Estimates of the field-aligned current density in current-carrying filaments using auroral zone ground-based observations
International audience 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 u...
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Online Access: | https://hal.science/hal-00316867 https://hal.science/hal-00316867/document https://hal.science/hal-00316867/file/angeo-19-699-2001.pdf |
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ftccsdartic:oai:HAL:hal-00316867v1 2023-11-12T04:20:17+01:00 Estimates of the field-aligned current density in current-carrying filaments using auroral zone ground-based observations Danielides, M. A. Shalimov, S. Kangas, J. Department of Physical Sciences Oulu University of Oulu Schmidt United Institute of Physics of the Earth Moscow (IPE) Russian Academy of Sciences Moscow (RAS) Sodankylä Geophysical Observatory 2001 https://hal.science/hal-00316867 https://hal.science/hal-00316867/document https://hal.science/hal-00316867/file/angeo-19-699-2001.pdf en eng HAL CCSD European Geosciences Union hal-00316867 https://hal.science/hal-00316867 https://hal.science/hal-00316867/document https://hal.science/hal-00316867/file/angeo-19-699-2001.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316867 Annales Geophysicae, 2001, 19 (7), pp.699-706 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2001 ftccsdartic 2023-10-21T23:08:05Z International audience 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. Article in Journal/Newspaper Kilpisjärvi Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Kilpisjärvi ENVELOPE(20.767,20.767,69.034,69.034) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences 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 |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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. |
author2 |
Department of Physical Sciences Oulu University of Oulu Schmidt United Institute of Physics of the Earth Moscow (IPE) Russian Academy of Sciences Moscow (RAS) Sodankylä Geophysical Observatory |
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 |
HAL CCSD |
publishDate |
2001 |
url |
https://hal.science/hal-00316867 https://hal.science/hal-00316867/document https://hal.science/hal-00316867/file/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_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316867 Annales Geophysicae, 2001, 19 (7), pp.699-706 |
op_relation |
hal-00316867 https://hal.science/hal-00316867 https://hal.science/hal-00316867/document https://hal.science/hal-00316867/file/angeo-19-699-2001.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782336316636135424 |