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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 34, issue 12
Ann. Geophys., 34, 1109–1117, 2016
https://doi.org/10.5194/angeo-34-1109-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: The 14th International Symposium on Equatorial Aeronomy

Ann. Geophys., 34, 1109–1117, 2016
https://doi.org/10.5194/angeo-34-1109-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 29 Nov 2016

Regular paper | 29 Nov 2016

Spatial and temporal variation of total electron content as revealed by principal component analysis

Elsayed R. Talaat and Xun Zhu

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Latest update: 25 May 2020
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Short summary
Global total electron content data derived from the assimilated thermosphere–ionosphere model are analyzed using empirical orthogonal function (EOF) decomposition and the principal component analysis technique. The spectral analysis of the time series of the EOF coefficients reveals how different mechanisms such as solar flux variation, change in the orbital declination, nonlinear mode coupling and geomagnetic activity are separated and expressed in different EOFs.
Global total electron content data derived from the assimilated thermosphere–ionosphere model...
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