APS April Meeting 2013
The EVE instrument of the NASA Solar Dynamics Observatory (SDO) provides for the ﬁrst time EUV and XUV measurements of the solar irradiance that adequately deﬁne the major source of ionization of the atmosphere. In our study we modeled the E-region of the ionosphere and analyzed how it is aﬀected by the solar irradiance data obtained by EVE and contrast this with the S2000 Solar Irradiance model, used previously. The ionosphere has two major layers, the E-layer at 100 km, and the F-layer at 300 km. The diﬀerence in solar irradiances are small except at some wavelength bands, it is these diﬀerences that lead to a better understanding of the physical/chemical processes of the E-region. Observations of the ionospheric layers is best achieved using incoherent scatter radars (ISR). We have compared our model with ISR data available from Arecibo Puerto Rico in an eﬀort to understand how speciﬁc solar irradiance wavelength bands aﬀect the E-region. This study focuses on two speciﬁc wavelength bands 0.1-15 nm and 91-103 nm. Both are responsible for E-region production, but in quite diﬀerent manners.
Jensen, Joseph B.; Sojka, Jan J.; David, Michael; Tobiska, Kent; Schunk, Robert W.; Woods, Tom; and Eparvier, Frank, "Resolving Ionospheric E-region Modeling Challenges: The Solar Photon Flux Dependence" (2013). APS April Meeting 2013. Browse All Undergraduate research. Paper 27.