Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1112s&link_type=abstract
American Astronomical Society, SPD meeting #40, #11.12; Bulletin of the American Astronomical Society, Vol. 41, p.827
Astronomy and Astrophysics
Astronomy
Scientific paper
The SOLar-STellar Irradiance Comparison Experiments (SOLSTICEs) on the Upper Atmosphere Research Satellite (UARS) and the Solar Radiation and Climate Experiment (SORCE) have been making daily measurements of the solar spectral irradiance (SSI) in the ultraviolet since 1991. This time period includes both the Whole Solar Month (WSM) in August 1996 with UARS observations and the Whole Heliosphere Interval (WHI) in April 2008 with SORCE measurements. Understanding instrument degradation and cross-calibrations between the two instruments are crucial for comparing these two data sets. This comparison between SORCE and UARS for the two quiet sun epochs indicates that the current solar cycle minimum is lower in the ultraviolet than the previous minimum observed by UARS. There is more confidence in this result for the far ultraviolet (120-200 nm) because the uncertainty in the instrument response is a smaller fraction of the solar variability than for the middle ultraviolet (200-300 nm).
McClintock William E.
Snow Martin
Woods Thomas N.
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