Propagation of Galactic Cosmic Rays in the Heliosphere during Minimum Solar Activity Periods

• Published in: Kinematics and physics of celestial bodies 2024-04, Vol.40 (2), p.64-76
• Main Author: Fedorov, Yu. I.
• Format: Article
• Language: English
• Subjects: Angular distribution; Anisotropy; Astronomy; Boundary conditions; Cosmic ray propagation; Cosmic ray showers; Cosmic rays; Energy distribution; Energy spectra; Flux density; Galactic cosmic rays; Heliopause; Heliosphere; Interplanetary magnetic field; Interstellar space; Magnetic fields; Observations and Techniques; Physics; Physics and Astronomy; Polarity; Solar activity; Space missions; Space Physics; Transport equations
• ISSN: 0884-5913; 1934-8401
• DOI: 10.3103/S088459132402003X

Based on the cosmic ray transport equation, the propagation of charged high-energy particles in heliospheric magnetic fields is considered. The transport equation solution is found in the approximation of low anisotropy in the angular distribution of particles. The energy distribution of galactic cosmic rays at a heliopause is used as a boundary condition. The energy spectrum of cosmic rays in a local interstellar space is considered to be known due to the outstanding results of space missions (Pioneer, Voyager, PAMELA, AMS-02, etc.). The flux density of cosmic rays is calculated in the periods of different solar magnetic polarity. It is shown that the intensity of galactic cosmic rays in positive magnetic polarity periods is maximum near the helioequator. In the periods when the interplanetary magnetic field has a negative polarity, the intensity of cosmic rays decreases with increasing heliolatitude.