Solar UV light is primarily responsible for both creation and destruction of ozone in the earth's stratosphere and mesosphere. Ozone is the molecular form of oxygen which shields the Earth's surface from solar UV-B radiation through their absorption. The same process also causes the temperature in the stratosphere to be higher than in the upper troposphere. Stratospheric ozone densities are known to vary with the 11 year solar cycle. Solar variability over the solar cycle causes expansion and contraction of the outward extension of the Earth's atmosphere into space. Scientists will use SUSIM data along with constituent, dynamical, and other radiation measurements made by UARS instruments to better model the processes occurring in the earth's upper atmosphere particularly involving the creation and destruction of ozone.