Spectral and temporal variations of the residual attenuation in the near UV region

Data of high-altitude observations of the variability of optical spectral densities in the 320-430-nm region and of the total water-vapor and ozone content, which were obtained in periods of the maxima and minima of the current and preceding cycles of solar activity, are analyzed. Corpuscular fluxes are found to influence the midlatitude troposphere only after solar flares. Solar radiation in the centimeter and the millimeter ranges directly affects the microphysical state of water vapor, thereby changing the radiative and thermal regime of the troposphere and stratosphere.