HR: 15:10h
AN: SA33A-07    [Abstracts]
TI: Contributions of the Solar Ultraviolet Irradiance to the Total Solar Irradiance During Large Flares
AU: * Woods, T N
EM: tom.woods@lasp.colorado.edu
AF: LASP / University of Colorado, 1234 Innovation Dr., Boulder, CO 80303 United States
AU: Kopp, G
EM: greg.kopp@lasp.colorado.edu
AF: LASP / University of Colorado, 1234 Innovation Dr., Boulder, CO 80303 United States
AB: The TIMED satellite was launched in December 2001 and the SORCE satellite was launched in January 2003. Since then the solar activity has evolved from solar maximum conditions to moderately low activity in 2005. The XUV Photometer System (XPS), aboard both TIMED and SORCE, is measuring the solar soft X-ray (XUV) irradiance shortward of 34 nm with 7-10 nm spectral resolution and the bright hydrogen emission at 121.5 nm. The XPS instrument is best known for observing over 200 flares during the TIMED mission with its 3% solar observing duty cycle and over 800 flares during the SORCE mission with its 70% duty cycle. The XUV radiation, being mostly from coronal emissions, varies more than other wavelengths in the solar spectrum during a flare event, with each flare lasting from minutes to hours. The XPS measurements indicate variations by a factor of 50 for the largest flares during the October-November 2003 solar storm period and that the XUV variations can be as much as 20% of the total flare energy as determined from the total solar irradiance (TSI) measurements by the SORCE Total Irradiance Monitor (TIM). The flare variations of the solar XUV irradiance and TSI will be discussed in the context of the TIMED and SORCE missions and their relationship to the GOES X-ray flare measurements.
DE: 0358 Thermosphere: energy deposition (3369)
DE: 2479 Solar radiation and cosmic ray effects
DE: 7519 Flares
DE: 7538 Solar irradiance
SC: SPA-Aeronomy [SA]
MN: Fall Meeting 2005