Abnormal Quasi-Recurrent Variations of Cosmic Rays in September 2014–February 2015.

An anomaly in the behavior of galactic cosmic rays in September 2014–February 2015 was studied, which manifested itself as significant modulation of their flux with a period close to the Sun's rotation. The state of the solar magnetic field and changes in the parameters of the solar wind and interplanetary magnetic field during the specified period are analyzed. The reasons for the longitudinal asymmetry in the distribution of galactic cosmic rays in the inner heliosphere are discussed. It has been established that the studied period is divided into two parts with different physical conditions on the Sun. Conclusions are drawn on the decisive joint influence of sporadic and recurrent events: repeatedly renewed "magnetic traps" created by successive coronal mass ejections from the same longitudinal zone, and anomalously expanded polar coronal holes with an enhanced magnetic field. [ABSTRACT FROM AUTHOR]