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      • Department of Electrical and Electronics Engineering
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      Association of ionospheric storms and substorms of global electron content with proxy AE index

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      Author(s)
      Yenen, S. D.
      Gulyaeva, T. L.
      Arikan, F.
      Arıkan, Orhan
      Date
      2015
      Source Title
      Advances in Space Research
      Print ISSN
      0273-1177
      Publisher
      Pergamon Press
      Volume
      56
      Issue
      7
      Pages
      1343 - 1353
      Language
      English
      Type
      Article
      Item Usage Stats
      225
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      207
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      Abstract
      Storm time modeling of Global Electron Content (GEC) calculated from GIM-TEC for 1999-2013 is associated with new proxy of Auroral Electrojet variability expressed as a smoothed and normalized Auroral Electrojet index (AEsn). The variability in GEC is captured by the computation of DGEC which is obtained by taking the hourly ratio of instant GEC to median of GEC values at the same hour of 7 preceding days. The storm onset is determined by a joint analysis of variations in IMF-B magnitude, its derivative (dB/dt) and direction of IMF-Bz together with sudden increase in AE exceeding 900 nT. The start of the pre-storm period is chosen to be 7 h prior to the storm onset time and the storm recovery period ends 41 h after the storm onset. The hourly AEsn is related to DGEC during the storm period through a polynomial whose coefficients are estimated in the linear least squares sense. Estimated coefficients are examined and grouped with respect to different kinds of auroral storms. Examples of modeling methodology are provided using four different kinds of intense storms and substorms, namely, Positive Arctic, Positive Antarctic, Negative Arctic and Negative Antarctic that occurred between 1999 and 2013. The estimated coefficients for storm periods are compared with those of non-storm periods. It is observed that the positive correlation between the increase of AE and GEC can be a promising precursor of space weather variability.
      Keywords
      Auroral Electrojet (AE) index
      Global Electron Content (GEC)
      Space weather
      Atmospheric electricity
      Electrons
      Geomagnetism
      Ionosphere
      Auroral electrojet indices
      Geomagnetic storm
      Total electron content
      Storms
      Permalink
      http://hdl.handle.net/11693/23203
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.asr.2015.06.025
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      • Department of Electrical and Electronics Engineering 4011
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