Todays knowledge of the solar EUV output and the future needs for more accurate measurements for aeronomy |
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| Authors: | Gerhard Schmidtke |
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| Institution: | Institut für physikalische Weltraumforschung, Fraunhofer-Gesellschaft, Heidenhofstraße 8, D-7800 Freiburg, Germany |
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| Abstract: | In recent years discrepancies arose in the determination of the solar EUV output. It is difficult and often impossible to remove these discrepancies from the observational data reported so far. However, the EUV data show evidence for a strong variability during the Solar Cycle 20. The measuring methods applied so far create uncertainties of the order of ± 30% or less. Therefore, new methods have to be developed for more accurate measurements. Two approaches offer the possibility of overcoming todays shortcomings. With these methods the EUV indices will be measured with an accuracy better than 10%, using a simple spectrometer on a free-flying long-term mission with recalibration factors provided by short-term mission results e.g. from Soyuz or Spacelab. |
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