Comparisons of FUV Solar Irradiance Measurements by SORCE, TIMED-SEE, and UARS


Authors F.G. Eparvier (1), T.N. Woods (1), G.J. Rottman (1), L.E. Floyd (2),

W.E. McClintock (1), and M. Snow (1)

Affiliations: 1) University of Colorado, LASP

2) Interferometrics, Inc. & NRL


Currently there are three satellites with sets of instruments measuring the solar FUV spectral irradiance (120 200 nm). The Solar EUV Experiment (SEE) on board the TIMED satellite has been measuring both the solar EUV and FUV daily since early 2002. The Upper Atmosphere Research Satellite (UARS), launched in 1991, continues to measure the FUV with two instruments: the Solar Stellar Irradiance Comparison Experiment (SOLSTICE) and the Solar Ultraviolet Spectral Irradiance Monitor (SUSIM). The Solar Radiation Climate Experiment (SORCE) mission was recently launched in early 2003 carrying two SOLSTICE instruments which measure the solar FUV. This paper will present the TIMED-SEE FUV measurements from early 2002 to the present and compare them with historical and simultaneous measurements from the UARS and SORCE FUV instruments, providing an overview of solar FUV variability on time scales from days to a full solar cycle.