Solar Cycle Variation of the Solar Ultraviolet Irradiance: Recent Observations from SORCE and TIMED

Details Solar Cycle Variation of the Solar Ultraviolet Irradiance: Recent Observations from SORCE and TIMED Solar Cycle Variation of the Solar Ultraviolet Irradiance: Recent Observations from SORCE and TIMED

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa23a..03w&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA23A-03

Physics

0358 Thermosphere: Energy Deposition (3369), 7536 Solar Activity Cycle (2162), 7538 Solar Irradiance, 7549 Ultraviolet Emissions

Scientific paper

The solar cycle has evolved from solar maximum conditions in 2000-2002 to near minimum conditions in 2006. Some of the latest results on solar cycle variations are from the Thermosphere, Ionosphere, Mesosphere, Energetics, and Dynamics (TIMED) satellite that was launched in December 2001 and the Solar Radiation and Climate Experiment (SORCE) satellite that was launched in January 2003. The solar irradiance instruments aboard TIMED and SORCE are providing daily and higher cadence measurements of the solar spectral irradiance from 0.1 nm to 2700 nm. The solar ultraviolet irradiance shortward of 300 nm is completely absorbed in Earth's atmosphere and affects the photochemistry, energetics, and dynamics of our atmosphere. The solar cycle variations of the ultraviolet irradiance have a complex relationship with wavelength, but can generally be characterized by the variations from the different layers in the solar atmosphere. The coronal emissions, such as the Fe XVI 33.5 nm emission and X-rays, vary during the solar cycle by a factor of about 8 or more. The transition region emissions, such as the He II 30.4 nm emission, vary less by a factor of about 2. The chromospheric emissions, such as the O I 130.4 nm emission, varies by 50% or less. The variations of the solar UV irradiance shortward of 300 nm will be discussed in the context of the solar cycle since 2002.

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