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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-165
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-165
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 10 Jan 2020

Submitted as: regular paper | 10 Jan 2020

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This preprint is currently under review for the journal ANGEO.

From the Sun to the Earth: August 25, 2018 geomagnetic storm effects

Mirko Piersanti1, Paola De Michelis2, Dario Del Moro3, Roberta Tozzi2, Michael Pezzopane2, Giuseppe Consolini4, Maria Federica Marcucci4, Monica Laurenza4, Simone Di Matteo5, Alessio Pignalberi2, Virgilio Quattrociocchi4,6, and Piero Diego4 Mirko Piersanti et al.
  • 1INFN - University of Rome "Tor Vergata", Rome, Italy
  • 2Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
  • 3University of Rome "Tor Vergata", Rome, Italy
  • 4INAF-Istituto di Astrofisica e Planetologia Spaziali, Rome, Italy
  • 5Catholic University of America at NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
  • 6Dpt. of Physical and Chemical Sciences, University of L'Aquila, L'Aquila, Italy

Abstract. On August 25, 2018 the interplanetary counterpart of the August 20, 2018 Coronal Mass Ejection (CME) hit the Earth, giving rise to a strong G3 geomagnetic storm. We present a description of the whole sequence of events from the Sun to the ground as well as a detailed analysis of the observed effects on the Earth's environment by using a multi instrumental approach. We studied the ICME propagation in the interplanetary space up to the analysis of its effects in the magnetosphere, ionosphere and at ground. To accomplish this task, we used ground and space collected data, including data from CSES (China Seismo Electric Satellite), launched on February 11, 2018. We found a direct connection between the ICME impact point onto the magnetopause and the pattern of the Earth's polar electrojects. Using the Tsyganenko TS04 model prevision, we were able to correctly identify the principal magnetospheric current system activating during the different phases of the geomagnetic storm. Moreover, we analyzed the space-weather effects associated with the August 25, 2018 solar event in terms of evaluation geomagnetically induced currents (GIC) and identification of possible GPS loss of lock. We found that, despite the strong geomagnetic storm, no loss of lock has been detected. On the contrary, the GIC hazard was found to be potentially more dangerous than other past, more powerful solar events, such as the St. Patrick geomagnetic storm, especially at latitudes higher than 60° in the European sector.

Mirko Piersanti et al.

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Short summary
This paper presents a comprehensive analysis of the solar event occurred on August 25, 2018. This kind of comprehensive analysis plays a key role to better understand the complexity of the processes occurring in the Sun-Earth system that determines the geoeffectiveness of solar activity manifestations. The analysis presented her shows for the first time a direct link among the solar perturbation characteristics, the magnetosphere-ionosphere system response, and the Space Weather effects.
This paper presents a comprehensive analysis of the solar event occurred on August 25, 2018....
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