Estimates of the field-aligned current density in current-carrying filaments using auroral zone ground-based observations
We described the ground signatures of dynamic substorm features as observed by the imaging riometer, magnetometers and all-sky camera (ASC) at Kilpisjärvi, Finland on 5 and 25 October 1999 during the late evening hours. The magnetometer data was consistent with the motion of up-ward field-aligned cu...
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2001
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00036383 2023-05-15T17:03:43+02:00 Estimates of the field-aligned current density in current-carrying filaments using auroral zone ground-based observations Danielides, M. A. Shalimov, S. Kangas, J. 2001-07 electronic https://doi.org/10.5194/angeo-19-699-2001 https://noa.gwlb.de/receive/cop_mods_00036383 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036337/angeo-19-699-2001.pdf https://angeo.copernicus.org/articles/19/699/2001/angeo-19-699-2001.pdf eng eng Copernicus Publications Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-19-699-2001 https://noa.gwlb.de/receive/cop_mods_00036383 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036337/angeo-19-699-2001.pdf https://angeo.copernicus.org/articles/19/699/2001/angeo-19-699-2001.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2001 ftnonlinearchiv https://doi.org/10.5194/angeo-19-699-2001 2022-02-08T22:44:01Z We described the ground signatures of dynamic substorm features as observed by the imaging riometer, magnetometers and all-sky camera (ASC) at Kilpisjärvi, Finland on 5 and 25 October 1999 during the late evening hours. The magnetometer data was consistent with the motion of up-ward field-aligned currents (FACs) associated with absorption patches moving within the field of view of the riometer. We used riometer data in order to estimate the intensity of FACs associated with these local current-carrying filaments. It is shown that during these events, the estimated FAC intensity exceeds a threshold value that corresponds to the excitation of the low-frequency turbulence in the upper ionosphere. As a result, a quasi-oscillating regime of anomalous resistivity on the auroral field lines can give rise to the burst-like electron acceleration responsible for simultaneously observed auroral forms and bursts of Pi1B pulsations. Key words. Ionosphere (active experiments; auroral ionosphere; electric fields and currents) Article in Journal/Newspaper Kilpisjärvi Niedersächsisches Online-Archiv NOA Kilpisjärvi ENVELOPE(20.767,20.767,69.034,69.034) Annales Geophysicae 19 7 699 706 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Danielides, M. A. Shalimov, S. Kangas, J. Estimates of the field-aligned current density in current-carrying filaments using auroral zone ground-based observations |
topic_facet |
article Verlagsveröffentlichung |
description |
We described the ground signatures of dynamic substorm features as observed by the imaging riometer, magnetometers and all-sky camera (ASC) at Kilpisjärvi, Finland on 5 and 25 October 1999 during the late evening hours. The magnetometer data was consistent with the motion of up-ward field-aligned currents (FACs) associated with absorption patches moving within the field of view of the riometer. We used riometer data in order to estimate the intensity of FACs associated with these local current-carrying filaments. It is shown that during these events, the estimated FAC intensity exceeds a threshold value that corresponds to the excitation of the low-frequency turbulence in the upper ionosphere. As a result, a quasi-oscillating regime of anomalous resistivity on the auroral field lines can give rise to the burst-like electron acceleration responsible for simultaneously observed auroral forms and bursts of Pi1B pulsations. Key words. Ionosphere (active experiments; auroral ionosphere; electric fields and currents) |
format |
Article in Journal/Newspaper |
author |
Danielides, M. A. Shalimov, S. Kangas, J. |
author_facet |
Danielides, M. A. Shalimov, S. Kangas, J. |
author_sort |
Danielides, M. A. |
title |
Estimates of the field-aligned current density in current-carrying filaments using auroral zone ground-based observations |
title_short |
Estimates of the field-aligned current density in current-carrying filaments using auroral zone ground-based observations |
title_full |
Estimates of the field-aligned current density in current-carrying filaments using auroral zone ground-based observations |
title_fullStr |
Estimates of the field-aligned current density in current-carrying filaments using auroral zone ground-based observations |
title_full_unstemmed |
Estimates of the field-aligned current density in current-carrying filaments using auroral zone ground-based observations |
title_sort |
estimates of the field-aligned current density in current-carrying filaments using auroral zone ground-based observations |
publisher |
Copernicus Publications |
publishDate |
2001 |
url |
https://doi.org/10.5194/angeo-19-699-2001 https://noa.gwlb.de/receive/cop_mods_00036383 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036337/angeo-19-699-2001.pdf https://angeo.copernicus.org/articles/19/699/2001/angeo-19-699-2001.pdf |
long_lat |
ENVELOPE(20.767,20.767,69.034,69.034) |
geographic |
Kilpisjärvi |
geographic_facet |
Kilpisjärvi |
genre |
Kilpisjärvi |
genre_facet |
Kilpisjärvi |
op_relation |
Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-19-699-2001 https://noa.gwlb.de/receive/cop_mods_00036383 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00036337/angeo-19-699-2001.pdf https://angeo.copernicus.org/articles/19/699/2001/angeo-19-699-2001.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/angeo-19-699-2001 |
container_title |
Annales Geophysicae |
container_volume |
19 |
container_issue |
7 |
container_start_page |
699 |
op_container_end_page |
706 |
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1766057643544150016 |