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Solar Irradiance: Instrument-Based Advances

Published online by Cambridge University Press:  03 March 2020

Greg Kopp*
Affiliation:
University of Colorado / Laboratory for Atmospheric & Space Physics Boulder, CO 80303 U.S.A. email: Greg.Kopp@LASP.Colorado.edu
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Abstract

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Variations of the total solar irradiance (TSI) over long periods of time provide natural Earth-climate forcing and are thus important to monitor. Variations over a solar cycle are at the 0.1 % level. Variations on multi-decadal to century timescales are (fortunately for our climate stability) very small, which drives the need for highly-accurate and stable measurements over correspondingly long periods of time to discern any such irradiance changes. Advances to TSI-measuring space-borne instruments are approaching the desired climate-driven measurement accuracies and on-orbit stabilities. I present a summary of the modern-instrument improvements enabling these measurements and present some of the solar-variability measurement results from recent space-borne instruments, including TSI variations on timescales from solar flares and large-scale convection to solar cycles.

Type
Contributed Papers
Copyright
© International Astronomical Union 2020

References

Kopp, G. & Lean, J.L. 2011, Geophys. Res. Letters, 38, L01706, doi:10.1029/2010GL045777 Google Scholar
Kopp, G. 2014, J. Sp. Weather & Sp. Climate, 4, A14, doi:10.1051/swsc/2014012 Google Scholar
Kopp, G. 2016, J. Sp. Weather & Sp. Climate, 6, A30, doi:10.1051/swsc/2016025 CrossRefGoogle Scholar
Lean, J.L. 2017, Oxford Res. Encycl. Climate Sci., doi:10.1093/acrefore/9780190228620.013.9 Google Scholar
Woods, T.N., Kopp, G., & Chamberlin, P.C. 2006, J. Geophys. Res., 111, A10S14, doi:10.1029/2005JA011507 CrossRefGoogle Scholar
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