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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 26, issue 1
Ann. Geophys., 26, 107-116, 2008
https://doi.org/10.5194/angeo-26-107-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 26, 107-116, 2008
https://doi.org/10.5194/angeo-26-107-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  04 Feb 2008

04 Feb 2008

The ionospheric responses to the 11 August 1999 solar eclipse: observations and modeling

H. Le1,2, L. Liu1, X. Yue1,2, and W. Wan1 H. Le et al.
  • 1Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
  • 2Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

Abstract. A total eclipse occurred on 11 August 1999 with its path of totality passing over central Europe in the latitude range 40°–50° N. The ionospheric responses to this eclipse were measured by a wide ionosonde network. On the basis of the measurements of foE, foF1, and foF2 at sixteen ionosonde stations in Europe, we statistically analyze the variations of these parameters with a function of eclipse magnitude. To model the eclipse effects more accurately, a revised eclipse factor, FR, is constructed to describe the variations of solar radiation during the solar eclipse. Then we simulate the effect of this eclipse on the ionosphere with a mid- and low-latitude ionosphere theoretical model by using the revised eclipse factor during this eclipse. Simulations are highly consistent with the observations for the response in the E-region and F1-region. Both of them show that the maximum response of the mid-latitude ionosphere to the eclipse is found in the F1-region. Except the obvious ionospheric response at low altitudes below 500 km, calculations show that there is also a small response at high altitudes up to about 2000 km. In addition, calculations show that when the eclipse takes place in the Northern Hemisphere, a small ionospheric disturbance also appeared in the conjugate hemisphere.

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