Authors: Tom Woods, Frank Eparvier, Gary Rottman, et al
Affiliation: LASP, University of Colorado
The highly variable solar extreme ultraviolet (EUV) radiation is the major energy input into the Earth’s upper atmosphere and thus impacts the geospace environment that affects satellite operations and communications. The Extreme ultraviolet Variability Experiment (EVE) aboard the NASA Solar Dynamics Observatory (SDO) will measure the solar EUV irradiance from 0.1 to 105 nm with unprecedented spectral resolution (0.1 nm), temporal cadence (10 sec), and accuracy (20%). The EVE program will provide solar EUV irradiance data for the Living With the Star (LWS) program, including near real-time data products to be used in operational atmospheric models that specify the space environment and to assist in forecasting for space weather operations. The EVE program is expected to make significant progress towards real understanding of the physics of the solar EUV irradiance variations on time scales from flares to the solar cycle. This progress, which includes providing better predictions, will be made through utilizing simultaneous measurements of the solar EUV irradiance and full Sun images of magnetic fields and brightness at wavelengths emitted from the chromosphere, transition region, and corona, which are made by other SDO instruments.