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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 25, issue 7
Ann. Geophys., 25, 1555–1568, 2007
https://doi.org/10.5194/angeo-25-1555-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 25, 1555–1568, 2007
https://doi.org/10.5194/angeo-25-1555-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Jul 2007

30 Jul 2007

Morphology in the total electron content under geomagnetic disturbed conditions: results from global ionosphere maps

Zhao Biqiang1, Wan Weixing1, Liu Libo1, and Mao Tian1,2,3 Zhao Biqiang et al.
  • 1Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
  • 2Wuhan Institute of Physics and Mathematics, CAS, Wuhan 430071, China
  • 3Graduate School of Chinese Academy of Sciences, Beijing, China

Abstract. Using 8-year global ionosphere maps (GIMs) of TEC products from the Jet Propulsion Laboratory (JPL), we make a statistical study on the morphology of the global ionospheric behaviors with respect to the geomagnetic disturbances. Results show that the behaviors of TEC during geomagnetic storm present clear seasonal and local time variations under geomagnetic control in a similar way as those of NmF2 (Field and Rishbeth, 1997). A negative phase of TEC occurs with high probability in the summer hemisphere and most prominent near the geomagnetic poles, while a positive phase is obvious in the winter hemisphere and in the far pole region. A negative storm effect toward lower latitudes tends to occur from post-midnight to the morning sector and recedes to high latitude in the afternoon. A positive storm effect is separated by geomagnetic latitudes and magnetic local time. Furthermore, ionospheric responses at different local time sectors with respect to the storm commencement shows very different developing processes corresponding to the evolution of the geomagnetic storm. A daytime positive storm effect is shown to be more prominent in the American region than those in the Asian and European regions, which may suggest a longitudinal effect of the ionospheric storm.

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