to the changing polarity of the heliospheric magnetic field. The long-term observational series on GCR proton modulation at the Earth are considered with respect to the energy of these cross-overs. |
| Databáze: | OpenAIRE |
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