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Ann. Geophys., 26, 269-279, 2008
www.ann-geophys.net/26/269/2008/
© European Geosciences Union 2008
Review on the solar spectral variability in the EUV for space weather purposes
J. Lilensten1, T. Dudok de Wit2, M. Kretzschmar3, P.-O. Amblard4, S. Moussaoui5, J. Aboudarham6, and F. Auchère7
1LPG, CNRS and Joseph Fourier University, Bâtiment D de Physique, BP 53, 38041 Saint-Martin d'Hères cedex 9, France
2LPCE, CNRS and University of Orléans, 3A avenue de la Recherche Scientifique, 45071 Orléans cedex 2, France
3SIDC, Royal Observattory of Belgium, avenue circulaire 3, 1180 Brussels, Belgium
4GIPSAlab, CNRS, 961 Rue de la Houille Blanche, BP 46, 38402 St. Martin d'Hères cedex, France
5IRCCYN, 1, rue de la Noë, BP 92101, 44321 NANTES Cedex 3, France
6LESIA, Paris Observatory, 5 Place Jules Janssen, 92195 Meudon, France
7IAS, CNRS and Paris-Sud University, Bâtiment 121, 92405 Orsay cedex, France
Abstract. The solar XUV-EUV flux is the main energy source in the terrestrial diurnal
thermosphere: it produces ionization, dissociation, excitation and heating.
Accurate knowledge of this flux is of prime importance for space weather. We
first list the space weather applications that require nowcasting and
forecasting of the solar XUV-EUV flux. We then review present models and
discuss how they account for the variability of the solar spectrum. We show
why the measurement of the full spectrum is difficult, and why it is illusory
to retrieve it from its atmospheric effects. We then address the problem of
determining a set of observations that are adapted for space weather
purposes, in the frame of ionospheric studies. Finally, we review the
existing and future space experiments that are devoted to the observation of
the solar XUV-EUV spectrum.
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