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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 29, issue 6
Ann. Geophys., 29, 1063-1070, 2011
https://doi.org/10.5194/angeo-29-1063-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 29, 1063-1070, 2011
https://doi.org/10.5194/angeo-29-1063-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

  17 Jun 2011

17 Jun 2011

Longitudinal study of the ionospheric response to the geomagnetic storm of 15 May 2005 and manifestation of TADs

S. Sharma1, P. Galav1, N. Dashora2, and R. Pandey1 S. Sharma et al.
  • 1Department of Physics, M. L. S. University, Udaipur 313 001, India
  • 2National Atmospheric Research Laboratory, Gadanki 517 512, India

Abstract. Response of low latitude ionosphere to the geomagnetic storm of 15 May 2005 has been studied using total electron content (TEC) data, obtained from three GPS stations namely, Yibal, Udaipur and Kunming situated near the northern crest of equatorial ionization anomaly at different longitudes. Solar wind parameters, north-south component of the interplanetary magnetic field (IMF Bz) and AE index data have been used to infer the strength of the geomagnetic storm. A large value of eastward interplanetary electric field at 06:15 UT, during the time of maximum southward IMF Bz has been used to infer the transmission of an eastward prompt penetration electric field (PPEF) which resulted in a peak in TEC at 07:45 UT due to the local uplift of plasma in the low latitudes near the anomaly crest over a wide range of longitudes. Wave-like modulations superposed over the second enhancement in TEC between 09:15 UT to 10:30 UT have been observed at all the three stations. The second enhancement in TEC along with the modulations of up to 5 TECU have been attributed to the combined effect of super plasma fountain and traveling atmospheric disturbances (TAD). Observed large enhancements in TEC are a cause of concern for satellite based navigation and ground positioning. Increased [O/N2] ratio between 09:15 UT to 10:15 UT when modulations in TEC have been also observed, confirms the presence of TADs over a wide range of longitudes.

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