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Seismogenic Disturbances of the Ionosphere During High Geomagnetic Activity

1
Laboratory of Computer modeling of physical processes in the near-Earth environment, Murmansk Arctic State University, Murmansk 183038, Russia
2
Kaliningrad Department of the Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation (IZMIRAN), Russian Academy of Sciences, Kaliningrad 236016, Russia
3
Laboratory of applied radiophysical research of the atmosphere and ionosphere, Immanuel Kant Baltic Federal University, Kaliningrad 236016, Russia
*
Author to whom correspondence should be addressed.
Atmosphere 2019, 10(7), 359; https://doi.org/10.3390/atmos10070359
Received: 23 May 2019 / Revised: 23 June 2019 / Accepted: 25 June 2019 / Published: 28 June 2019
(This article belongs to the Special Issue Lithosphere–Atmosphere–Ionosphere Coupling (LAIC) Models)
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Abstract

Herein, we analyze the variations in the ionosphere for the period of two weeks before the M6.7 earthquake in India on 3 January 2016. The earthquake occurred after a series of magnetic substorms on 31 December 2015 and 1 January 2016. The relative total electron content (TEC) disturbances have been estimated using global TEC maps and calculated numerically using the 3D global first-principle Upper Atmosphere Model (UAM) for the whole period including the days before, during, and after the substorms. Numerical simulations were repeated with the seismogenic vertical electric currents switched on at the earthquake epicenter. The UAM calculations have reproduced the general behavior of the ionosphere after the main phase of the geomagnetic storm on 1 January 2016 in the form of negative TEC disturbances propagating from high latitudes, being especially strong in the Southern (summer condition) Hemisphere. It was shown that the local ionospheric effects of seismic origin can be identified in the background of the global geomagnetic disturbances. The seismo-ionospheric effects are visible in the nighttime regions with the additional negative TEC disturbances extending from the eastern side of the epicenter meridian to the western side, both in the observations and in the UAM simulations. It was found that the vertical electric field and corresponding westward component of the electromagnetic [E × B] drift played a decisive role in the formation of the ionospheric precursors of this earthquake. View Full-Text
Keywords: earthquake; total electron content; ionosphere; modeling; electric field earthquake; total electron content; ionosphere; modeling; electric field
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Namgaladze, A.; Karpov, M.; Knyazeva, M. Seismogenic Disturbances of the Ionosphere During High Geomagnetic Activity. Atmosphere 2019, 10, 359.

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