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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 32, issue 2
Ann. Geophys., 32, 121-131, 2014
https://doi.org/10.5194/angeo-32-121-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 32, 121-131, 2014
https://doi.org/10.5194/angeo-32-121-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 18 Feb 2014

Regular paper | 18 Feb 2014

Quasi-16-day periodic meridional movement of the equatorial ionization anomaly

X. H. Mo2,1, D. H. Zhang1, L. P. Goncharenko3, Y. Q. Hao1, and Z. Xiao1 X. H. Mo et al.
  • 1Department of Geophysics, Peking University, Beijing, 100871, China
  • 2College of Physics and Electronic Engineering, Guangxi University for Nationalities, Nanning, China
  • 3Haystack Observatory, Massachusetts Institute of Technology, Westford, Massachusetts, USA

Abstract. Based on the daytime location of the equatorial ionization anomaly (EIA) crest derived from GPS observations at low latitude over China during the 2005–2006 stratospheric sudden warming (SSW), a quasi-16-day periodic meridional movement of EIA crest with the maximum amplitude of about 2 degrees relative to the average location of EIA crest has been revealed. In addition, periodic variations that are in phase with the meridional EIA movement are also revealed in the equatorial electrojet (EEJ) and F2 layer peak height (hmF2) over Chinese ionosonde stations Haikou and Chongqing. The quasi-16-day periodic component in Dst index is weak, and the 16-day periodic component does not exist in F10.7 index. Such large-scale periodic meridional movement of EIA crest is likely related to the globally enhanced stratospheric planetary waves coupled with anomalous stratospheric zonal wind connected with SSW. In addition, such large-scale periodic movement of EIA should be global, and can affect the ionospheric morphology around the low-latitude belt near the EIA region. Further case analysis, simulation and theoretical studies must proceed in order to understand the periodic movements of EIA connected with the different periodic atmospheric variations.

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