# Impact of magnetic storms on the global TEC distribution

The study is focused on the analysis of total electron content (TEC) variations during six geomagnetic storms of different intensity: from inline-formula $M1inlinescrollmathml{\mathrm{normal Dst}}_{\mathrm{normal min}}=-normal 46$ 64pt12ptsvg-formulamathimge4cf4d3bef8917005c106a5abe233acf angeo-36-1057-2018-ie00001.svg64pt12ptangeo-36-1057-2018-ie00001.png inline-formulanT to inline-formula $M3inlinescrollmathml{\mathrm{normal Dst}}_{\mathrm{normal min}}=-normal 223$ 70pt12ptsvg-formulamathimgb32106faf42056fb1618620dbbc72ef1 angeo-36-1057-2018-ie00002.svg70pt12ptangeo-36-1057-2018-ie00002.png inline-formulanT. The values of TEC deviations from its 27-day median value (inline-formulaδTEC) 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 inline-formulaδTEC 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 inline-formulaδTEC 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 inline-formulaδTEC 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 (inline-formulaR) between inline-formulaδTEC values along the three meridians was analyzed for each storm. In general, inline-formulaR>0.5 between inline-formulaδTEC values averaged along each meridian. This result is new. The possible reasons for the exceptions (when inline-formulaR<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 inline-formulaR on the intensity of magnetic disturbance, in general inline-formulaR decreased with the growth of storm intensity.

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Blagoveshchensky, Donat V. / Maltseva, Olga A. / Sergeeva, Maria A.: Impact of magnetic storms on the global TEC distribution. 2018. Copernicus Publications.

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