Abstract
We study quasi-periodical changes in the amplitudes of the 27-day variation of the galactic cosmic ray (GCR) intensity, and the parameters of solar wind and solar activity. We have recently found quasi-periodicity of three to four Carrington rotation periods (3 – 4 CRP) in the amplitudes of the 27-day variation of the GCR intensity (Gil and Alania in J. Atmos. Solar-Terr. Phys. 73, 294, 2011). A similar recurrence is recognized in parameters of solar activity (sunspot number, solar radio flux) and solar wind (components of the interplanetary magnetic field, solar wind velocity). We believe that the 3 – 4 CRP periodicity, among other periodicities, observed in the amplitudes of the 27-day variation of the GCR intensity is caused by a specific cycling structure of the Sun’s magnetic field, which may originate from the turbulent nature of the solar dynamo.
Highlights
Various periodicities in the temporal changes of the galactic cosmic ray (GCR) intensity have been studied rather intensively up to the present time
We assume that the observed quasi-periodic variability with a 3 – 4 CRP recurrence is related to the cycling structure of the solar magnetic field resulting from the turbulent solar dynamo
Our purpose in this paper is to study features of the 3 – 4 CRP cycling of the 27-day variations of the GCR intensity, and the solar activity and solar wind parameters
Summary
Various periodicities in the temporal changes of the galactic cosmic ray (GCR) intensity have been studied rather intensively up to the present time. We found (Gil and Alania, 2011) a clear recurrence in the temporal changes of the amplitudes of the 27-day variation of the GCR intensity, and in parameters of solar activity (SA) and solar wind.
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