Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa31a..02w&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SA31A-02
Physics
0358 Thermosphere: Energy Deposition, 2479 Solar Radiation And Cosmic Ray Effects, 5435 Ionospheres (2459), 7538 Solar Irradiance, 7549 Ultraviolet Emissions
Scientific paper
The recent measurements of the solar ultraviolet (UV) irradiance from the NASA Thermosphere-Ionosphere-Mesosphere-Energetics-Dynamics (TIMED) mission and the NASA SOlar Radiation and Climate Experiment (SORCE) mission will be presented. The solar far ultraviolet (FUV: 120-200 nm) irradiance is being measured by the SORCE SOLar STellar Irradiance Comparison Experiment (SOLSTICE) with 0.1 nm spectral resolution and 5% accuracy. The solar extreme ultraviolet (EUV: 30-120 nm) irradiance is being measured by the TIMED Solar EUV Experiment (SEE) with 0.4 nm spectral resolution and 15% accuracy. The solar soft x-ray (XUV: 0.1-30 nm) irradiance is being measured by the XUV Photometer System (XPS), which is aboard both the TIMED and SORCE satellites, with 10 nm resolution and 20% accuracy. The TIMED satellite was launched in December 2001 near solar cycle maximum, and the SORCE satellite was launched in January 2003 during moderate solar cycle activity. The solar activity has now declined to low-moderate activity. The solar UV irradiance varies on all time scales, seconds to years, and this variation is very dependent on wavelength. In addition to the new results on the solar variations related to the 11-year solar cycle and the 27-day solar rotation, the TIMED and SORCE solar instruments have observed several hundred flares concentrated primarily during the solar storm periods in June 2003, October 2003, July 2004, November 2004, and January 2005. The coronal emissions, such as the Fe XVI 33.5 nm emission and x-rays, vary the most, with variations of a factor of 30 for the large flares, a factor of 2 for solar rotation, and a factor of 5 during the TIMED mission (3 years). The transition region emissions, such as the H I 121.6 nm and He II 30.4 nm emissions, vary less with variations of a factor of 1.5 for the large flares, a factor of 1.2 for solar rotation, and a factor of 1.6 during the TIMED mission. The chromospheric and photospheric emissions vary even less. The variations of the solar UV irradiance shortward of 190 nm will be discussed in the context of planetary atmospheric research.
Eparvier Francis G.
McClintock William
Woods Thomas N.
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