Peculiarities of quasi-periodic variations of large-scale solar magnetic fields and of solar wind properties

Abstract

An analysis is made of variations in length of quiescent solar filaments and of solar wind parameters. The study revealed some peculiarities of annual and quasi-biennial variations of these characteristics; in particular, it was found that in March–April of the odd years there is a significant increase in the number of days occupied by high speed streams, which triggers a substantial enhancement of geomagnetic activity. It is shown that the dynamics of large-scale solar magnetic fields are quite well manifested in the particle flux density of the solar wind for different velocity regimes and the occurrence frequency of high ( V > 500 km s −1) and low ( V < 400 km s −1) solar wind velocities. We discuss the possible changes of solar magnetic fields which could be responsible for the observed variations of these parameters. We analyse, in terms of a solar wind formation model developed by the present authors, the relationship between the variability of large-scale solar magnetic fields and properties of the solar wind for its different formation regimes.