Which solar EUV indices are best for reconstructing the solar EUV irradiance? |
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| Authors: | T Dudok de Wit M Kretzschmar J Aboudarham P-O Amblard F Auchère J Lilensten |
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| Institution: | 1. LPCE, CNRS and University of Orléans, 3A avenue de la Recherche Scientifique, 45071 Orléans, France;2. SIDC, Royal Observatory of Belgium, Ringlaan 3, 1180 Brussel, Belgium;3. LESIA, Paris Observatory, 5 Place Jules Janssen, 92195 Meudon, France;4. GIPSAlab, CNRS, 961 Rue de la Houille Blanche, BP 46, 38402 Saint-Martin d’Hères, France;5. IAS, CNRS and University of Paris-Sud, Bâtiment 121, 91405 Orsay, France;6. LPG, CNRS and Joseph Fourier University, Bâtiment D de Physique, BP 53, 38041 Saint-Martin d’Hères, France |
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| Abstract: | The solar EUV irradiance is of key importance for space weather. Most of the time, however, surrogate quantities such as EUV indices have to be used by lack of continuous and spectrally resolved measurements of the irradiance. The ability of such proxies to reproduce the irradiance from different solar atmospheric layers is usually investigated by comparing patterns of temporal correlations. We consider instead a statistical approach. The TIMED/SEE experiment, which has been continuously operating since February 2002, allows for the first time to compare in a statistical manner the EUV spectral irradiance to five EUV proxies: the sunspot number, the f10.7, Ca K, and Mg II indices, and the He I equivalent width. |
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| Keywords: | Solar EUV irradiance Solar EUV proxies Solar EUV indices Multivariate statistics |
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