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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 32, issue 10
Ann. Geophys., 32, 1305–1309, 2014
https://doi.org/10.5194/angeo-32-1305-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 32, 1305–1309, 2014
https://doi.org/10.5194/angeo-32-1305-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 28 Oct 2014

Regular paper | 28 Oct 2014

Satellite-based analysis of thermosphere response to extreme solar flares

S. Krauss, M. Pfleger, and H. Lammer S. Krauss et al.
  • Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, 8042 Graz, Austria

Abstract. We present a refined algorithm to calculate pseudo solar indices, which enable the reproduction of a solar flare impact on the upper Earth's atmosphere for the empirical thermosphere model Jacchia-Bowman 2008. In a first step we compare the estimates of the new algorithm with those from a previous study by analysing an extreme X17.2 flare in 2003 using TIMED/SEE EUV observations. In a second step we adapt the method to use SOHO/SEM measurements within the algorithm and compare the findings with the previous results. Furthermore, the latter procedure is validated by means of GRACE density measurements during a X2.0 solar flare in November 2004. In each of the cases also a comparison with theoretical thermosphere models is performed, which shows a good agreement and suggests that the algorithm can support theoretical evolution studies in case no in situ density measurements during extreme solar events are available.

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