Solar EUV/FUV irradiance variations: analysis and observational strategy |
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| Authors: | Matthieu Kretzschmar Thierry Dudok de Wit Jean Lilensten Jean-Francois Hochedez Jean Aboudarham Pierre-Olivier Amblard Frederic Auchère Said Moussaoui |
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| Institution: | 1.LPCE/CNRS,Orléans,France;2.SIDC, Royal Observatory of Belgium,Brussels,Belgium;3.LPG/CNRS, Batiment D de Physique,Saint-Martin d’Hères,France;4.LESIA, Observatoire de Paris,Meudon,France;5.GIPSA-lab/Dept. Images and Signals- CNRS UMR5216,Grenoble,France;6.IAS, Université Paris-Sud,Orsay,France;7.IRCCYN,Nantes,France |
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| Abstract: | The knowledge of solar extreme and far ultraviolet (EUV) irradiance variations is essential for the characterization of the
Earth’s upper atmosphere. For a long time, this knowledge has been based on empirical models, which are themselves based on
proxies of the solar activity. However, the accurate modeling and prediction of the Earth’s upper atmosphere necessitate to
improve the precision on the irradiance and its variations below about 200 nm. Here, we present a review of recent works made
by the authors that aim at quantifying the irradiance variability at these wavelengths, and that lead to new way of monitoring
the solar EUV/FUV irradiance spectrum. In more details, it is shown that the quantification of the high level of redundancy
in the solar spectrum variability allows to envisage measuring only a small portion of the spectrum without losing essential
knowledge. Finally, we discuss what should and could be measured in order to retrieve the solar extreme and far ultraviolet
spectrum. |
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