Journal cover Journal topic
Annales Geophysicae Sun, Earth, planets, and planetary systems An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/angeo-2018-4
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Regular paper
16 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).
Impact of magnetic storms on the global TEC distribution
Donat V. Blagoveshchensky1, Olga A. Maltseva2, and Maria A. Sergeeva3,4 1Saint-Petersburg State University of Aerospace Instrumentation, 67, Bolshaya Morskaya, Saint-Petersburg, 190000, Russia
2Institute for Physics, Southern Federal University, Stachki, 194, Rostov-on-Don, 344090, Russia
3SCiESMEX, LANCE, Instituto de Geofisica, Unidad Michoacan, Universidad Nacional Autonoma de Mexico, Morelia, 58089, Mexico
4CONACYT, Instituto de Geofisica, Unidad Michoacan, Universidad Nacional Autonoma de Mexico, Morelia, 58089, Mexico
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 the Asian-Australian and Euro-African meridians at the beginning of the storm. The transition from weak storm to superstorm (the increase of magnetic activity) almost does not affect the intensity of δTEC maximum. The effect revealed for the American sector during two storms was the movement of the disturbance front from Northern and Southern high latitudes towards the equator with the average velocity of ~ 400 m/s. The seasonal effect was most pronounced at Asian-Australian meridian, less often at Euro-African meridian and was not revealed at American meridian. Sometimes the seasonal effect can penetrate to the opposite hemisphere. The character of averaged δTEC variations for the intense storms was confirmed by GOES satellite data. The behaviour of correlation coefficient (R) between δTEC at three meridians was analyzed for each storm. In general, R > 0.5 between δTEC averaged along each meridian. This result is new. The possible reasons for the exceptions (when R < 0.5) were provided: time-shift of δTEC maximum at different latitudes along the American meridian, the complexity of phenomena during the intense storms and discordance in local time of geomagnetic storm beginning at different meridians. Notwithstanding the complex dependence of R on the intensity of magnetic disturbance, in general R decreased with the growth of storm intensity.

Citation: Blagoveshchensky, D. V., Maltseva, O. A., and Sergeeva, M. A.: Impact of magnetic storms on the global TEC distribution, Ann. Geophys. Discuss., https://doi.org/10.5194/angeo-2018-4, in review, 2018.
Donat V. Blagoveshchensky et al.
Donat V. Blagoveshchensky et al.
Donat V. Blagoveshchensky et al.

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