The 11-year solar cycle, the 27-day Sun's rotation and the area of the stratospheric Aleutian high

The effect of the 11-year solar cycle on the 30-hPa geopotential height and temperature fields in the area of the Aleutian high caused by solar activi ty oscillations resulting from the Sun's rotation (27.2 d) is investigated, applying methods of statistical cross-spectral analysis to daily data for the period from 1965 to 1998. The area of the stratospheric Aleutian high i s considered as an "indicator" of the solar influence on the winter stratos phere proceeding from the results by LABITZKE and VAN LOON (1988), and VAN LOON and LABITZKE (1990). An effect of the 11-year solar cycle on the respo nse of the summer middle stratosphere to solar activity oscillations on the time scale of the Sun's rotation is not found. In contrast to summer, the atmospheric responses in winter demonstrate clear differences between maxim um and minimum of the 11-year solar cycle for the 27.2 d solar rotation per iodicity and for the two other oscillations of 29.4 d and 25.3 d, resulting from the modulation of the 27.2 d solar-induced periodicity by the annual atmospheric variation. The atmospheric response for the fourth periodicity studied. the 17 d oscillation, which is supposed to be a normal mode of the atmosphere, close to the known 16-day wave (MADDEN, 1978). also shows a cl ear dependence on the 11-year solar cycle. For all the periodicities studie d the coherence between the 10.7 cm solar radio flux and the 30-hPa height/ temperature fields in the Aleutian high area in winter is on the average st ronger at maxima than at minima of the 11-year solar cycle. The correspondi ng amplitudes of the solar-induced geopotential height and temperature pert urbations are also larger at high than at low solar activity, with the larg est differences revealed at the moderate and polar latitudes. Thus, we conc lude that the response of the winter 30-hPa height/temperature fields in th e area of the Aleutian high to solar oscillations on the time scale of the Suns rotation is on the average stronger at high than at low solar activity . We suppose that the influence of the 11-year solar cycle on the stratosph eric Aleutian high area includes the modulation of the intensity of interac tion between the solar induced 27 d oscillation and seasonal atmospheric va riations.