Abstract
The frequency distributions of the diurnal and hourly indices of magnetic activity and also the hourly values of the geoeffective parameters of the solar wind over the seasons of the year were analyzed. Confirmation of the equinoctial and summer maximums of magnetic activity was obtained and their statistical significance was shown. Arguments confirming the “axial” and “equinoctial” mechanisms of formation of the equinoctial maximums are presented. An assumption is made that the summer maximum could occur as a result of the existence on the Sun of active Carrington longitudes.
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