Ann. Geophysicae 18, 1097±1107 �2000) Ó EGS ± Springer-Verlag 2000 The dawn and dusk electrojet response to substorm onset
Abstract. 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 onse...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.371.4530 2023-05-15T16:04:45+02:00 Ann. Geophysicae 18, 1097±1107 �2000) Ó EGS ± Springer-Verlag 2000 The dawn and dusk electrojet response to substorm onset E. Boraè Lv P. Eglitis H. J. Opgenoorth E. Donovan G. Reeves P. Stauning The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.4530 http://hal.archives-ouvertes.fr/docs/00/31/67/82/PDF/angeo-18-1097-2000.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.4530 http://hal.archives-ouvertes.fr/docs/00/31/67/82/PDF/angeo-18-1097-2000.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://hal.archives-ouvertes.fr/docs/00/31/67/82/PDF/angeo-18-1097-2000.pdf more localized substorm current wedge. The convection text ftciteseerx 2016-01-08T01:19:41Z Abstract. 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 identi®ed 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 ®rst few minutes following substorm onset, sudden enhancements of the electrojets were identi®ed 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 ¯ows from the near-Earth neutral line model. Case studies with ionospheric coherent �SuperDARN) and incoherent �EISCAT) radars have been performed to see whether a convectioninduced electric ®eld or enhanced conductivity is the main agent for the reactions in the electrojets. The results indicate an imposed electric ®eld enhancement. Text EISCAT Greenland Unknown Greenland |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
topic |
more localized substorm current wedge. The convection |
spellingShingle |
more localized substorm current wedge. The convection E. Boraè Lv P. Eglitis H. J. Opgenoorth E. Donovan G. Reeves P. Stauning Ann. Geophysicae 18, 1097±1107 �2000) Ó EGS ± Springer-Verlag 2000 The dawn and dusk electrojet response to substorm onset |
topic_facet |
more localized substorm current wedge. The convection |
description |
Abstract. 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 identi®ed 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 ®rst few minutes following substorm onset, sudden enhancements of the electrojets were identi®ed 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 ¯ows from the near-Earth neutral line model. Case studies with ionospheric coherent �SuperDARN) and incoherent �EISCAT) radars have been performed to see whether a convectioninduced electric ®eld or enhanced conductivity is the main agent for the reactions in the electrojets. The results indicate an imposed electric ®eld enhancement. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
E. Boraè Lv P. Eglitis H. J. Opgenoorth E. Donovan G. Reeves P. Stauning |
author_facet |
E. Boraè Lv P. Eglitis H. J. Opgenoorth E. Donovan G. Reeves P. Stauning |
author_sort |
E. Boraè Lv |
title |
Ann. Geophysicae 18, 1097±1107 �2000) Ó EGS ± Springer-Verlag 2000 The dawn and dusk electrojet response to substorm onset |
title_short |
Ann. Geophysicae 18, 1097±1107 �2000) Ó EGS ± Springer-Verlag 2000 The dawn and dusk electrojet response to substorm onset |
title_full |
Ann. Geophysicae 18, 1097±1107 �2000) Ó EGS ± Springer-Verlag 2000 The dawn and dusk electrojet response to substorm onset |
title_fullStr |
Ann. Geophysicae 18, 1097±1107 �2000) Ó EGS ± Springer-Verlag 2000 The dawn and dusk electrojet response to substorm onset |
title_full_unstemmed |
Ann. Geophysicae 18, 1097±1107 �2000) Ó EGS ± Springer-Verlag 2000 The dawn and dusk electrojet response to substorm onset |
title_sort |
ann. geophysicae 18, 1097±1107 �2000) ó egs ± springer-verlag 2000 the dawn and dusk electrojet response to substorm onset |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.4530 http://hal.archives-ouvertes.fr/docs/00/31/67/82/PDF/angeo-18-1097-2000.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
EISCAT Greenland |
genre_facet |
EISCAT Greenland |
op_source |
http://hal.archives-ouvertes.fr/docs/00/31/67/82/PDF/angeo-18-1097-2000.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.4530 http://hal.archives-ouvertes.fr/docs/00/31/67/82/PDF/angeo-18-1097-2000.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766400387973120000 |