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Solar variability measured by GOME and SCIAMACHY in the UV/visible/NIR spectral range (1995-present)

Mark Weber(1), Jochen Skupin(1), Stefan Noel(1), Joseph Pagaran(1) and John Burrows(1)

(1) University of Bremen FB1, PO Box 330 440, D-28334 Bremen, Germany

Abstract

GOME (Global Ozone Monitoring Experiment, 1995-present) and SCIAMACHY (SCanning Imaging Absorption Spectrometer for Atmospheric CHartographY, 2002-present) measure daily solar spectral irradiances in the visible and near UV at moderateley high spectral resolution (0.2-0.4 nm) since 1995. SCIAMACHY that was launched in 2002 extends the coverage to the near IR with some gaps up to 2380 nm. The irradiance measured by SCIAMACHY is compared with results from other data sources such as SIM, SOLSPEC, SOLSTICE, and SUSIM and is generally in good agreement within 2 to 3% in most cases. The Mg II index is derived from daily solar observations in the near UV spectral region which provides a good measure of the solar EUV variability. In this presentation we are focusing more on the derivation of suitable solar variability proxies in the visible that are more representative of total solar irradiance variations. The largest contribution to TSI ("solar constant") comes from the optical range beyond 400 nm. A few examples are given how solar variability is linked to atmospheric variability, in particular, ozone and temperature.

 

Workshop presentation

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry