The dawn and dusk electrojet response to substorm onset
We have investigated the time delay between substorm onset and related reactions in the dawn and dusk ionospheric electrojets, clearly separated from the nightside located substorm current wedge by several hours in MLT. We looked for substorm onsets occurring over Greenland, where the onset was iden...
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ftdoajarticles:oai:doaj.org/article:187a2d7668db4d63a6be65f2bc256909 2023-05-15T16:04:46+02:00 The dawn and dusk electrojet response to substorm onset E. Borälv P. Eglitis H. J. Opgenoorth E. Donovan G. Reeves P. Stauning 2000-09-01T00:00:00Z https://doi.org/10.1007/s00585-000-1097-4 https://doaj.org/article/187a2d7668db4d63a6be65f2bc256909 EN eng Copernicus Publications https://www.ann-geophys.net/18/1097/2000/angeo-18-1097-2000.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-000-1097-4 0992-7689 1432-0576 https://doaj.org/article/187a2d7668db4d63a6be65f2bc256909 Annales Geophysicae, Vol 18, Pp 1097-1107 (2000) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2000 ftdoajarticles https://doi.org/10.1007/s00585-000-1097-4 2022-12-31T14:58:11Z We have investigated the time delay between substorm onset and related reactions in the dawn and dusk ionospheric electrojets, clearly separated from the nightside located substorm current wedge by several hours in MLT. We looked for substorm onsets occurring over Greenland, where the onset was identified by a LANL satellite and DMI magnetometers located on Greenland. With this setup the MARIA magnetometer network was located at dusk, monitoring the eastward electrojet, and the IMAGE chain at dawn, for the westward jet. In the first few minutes following substorm onset, sudden enhancements of the electrojets were identified by looking for rapid changes in magnetograms. These results show that the speed of information transfer between the region of onset and the dawn and dusk ionosphere is very high. A number of events where the reaction seemed to preceed the onset were explained by either unfavorable instrument locations, preventing proper onset timing, or by the inner magnetosphere's reaction to the Earthward fast flows from the near-Earth neutral line model. Case studies with ionospheric coherent (SuperDARN) and incoherent (EISCAT) radars have been performed to see whether a convection-induced electric field or enhanced conductivity is the main agent for the reactions in the electrojets. The results indicate an imposed electric field enhancement. Key words: Ionosphere (auroral ionosphere; electric fields and currents) - Magnetospheric physics (storms and substorms) Article in Journal/Newspaper EISCAT Greenland Directory of Open Access Journals: DOAJ Articles Greenland Annales Geophysicae 18 9 1097 1107 |
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. Borälv P. Eglitis H. J. Opgenoorth E. Donovan G. Reeves P. Stauning The dawn and dusk electrojet response to substorm onset |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
We have investigated the time delay between substorm onset and related reactions in the dawn and dusk ionospheric electrojets, clearly separated from the nightside located substorm current wedge by several hours in MLT. We looked for substorm onsets occurring over Greenland, where the onset was identified by a LANL satellite and DMI magnetometers located on Greenland. With this setup the MARIA magnetometer network was located at dusk, monitoring the eastward electrojet, and the IMAGE chain at dawn, for the westward jet. In the first few minutes following substorm onset, sudden enhancements of the electrojets were identified by looking for rapid changes in magnetograms. These results show that the speed of information transfer between the region of onset and the dawn and dusk ionosphere is very high. A number of events where the reaction seemed to preceed the onset were explained by either unfavorable instrument locations, preventing proper onset timing, or by the inner magnetosphere's reaction to the Earthward fast flows from the near-Earth neutral line model. Case studies with ionospheric coherent (SuperDARN) and incoherent (EISCAT) radars have been performed to see whether a convection-induced electric field or enhanced conductivity is the main agent for the reactions in the electrojets. The results indicate an imposed electric field enhancement. Key words: Ionosphere (auroral ionosphere; electric fields and currents) - Magnetospheric physics (storms and substorms) |
format |
Article in Journal/Newspaper |
author |
E. Borälv P. Eglitis H. J. Opgenoorth E. Donovan G. Reeves P. Stauning |
author_facet |
E. Borälv P. Eglitis H. J. Opgenoorth E. Donovan G. Reeves P. Stauning |
author_sort |
E. Borälv |
title |
The dawn and dusk electrojet response to substorm onset |
title_short |
The dawn and dusk electrojet response to substorm onset |
title_full |
The dawn and dusk electrojet response to substorm onset |
title_fullStr |
The dawn and dusk electrojet response to substorm onset |
title_full_unstemmed |
The dawn and dusk electrojet response to substorm onset |
title_sort |
dawn and dusk electrojet response to substorm onset |
publisher |
Copernicus Publications |
publishDate |
2000 |
url |
https://doi.org/10.1007/s00585-000-1097-4 https://doaj.org/article/187a2d7668db4d63a6be65f2bc256909 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
EISCAT Greenland |
genre_facet |
EISCAT Greenland |
op_source |
Annales Geophysicae, Vol 18, Pp 1097-1107 (2000) |
op_relation |
https://www.ann-geophys.net/18/1097/2000/angeo-18-1097-2000.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-000-1097-4 0992-7689 1432-0576 https://doaj.org/article/187a2d7668db4d63a6be65f2bc256909 |
op_doi |
https://doi.org/10.1007/s00585-000-1097-4 |
container_title |
Annales Geophysicae |
container_volume |
18 |
container_issue |
9 |
container_start_page |
1097 |
op_container_end_page |
1107 |
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1766400392613068800 |