Review on the solar spectral variability in the EUV for space weather purposes

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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.




Lilensten, J., Dudok De Wit, T., Kretzschmar, M., Amblard, P. O., Moussaoui, S., Aboudarham, J., & Auchre, F. (2008). Review on the solar spectral variability in the EUV for space weather purposes. Annales Geophysicae, 26(2), 269–279.

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