Excitation of Alfvén impulse by the anomalous resistance onset on the auroral field lines

Excitation of Alfvén impulse by the anomalous resistance onset on the auroral field lines

The onset of anomalous resistance in a layer on auroral field lines is shown to be accompanied by the excitation of an Alfvénic impulse (AI). The generated AI marks the transition of the global magnetosphere-ionosphere instability into an explosive phase with positive feedback. The sp...

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Main Authors: V. Pilipenko, N. Mazur, E. Fedorov, T. Uozumi, K. Yumoto
Format: Article
Language:English
Published: Copernicus Publications 2005-06-01
Series:Annales Geophysicae
Online Access:https://www.ann-geophys.net/23/1455/2005/angeo-23-1455-2005.pdf
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spelling doaj-89952b4a75e646ff9b2e1ea3c4feebfb2020-11-25T00:29:49ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762005-06-01231455146510.5194/angeo-23-1455-2005Excitation of Alfvén impulse by the anomalous resistance onset on the auroral field linesV. Pilipenko0N. Mazur1E. Fedorov2T. Uozumi3K. Yumoto4Institute of the Physics of the Earth, Moscow, RussiaInstitute of the Physics of the Earth, Moscow, RussiaInstitute of the Physics of the Earth, Moscow, RussiaSpace Environment Research Center, Kyushu University, Fukuoka, JapanSpace Environment Research Center, Kyushu University, Fukuoka, JapanThe onset of anomalous resistance in a layer on auroral field lines is shown to be accompanied by the excitation of an Alfvénic impulse (AI). The generated AI marks the transition of the global magnetosphere-ionosphere instability into an explosive phase with positive feedback. The spatial structure of this impulse both in space and on the ground has been described analytically and numerically under the thin layer approximation. The field-aligned currents transported by the Alfvénic impulse are concentrated near the edges of the layer with anomalous resistivity, whereas the reverse currents are spread throughout the layer. For some parameters of the layer the ionospheric attenuation of even small-scale structures is not dramatically large, so the magnetic response to the generated AI may be observed on the ground. The considered event on 3 January 1997 with magnetic-auroral intensification observed by ground magnetometers and Polar UV imager agrees with the model proposed.https://www.ann-geophys.net/23/1455/2005/angeo-23-1455-2005.pdf
collection DOAJ
language English
format Article
sources DOAJ
author V. Pilipenko
N. Mazur
E. Fedorov
T. Uozumi
K. Yumoto
spellingShingle V. Pilipenko
N. Mazur
E. Fedorov
T. Uozumi
K. Yumoto
Excitation of Alfvén impulse by the anomalous resistance onset on the auroral field lines
Annales Geophysicae
author_facet V. Pilipenko
N. Mazur
E. Fedorov
T. Uozumi
K. Yumoto
author_sort V. Pilipenko
title Excitation of Alfvén impulse by the anomalous resistance onset on the auroral field lines
title_short Excitation of Alfvén impulse by the anomalous resistance onset on the auroral field lines
title_full Excitation of Alfvén impulse by the anomalous resistance onset on the auroral field lines
title_fullStr Excitation of Alfvén impulse by the anomalous resistance onset on the auroral field lines
title_full_unstemmed Excitation of Alfvén impulse by the anomalous resistance onset on the auroral field lines
title_sort excitation of alfvén impulse by the anomalous resistance onset on the auroral field lines
publisher Copernicus Publications
series Annales Geophysicae
issn 0992-7689
1432-0576
publishDate 2005-06-01
description The onset of anomalous resistance in a layer on auroral field lines is shown to be accompanied by the excitation of an Alfvénic impulse (AI). The generated AI marks the transition of the global magnetosphere-ionosphere instability into an explosive phase with positive feedback. The spatial structure of this impulse both in space and on the ground has been described analytically and numerically under the thin layer approximation. The field-aligned currents transported by the Alfvénic impulse are concentrated near the edges of the layer with anomalous resistivity, whereas the reverse currents are spread throughout the layer. For some parameters of the layer the ionospheric attenuation of even small-scale structures is not dramatically large, so the magnetic response to the generated AI may be observed on the ground. The considered event on 3 January 1997 with magnetic-auroral intensification observed by ground magnetometers and Polar UV imager agrees with the model proposed.
url https://www.ann-geophys.net/23/1455/2005/angeo-23-1455-2005.pdf
work_keys_str_mv AT vpilipenko excitationofalfvenimpulsebytheanomalousresistanceonsetontheauroralfieldlines
AT nmazur excitationofalfvenimpulsebytheanomalousresistanceonsetontheauroralfieldlines
AT efedorov excitationofalfvenimpulsebytheanomalousresistanceonsetontheauroralfieldlines
AT tuozumi excitationofalfvenimpulsebytheanomalousresistanceonsetontheauroralfieldlines
AT kyumoto excitationofalfvenimpulsebytheanomalousresistanceonsetontheauroralfieldlines
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