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Solar Spectral Irradiance Variability in November/December 2012: Comparison of Observations by Instruments on the International Space Station and Models |
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| Authors: | G Thuillier G Schmidtke C Erhardt B Nikutowski A I Shapiro C Bolduc J Lean N Krivova P Charbonneau G Cessateur M Haberreiter S Melo V Delouille B Mampaey K L Yeo W Schmutz |
| Institution: | 1. LATMOS-CNRS, 11 Blvd d’Alembert, 78280, Guyancourt, France 2. Fraunhofer Institute for Physical Measurement Techniques, Heidenhofstrasse 8, 79110, Freiburg, Germany 3. Institute for Meteorology, University of Leipzig, Stephanstr. 3, 04103, Leipzig, Germany 4. Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center, 7260, Davos Dorf, Switzerland 5. Département de Physique, Université de Montréal, C.P. 6128, Montréal, QC, H2C 3J7, Canada 6. Space Science Division, Naval Research Laboratory, 4555 Overlook Ave. SW, Washington, DC, 20375, USA 7. Max-Planck-Institute für Sonnensystemforschung, G?ttigen, Germany 8. Department of Physics, University of Toronto, 50 George St, Toronto, Ontario, Canada 10. Royal Observatory of Belgium, Brussels, Belgium 9. Solar-Terrestrial Centre of Excellence, Brussels, Belgium |
| Abstract: | Onboard the International Space Station (ISS), two instruments are observing the solar spectral irradiance (SSI) at wavelengths from 16 to 2900 nm. Although the ISS platform orientation generally precludes pointing at the Sun more than 10?–?14 days per month, in November/December 2012 a continuous period of measurements was obtained by implementing an ISS ‘bridging’ maneuver. This enabled observations to be made of the solar spectral irradiance (SSI) during a complete solar rotation. We present these measurements, which quantify the impact of active regions on SSI, and compare them with data simultaneously gathered from other platforms, and with models of spectral irradiance variability. Our analysis demonstrates that the instruments onboard the ISS have the capability to measure SSI variations consistent with other instruments in space. A comparison among all available SSI measurements during November–December 2012 in absolute units with reconstructions using solar proxies and observed solar activity features is presented and discussed in terms of accuracy. |
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