Effect of short-term solar UV variations on the stratospheric circulation

The behavior of the Sazonov index, which characterizes the intensity of the meridional circulation at a level of 30 hPa in the mid- and high-latitude winter stratospheres as a function of the short-term (tau less than or equa l to 27 days) solar UV variation, has been studied. The MgII index, whose v ariations are associated with solar activity and characterize the intensity of the chromospheric emission in the midultraviolet range of wavelengths ( lambda less than or equal to 280 nm), which is of prime importance in the s tratosphere dynamics, is used as a characteristic of solar UV irradiance. T he relationship between the short-term variations in solar activity shown i n the MgII-index changes, and: the atmospheric circulation disturbances at a level of 30 hPa has been uncovered. It has been indicated that the increa sed and decreased values of the MgII index correspond to the intensified an d weakened stratospheric circulation disturbances, respectively. This relat ionship between the level of solar UV irradiance and the intensity of the m eridional circulation at a level of 30 hPa depends on the quasi-biennial pe riodicity, phase of the 11-year solar cycle, and degree of solar disturbanc e during the specific period (SCR bursts).