Differential Rotation of the Sun as a Source of Galactic Cosmic Rays Quasi-biennial Oscillations
2019 August 01
Quasi-biennial oscillations belong to the most prominent mid-term periodicities with a duration shorter than 11-year cycle and longer than solar rotation. Sunspot number and area, intensity of coronal green line, solar radio flux, number of H$\alpha$ flares, solar wind velocity, interplanetary magnetic field, as well as cosmic rays exhibit quasi-biennial oscillations in their temporal changes. However it was deeply studied, the source of the quasi-biennial oscillations is unrevealed yet. One of the concepts relates quasi-biennial oscillations to a high-frequency component of the solar dynamo functioning within the Sun's interior. Here, we propose as the origin of quasi-biennial oscillations of cosmic rays solar differential rotation.