Impact of magnetic storms on the global TEC distribution
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Published:2018-08-02
Issue:4
Volume:36
Page:1057-1071
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ISSN:1432-0576
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Container-title:Annales Geophysicae
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language:en
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Short-container-title:Ann. Geophys.
Author:
Blagoveshchensky Donat V.,Maltseva Olga A.,Sergeeva Maria A.
Abstract
Abstract. The study is focused on the analysis of total electron content (TEC)
variations during six geomagnetic storms of different intensity: from
Dstmin=-46 nT to Dstmin=-223 nT. The values of TEC deviations from its 27-day median value
(δTEC) were calculated during the periods of the storms along three
meridians: American, Euro-African and Asian-Australian. The following results
were obtained. For the majority of the storms almost simultaneous occurrence
of δTEC maximums was observed along all three meridians at the
beginning of the storm. The transition from a weak storm to a superstorm (the
increase of magnetic activity) almost does not affect the intensity of the
δTEC maximum. The seasonal effect was most pronounced along the
Asian-Australian meridian, less often along the Euro-African meridian and was
not revealed along the American meridian. Sometimes the seasonal effect can
penetrate to the opposite hemisphere. The character of average δTEC
variations for the intense storms was confirmed by GOES satellite data.
Though there are some common features of TEC variation revealed during each
storm phase, in general no clear dependence of TEC responses on the storm
phases was found: the effects were different during each storm at different
locations. The behavior of the correlation coefficient (R) between δTEC values along the three meridians was analyzed for each storm. In
general, R>0.5 between δTEC values averaged along each meridian.
This result is new. The possible reasons for the exceptions (when R<0.5)
were provided: the complexity of phenomena during the intense storms and
discordance in local time of the geomagnetic storm beginning along different
meridians. Notwithstanding the complex dependence of R on the intensity of
magnetic disturbance, in general R decreased with the growth of storm
intensity.
Publisher
Copernicus GmbH
Subject
Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Atmospheric Science,Geology,Astronomy and Astrophysics
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