Ground-Based GNSS and Satellite Observations of Auroral Ionospheric Irregularities during Geomagnetic Disturbances in August 2018

The 25–26 August 2018 space weather event occurred during the solar minimum period and surprisingly became the third largest geomagnetic storm of the entire 24th solar cycle. We analyzed the ionospheric response at high latitudes of both hemispheres using multi-site ground-based GNSS observations an...

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Autores principales:	Irina Zakharenkova, Iurii Cherniak, Andrzej Krankowski
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ionosphere GNSS ionospheric irregularities ROTI geomagnetic storm auroral oval Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/0128c079960c409b8d5acc7bfe8d8313
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spelling	oai:doaj.org-article:0128c079960c409b8d5acc7bfe8d83132021-11-25T18:59:02ZGround-Based GNSS and Satellite Observations of Auroral Ionospheric Irregularities during Geomagnetic Disturbances in August 201810.3390/s212277491424-8220https://doaj.org/article/0128c079960c409b8d5acc7bfe8d83132021-11-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/22/7749https://doaj.org/toc/1424-8220The 25–26 August 2018 space weather event occurred during the solar minimum period and surprisingly became the third largest geomagnetic storm of the entire 24th solar cycle. We analyzed the ionospheric response at high latitudes of both hemispheres using multi-site ground-based GNSS observations and measurements onboard Swarm and DMSP satellites. With the storm development, the zones of intense ionospheric irregularities of auroral origin largely expanded in size and moved equatorward towards midlatitudes as far as ~55–60° magnetic latitude (MLAT) in the American, European, and Australian longitudinal sectors. The main ionospheric trough, associated with the equatorward side of the auroral oval, shifted as far equatorward as 45–50° MLAT at both hemispheres. The interhemispheric comparison revealed a high degree of similarity in a large expansion of the auroral irregularities oval towards midlatitudes, in addition to asymmetrical differences in terms of larger intensity of plasma density gradients and structures over the Southern auroral and polar cap regions. Evolution of the intense ionospheric irregularities and equatorward expansion of the auroral irregularities oval were well correlated with increases of geomagnetic activity and peaks of the auroral electrojet index.Irina ZakharenkovaIurii CherniakAndrzej KrankowskiMDPI AGarticleionosphereGNSSionospheric irregularitiesROTIgeomagnetic stormauroral ovalChemical technologyTP1-1185ENSensors, Vol 21, Iss 7749, p 7749 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ionosphere GNSS ionospheric irregularities ROTI geomagnetic storm auroral oval Chemical technology TP1-1185
spellingShingle	ionosphere GNSS ionospheric irregularities ROTI geomagnetic storm auroral oval Chemical technology TP1-1185 Irina Zakharenkova Iurii Cherniak Andrzej Krankowski Ground-Based GNSS and Satellite Observations of Auroral Ionospheric Irregularities during Geomagnetic Disturbances in August 2018
description	The 25–26 August 2018 space weather event occurred during the solar minimum period and surprisingly became the third largest geomagnetic storm of the entire 24th solar cycle. We analyzed the ionospheric response at high latitudes of both hemispheres using multi-site ground-based GNSS observations and measurements onboard Swarm and DMSP satellites. With the storm development, the zones of intense ionospheric irregularities of auroral origin largely expanded in size and moved equatorward towards midlatitudes as far as ~55–60° magnetic latitude (MLAT) in the American, European, and Australian longitudinal sectors. The main ionospheric trough, associated with the equatorward side of the auroral oval, shifted as far equatorward as 45–50° MLAT at both hemispheres. The interhemispheric comparison revealed a high degree of similarity in a large expansion of the auroral irregularities oval towards midlatitudes, in addition to asymmetrical differences in terms of larger intensity of plasma density gradients and structures over the Southern auroral and polar cap regions. Evolution of the intense ionospheric irregularities and equatorward expansion of the auroral irregularities oval were well correlated with increases of geomagnetic activity and peaks of the auroral electrojet index.
format	article
author	Irina Zakharenkova Iurii Cherniak Andrzej Krankowski
author_facet	Irina Zakharenkova Iurii Cherniak Andrzej Krankowski
author_sort	Irina Zakharenkova
title	Ground-Based GNSS and Satellite Observations of Auroral Ionospheric Irregularities during Geomagnetic Disturbances in August 2018
title_short	Ground-Based GNSS and Satellite Observations of Auroral Ionospheric Irregularities during Geomagnetic Disturbances in August 2018
title_full	Ground-Based GNSS and Satellite Observations of Auroral Ionospheric Irregularities during Geomagnetic Disturbances in August 2018
title_fullStr	Ground-Based GNSS and Satellite Observations of Auroral Ionospheric Irregularities during Geomagnetic Disturbances in August 2018
title_full_unstemmed	Ground-Based GNSS and Satellite Observations of Auroral Ionospheric Irregularities during Geomagnetic Disturbances in August 2018
title_sort	ground-based gnss and satellite observations of auroral ionospheric irregularities during geomagnetic disturbances in august 2018
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/0128c079960c409b8d5acc7bfe8d8313
work_keys_str_mv	AT irinazakharenkova groundbasedgnssandsatelliteobservationsofauroralionosphericirregularitiesduringgeomagneticdisturbancesinaugust2018 AT iuriicherniak groundbasedgnssandsatelliteobservationsofauroralionosphericirregularitiesduringgeomagneticdisturbancesinaugust2018 AT andrzejkrankowski groundbasedgnssandsatelliteobservationsofauroralionosphericirregularitiesduringgeomagneticdisturbancesinaugust2018
_version_	1718410443011129344

Ground-Based GNSS and Satellite Observations of Auroral Ionospheric Irregularities during Geomagnetic Disturbances in August 2018

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