The response of atmospheric ozone and temperature to variations in the solar ultraviolet irradiance over time scales corresponding to the solar rotation period is examined using a one-dimensional, time-dependent radiative-photochemical model of the upper stratosphere and lower mesosphere. The model uses temporally varying measurements of the solar irradiance in the 120- to 300-nm range made by the Solar Mesospheric Explorer satellite. Calculations of the amplitude and phase of the ozone response due to solar UV oscillations made by the model show that the effects of the coupling of radiation and photochemistry in the region near the stratopause may not be neglected. At 0.85 mbar the computed 27-day 0.6 K temperature variation decreases the amplitude of the corresponding response over the solar rotation period by 25%. The occurrence of small phase leads (up to 1.5 days) in the response of ozone with respect to the solar UV variations may also be explained in light of the radiative photochemical coupling.