Solar Research Group
Researchers: Jan Sojka, Michael David, and Joseph Jenson are collecting solar irradiance observations from the NASA Solar Observatory EVE instrument and using them to drive the USU TDIM ionospheric model. These observations are the first to reveal the rich variability in the solar "sunlight" ultra violet spectrum. These are the photons that create our dayside ionosphere. In turn it is this ionosphere, during solar flares, that disrupts all sorts of radio propagation: emergency HF radio communications, accuracy of GPS positioning and all Earth to satellite communications. The research is to understand in depth the response of the ionosphere to the solar variability in the ultra-violet spectrum.