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The Magnetic Storm of August 25–26, 2018: Dayside High Latitude Geomagnetic Variations and Pulsations

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Abstract

The features of daytime high latitude geomagnetic disturbances and geomagnetic pulsations during the recent strong magnetic storm on August 25–26, 2018, which occurred at the end of the decline phase of the 24th solar activity cycle with a very low level of solar flare activity, are considered. As a rule, during this phase of the solar activity cycle, magnetic storms are caused by high-speed solar wind flows from coronal holes; however, the magnetic storms during the decay of the 24th cycle were caused by coronal mass ejections (CMEs). It was shown that, despite very weak disturbances on the Sun and a low solar wind speed, a rather strong magnetic storm occurred in the Earth’s magnetosphere in August 2018 (Dst = –171 nT). The storm SC with a slight (~25 nT) jump in the Dst index caused quite intense daytime geomagnetic pulsations ipcl at the latitudes of the possible position of the daytime polar cusp. A feature of the recovery phase of this storm was the development of a magnetosphere substorm on a global scale, i.e., the appearance of a negative magnetic bay recorded simultaneously in the auroral night sector and in the polar latitudes of the day sector. A possible interpretation is considered.

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Authors and Affiliations

  1. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 123995, Moscow, Russia

    N. G. Kleimenova & L. M. Malysheva

  2. Space Research Institute, Russian Academy of Sciences, 117997, Moscow, Russia

    N. G. Kleimenova

  3. Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, 108840, Troitsk, Moscow, Russia

    L. I. Gromova & S. V. Gromov

Authors
  1. N. G. Kleimenova
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  2. L. I. Gromova
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  3. S. V. Gromov
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  4. L. M. Malysheva
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Correspondence to N. G. Kleimenova or L. I. Gromova.

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Kleimenova, N.G., Gromova, L.I., Gromov, S.V. et al. The Magnetic Storm of August 25–26, 2018: Dayside High Latitude Geomagnetic Variations and Pulsations. Geomagn. Aeron. 59, 660–667 (2019). https://doi.org/10.1134/S0016793219060070

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  • DOI: https://doi.org/10.1134/S0016793219060070

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