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Introduction

Since the discovery of the solar activity periodicity, attempts have been made to find a connection between the solar cycle and the terrestrial climate [1]. However, the results are ambiguous. For different periods and locations, both positive and negative correlations have been found between solar activity parameters and meteorological elements like surface air temperature, sea level pressure, precipitation, etc. [2] Labitzke and van Loon [3] have demonstrated that the picture significantly improves if the data is stratified according to the phase of the quasibiennial oscillation of stratospheric winds (QBO). This fact has no explanation. Moreover, the mechanism of the quasibiennial oscillation itself is not clear, though QBO signals have been identified in a number of geophysical parameters. It was only natural to seek for a connection with solar activity, and similar periodicities were found in solar parameters like sunspot numbers [4], solar radio flux [5], solar neutrino [6], green coronal acticity [7], etc. This fact could be interpreted as an indication that the quasibiennial oscillations in stratospheric winds are triggered by the quasibiennial oscillations in solar activity.