The effect of magnetic substorms on near-ground atmospheric current
Ionosphere-magnetosphere disturbances at high latitudes, e.g. magnetic substorms, are accompanied by energetic particle precipitation and strong variations of the ionospheric electric fields and currents. These might reasonably be expected to modify the local atmospheric electric circuit. We have an...
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ftdoajarticles:oai:doaj.org/article:039cb84dee604befbe38f00947ab4d1d 2023-05-15T17:44:54+02:00 The effect of magnetic substorms on near-ground atmospheric current E. Belova S. Kirkwood H. Tammet 2000-12-01T00:00:00Z https://doi.org/10.1007/s00585-001-1623-z https://doaj.org/article/039cb84dee604befbe38f00947ab4d1d EN eng Copernicus Publications https://www.ann-geophys.net/18/1623/2000/angeo-18-1623-2000.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-001-1623-z 0992-7689 1432-0576 https://doaj.org/article/039cb84dee604befbe38f00947ab4d1d Annales Geophysicae, Vol 18, Pp 1623-1629 (2000) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2000 ftdoajarticles https://doi.org/10.1007/s00585-001-1623-z 2022-12-31T12:22:20Z Ionosphere-magnetosphere disturbances at high latitudes, e.g. magnetic substorms, are accompanied by energetic particle precipitation and strong variations of the ionospheric electric fields and currents. These might reasonably be expected to modify the local atmospheric electric circuit. We have analysed air-earth vertical currents (AECs) measured by a long wire antenna at Esrange, northern Sweden during 35 geomagnetic substorms. Using superposed epoch analysis we compare the air-earth current variations during the 3 h before and after the time of the magnetic X-component minimum with those for corresponding local times on 35 days without substorms. After elimination of the average daily variation we can conclude that the effect of substorms on AEC is small but distinguishable. It is speculated that the AEC increases observed during about 2 h prior to the geomagnetic X-component minimum, are due to enhancement of the ionospheric electric field. During the subsequent 2 h of the substorm recovery phase, the difference between "substorm" and "quiet" atmospheric currents decreases. The amplitude of this "substorm" variation of AEC is estimated to be less than 50% of the amplitude of the diurnal variation in AEC during the same time interval . The statistical significance of this result was confirmed using the Van der Waerden X-test. This method was further used to show that the average air-earth current and its fluctuations increase during late expansion and early recovery phases of substorms. Key words: Ionosphere (electric fields and currents) · Magnetospheric physics (storms and substorms) · Meteorology and atmospheric dynamics (atmospheric electricity) Article in Journal/Newspaper Northern Sweden Directory of Open Access Journals: DOAJ Articles Esrange ENVELOPE(21.117,21.117,67.883,67.883) Annales Geophysicae 18 12 1623 1629 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 E. Belova S. Kirkwood H. Tammet The effect of magnetic substorms on near-ground atmospheric current |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Ionosphere-magnetosphere disturbances at high latitudes, e.g. magnetic substorms, are accompanied by energetic particle precipitation and strong variations of the ionospheric electric fields and currents. These might reasonably be expected to modify the local atmospheric electric circuit. We have analysed air-earth vertical currents (AECs) measured by a long wire antenna at Esrange, northern Sweden during 35 geomagnetic substorms. Using superposed epoch analysis we compare the air-earth current variations during the 3 h before and after the time of the magnetic X-component minimum with those for corresponding local times on 35 days without substorms. After elimination of the average daily variation we can conclude that the effect of substorms on AEC is small but distinguishable. It is speculated that the AEC increases observed during about 2 h prior to the geomagnetic X-component minimum, are due to enhancement of the ionospheric electric field. During the subsequent 2 h of the substorm recovery phase, the difference between "substorm" and "quiet" atmospheric currents decreases. The amplitude of this "substorm" variation of AEC is estimated to be less than 50% of the amplitude of the diurnal variation in AEC during the same time interval . The statistical significance of this result was confirmed using the Van der Waerden X-test. This method was further used to show that the average air-earth current and its fluctuations increase during late expansion and early recovery phases of substorms. Key words: Ionosphere (electric fields and currents) · Magnetospheric physics (storms and substorms) · Meteorology and atmospheric dynamics (atmospheric electricity) |
format |
Article in Journal/Newspaper |
author |
E. Belova S. Kirkwood H. Tammet |
author_facet |
E. Belova S. Kirkwood H. Tammet |
author_sort |
E. Belova |
title |
The effect of magnetic substorms on near-ground atmospheric current |
title_short |
The effect of magnetic substorms on near-ground atmospheric current |
title_full |
The effect of magnetic substorms on near-ground atmospheric current |
title_fullStr |
The effect of magnetic substorms on near-ground atmospheric current |
title_full_unstemmed |
The effect of magnetic substorms on near-ground atmospheric current |
title_sort |
effect of magnetic substorms on near-ground atmospheric current |
publisher |
Copernicus Publications |
publishDate |
2000 |
url |
https://doi.org/10.1007/s00585-001-1623-z https://doaj.org/article/039cb84dee604befbe38f00947ab4d1d |
long_lat |
ENVELOPE(21.117,21.117,67.883,67.883) |
geographic |
Esrange |
geographic_facet |
Esrange |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_source |
Annales Geophysicae, Vol 18, Pp 1623-1629 (2000) |
op_relation |
https://www.ann-geophys.net/18/1623/2000/angeo-18-1623-2000.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-001-1623-z 0992-7689 1432-0576 https://doaj.org/article/039cb84dee604befbe38f00947ab4d1d |
op_doi |
https://doi.org/10.1007/s00585-001-1623-z |
container_title |
Annales Geophysicae |
container_volume |
18 |
container_issue |
12 |
container_start_page |
1623 |
op_container_end_page |
1629 |
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1766147207266828288 |