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Latitudinal and Seasonal Investigations of Storm-Time TEC Variation

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Abstract

The ionosphere responds markedly and unpredictably to varying magnetospheric energy inputs caused by solar disturbances on the geospace. Knowledge of the impact of the space weather events on the ionosphere is important to assess the environmental effect on the operations of ground- and space-based technologies. Thus, global positioning system (GPS) measurements from the international GNSS service (IGS) database were used to investigate the ionospheric response to 56 geomagnetic storm events at six different latitudes comprising the northern and southern hemispheres in the Afro-European sector. Statistical distributions of total electron content (TEC) response show that during the main phase of the storms, enhancement of TEC is more pronounced in most of the seasons, regardless of the latitude and hemisphere. However, a strong seasonal dependence appears in the TEC response during the recovery phase. Depletion of TEC is majorly observed at the high latitude stations, and its appearance at lower latitudes is seasonally dependent. In summer hemisphere, the depletion of TEC is more pronounced in nearly all the latitudinal bands. In winter hemisphere, enhancement as well as depletion of TEC is observed over the high latitude, while enhancement is majorly observed over the mid and low latitudes. In equinoxes, the storm-time TEC distribution shows a fairly consistent characteristic with the summer distribution, particularly in the northern hemisphere.

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Acknowledgments

The Authors are grateful to the management team of National Space Science Data Center (http://nssdcgsfc.nasa.gov/omniweb), for the IMF-Bz and geomagnetic index data, as well as the Scripps Orbit and Permanent Array Center (SOPAC) (ftp://garner.ucsd.edu) and IGS for making GPS data available for research use.

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Authors and Affiliations

  1. Department of Physics, University of Ilorin, P.M.B. 1515, Ilorin, Kwara, Nigeria

    I. A. Adimula & O. A. Oladipo

  2. Department of Physics, Landmark University, P.M.B. 1001, Omu-Aran, Kwara, Nigeria

    S. J. Adebiyi

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  1. I. A. Adimula
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  2. O. A. Oladipo
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  3. S. J. Adebiyi
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Correspondence to S. J. Adebiyi.

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Adimula, I.A., Oladipo, O.A. & Adebiyi, S.J. Latitudinal and Seasonal Investigations of Storm-Time TEC Variation. Pure Appl. Geophys. 173, 2521–2533 (2016). https://doi.org/10.1007/s00024-016-1291-2

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  • DOI: https://doi.org/10.1007/s00024-016-1291-2

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