stratopause

The stratopause is the boundary between the stratosphere and the mesosphere, located at an altitude of approximately 50 km (30 miles). The stratosphere itself is a layer of Earth's atmosphere situated above the troposphere and below the mesosphere. Within the stratosphere, temperatures generally increase with altitude, a phenomenon largely due to the presence of the ozone layer, which absorbs ultraviolet radiation from the sun. This absorption process dissociates oxygen molecules, leading to the formation of ozone, which then absorbs more UV radiation, causing the temperature to rise. The stratosphere extends from the tropopause, around 10-17 km, up to the stratopause.12