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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers | Copyright
https://doi.org/10.5194/angeo-2018-81
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 13 Jul 2018

Regular paper | 13 Jul 2018

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Annales Geophysicae (ANGEO).

ICME impact at Earth with low and typical Mach number plasma characteristics

Antti Lakka1, Tuija I. Pulkkinen1, Andrew P. Dimmock2, Emilia Kilpua3, Matti Ala-Lahti3, Ilja Honkonen4, Minna Palmroth3, and Osku Raukunen5 Antti Lakka et al.
  • 1Department of Electronics and Nanoengineering, Aalto University, Finland
  • 2Swedish Institute of Space Physics, Uppsala, Sweden
  • 3Department of Physics, University of Helsinki, Helsinki, Finland
  • 4Finnish Meteorological Institute, Helsinki, Finland
  • 5Department of Physics and Astronomy, University of Turku, Turku, Finland

Abstract. We study how the the Earth's magnetosphere responds to the fluctuating solar wind conditions caused by two different amplitude interplanetary coronal mass ejection (ICME) events by using the Grand Unified Magnetosphere-Ionosphere Coupling Simulation (GUMICS-4). ICME events are known to drive strong geomagnetic disturbances and thus generate conditions that may lead to saturation of the cross-polar cap potential (CPCP). The two ICME events occurred on 15–16 July 2012 and 29–30 April 2014. During the 2012 event, the solar wind upstream values reached up to 35particles/cm3, speed of 694km/s, and interplanetary magnetic field of 22nT. The event of 2014 was a moderate one, with the corresponding upstream values of 30particles/cm3, 320km/s and 10nT. The mean upstream Alfvén Mach number was 2.3 for the 2012 event, while it was 5.8 for the 2014 event. We examine how the Earth's space environment dynamics evolves during both ICME events covering both global and local perspectives. To validate the accuracy of the GUMICS-4 simulation we use satellite data from several missions located in different parts of the magnetosphere. It is shown that the CPCP saturation is affected by the upstream conditions, with strong dependence on the Alfvén Mach number.

Antti Lakka et al.
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Antti Lakka et al.
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We study how the the Earth's space environment responds to two different amplitude interplanetary coronal mass ejection (ICME) events that occurred in 2012 and 2014 by using GUMICS-4 global MHD model. We examine local and large-scale dynamics of the Earth's space environment and compare simulation results to satellite data. It is shown that the Earth's ionospheric potential saturation takes place only during the 2012 event due to favourable solar wind conditions.
We study how the the Earth's space environment responds to two different amplitude...
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