Unexpected Southern Hemisphere ionospheric response to geomagnetic storm of 15 August 2015
Geomagnetic storms are the most pronounced phenomenon of space weather. When studying ionospheric response to a storm of 15 August 2015, an unexpected phenomenon was observed at higher middle latitudes of the Southern Hemisphere. This phenomenon was a localized total electron content (TEC) enhanceme...
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ftdoajarticles:oai:doaj.org/article:2ceafe21bdab4991a424a41e198cd246 2023-05-15T18:21:08+02:00 Unexpected Southern Hemisphere ionospheric response to geomagnetic storm of 15 August 2015 I. Edemskiy J. Lastovicka D. Buresova J. B. Habarulema I. Nepomnyashchikh 2018-01-01T00:00:00Z https://doi.org/10.5194/angeo-36-71-2018 https://doaj.org/article/2ceafe21bdab4991a424a41e198cd246 EN eng Copernicus Publications https://www.ann-geophys.net/36/71/2018/angeo-36-71-2018.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-36-71-2018 0992-7689 1432-0576 https://doaj.org/article/2ceafe21bdab4991a424a41e198cd246 Annales Geophysicae, Vol 36, Pp 71-79 (2018) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2018 ftdoajarticles https://doi.org/10.5194/angeo-36-71-2018 2022-12-31T09:30:03Z Geomagnetic storms are the most pronounced phenomenon of space weather. When studying ionospheric response to a storm of 15 August 2015, an unexpected phenomenon was observed at higher middle latitudes of the Southern Hemisphere. This phenomenon was a localized total electron content (TEC) enhancement (LTE) in the form of two separated plumes, which peaked southward of South Africa. The plumes were first observed at 05:00 UT near the southwestern coast of Australia. The southern plume was associated with local time slightly after noontime (1–2 h after local noon). The plumes moved with the Sun. They peaked near 13:00 UT southward of South Africa. The southern plume kept constant geomagnetic latitude (63–64° S); it persisted for about 10 h, whereas the northern plume persisted for about 2 h more. Both plumes disappeared over the South Atlantic Ocean. No similar LTE event was observed during the prolonged solar activity minimum period of 2006–2009. In 2012–2016 we detected altogether 26 LTEs and all of them were associated with the southward excursion of Bz. The negative Bz excursion is a necessary but not sufficient condition for the LTE occurrence as during some geomagnetic storms associated with negative Bz excursions the LTE events did not appear. Article in Journal/Newspaper South Atlantic Ocean Directory of Open Access Journals: DOAJ Articles Annales Geophysicae 36 1 71 79 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
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Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 I. Edemskiy J. Lastovicka D. Buresova J. B. Habarulema I. Nepomnyashchikh Unexpected Southern Hemisphere ionospheric response to geomagnetic storm of 15 August 2015 |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Geomagnetic storms are the most pronounced phenomenon of space weather. When studying ionospheric response to a storm of 15 August 2015, an unexpected phenomenon was observed at higher middle latitudes of the Southern Hemisphere. This phenomenon was a localized total electron content (TEC) enhancement (LTE) in the form of two separated plumes, which peaked southward of South Africa. The plumes were first observed at 05:00 UT near the southwestern coast of Australia. The southern plume was associated with local time slightly after noontime (1–2 h after local noon). The plumes moved with the Sun. They peaked near 13:00 UT southward of South Africa. The southern plume kept constant geomagnetic latitude (63–64° S); it persisted for about 10 h, whereas the northern plume persisted for about 2 h more. Both plumes disappeared over the South Atlantic Ocean. No similar LTE event was observed during the prolonged solar activity minimum period of 2006–2009. In 2012–2016 we detected altogether 26 LTEs and all of them were associated with the southward excursion of Bz. The negative Bz excursion is a necessary but not sufficient condition for the LTE occurrence as during some geomagnetic storms associated with negative Bz excursions the LTE events did not appear. |
format |
Article in Journal/Newspaper |
author |
I. Edemskiy J. Lastovicka D. Buresova J. B. Habarulema I. Nepomnyashchikh |
author_facet |
I. Edemskiy J. Lastovicka D. Buresova J. B. Habarulema I. Nepomnyashchikh |
author_sort |
I. Edemskiy |
title |
Unexpected Southern Hemisphere ionospheric response to geomagnetic storm of 15 August 2015 |
title_short |
Unexpected Southern Hemisphere ionospheric response to geomagnetic storm of 15 August 2015 |
title_full |
Unexpected Southern Hemisphere ionospheric response to geomagnetic storm of 15 August 2015 |
title_fullStr |
Unexpected Southern Hemisphere ionospheric response to geomagnetic storm of 15 August 2015 |
title_full_unstemmed |
Unexpected Southern Hemisphere ionospheric response to geomagnetic storm of 15 August 2015 |
title_sort |
unexpected southern hemisphere ionospheric response to geomagnetic storm of 15 august 2015 |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/angeo-36-71-2018 https://doaj.org/article/2ceafe21bdab4991a424a41e198cd246 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Annales Geophysicae, Vol 36, Pp 71-79 (2018) |
op_relation |
https://www.ann-geophys.net/36/71/2018/angeo-36-71-2018.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-36-71-2018 0992-7689 1432-0576 https://doaj.org/article/2ceafe21bdab4991a424a41e198cd246 |
op_doi |
https://doi.org/10.5194/angeo-36-71-2018 |
container_title |
Annales Geophysicae |
container_volume |
36 |
container_issue |
1 |
container_start_page |
71 |
op_container_end_page |
79 |
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1766200245784412160 |