Propagation of a westward traveling surge and the development of persistent auroral features
Imaging instrumentation on board the spacecraft Dynamics Explorer 1 (DE 1) is used to observe the large-scale motion of a surge over 7000 km along the auroral oval from near local midnight. Average speed of the surge is 2.2 km/s. Ground-based observations at Fort Yukon, Alaska, show the classical lo...
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1989
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ftnasantrs:oai:casi.ntrs.nasa.gov:19890056323 2023-05-15T18:48:57+02:00 Propagation of a westward traveling surge and the development of persistent auroral features Craven, J. D. Frank, L. A. Akasofu, S.-I. Unclassified, Unlimited, Publicly available Jun 1, 1989 http://ntrs.nasa.gov/search.jsp?R=19890056323 unknown http://ntrs.nasa.gov/search.jsp?R=19890056323 Accession ID: 89A43694 Copyright Other Sources 46 Journal of Geophysical Research; 94; 6961-696 AD-A213765 1989 ftnasantrs 2012-02-15T18:04:51Z Imaging instrumentation on board the spacecraft Dynamics Explorer 1 (DE 1) is used to observe the large-scale motion of a surge over 7000 km along the auroral oval from near local midnight. Average speed of the surge is 2.2 km/s. Ground-based observations at Fort Yukon, Alaska, show the classical looped, multiple-arc structure of a westward traveling surge as it passes overhead. Within the 6-min temporal resolution provided with DE 1, the surge advances initially at a speed of about 8 km/s followed by a steady decline to about 1 km/s over a period of 17 min. This sequence is then repeated a second time, beginning with a significant intensification of the surge form. This intense surge activity is not accompanied by significant auroral activity near magnetic midnight. Following passage of the surge, persistent and localized bright emission regions remain along the auroral oval for several tens of minutes. Average separation distances are approximately 700 km. If these persistent features identify the sites of individual stepwise advances of the surge, the average time per advance is about 5 min. Other/Unknown Material Alaska Yukon NASA Technical Reports Server (NTRS) Yukon |
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NASA Technical Reports Server (NTRS) |
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unknown |
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46 |
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46 Craven, J. D. Frank, L. A. Akasofu, S.-I. Propagation of a westward traveling surge and the development of persistent auroral features |
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46 |
description |
Imaging instrumentation on board the spacecraft Dynamics Explorer 1 (DE 1) is used to observe the large-scale motion of a surge over 7000 km along the auroral oval from near local midnight. Average speed of the surge is 2.2 km/s. Ground-based observations at Fort Yukon, Alaska, show the classical looped, multiple-arc structure of a westward traveling surge as it passes overhead. Within the 6-min temporal resolution provided with DE 1, the surge advances initially at a speed of about 8 km/s followed by a steady decline to about 1 km/s over a period of 17 min. This sequence is then repeated a second time, beginning with a significant intensification of the surge form. This intense surge activity is not accompanied by significant auroral activity near magnetic midnight. Following passage of the surge, persistent and localized bright emission regions remain along the auroral oval for several tens of minutes. Average separation distances are approximately 700 km. If these persistent features identify the sites of individual stepwise advances of the surge, the average time per advance is about 5 min. |
format |
Other/Unknown Material |
author |
Craven, J. D. Frank, L. A. Akasofu, S.-I. |
author_facet |
Craven, J. D. Frank, L. A. Akasofu, S.-I. |
author_sort |
Craven, J. D. |
title |
Propagation of a westward traveling surge and the development of persistent auroral features |
title_short |
Propagation of a westward traveling surge and the development of persistent auroral features |
title_full |
Propagation of a westward traveling surge and the development of persistent auroral features |
title_fullStr |
Propagation of a westward traveling surge and the development of persistent auroral features |
title_full_unstemmed |
Propagation of a westward traveling surge and the development of persistent auroral features |
title_sort |
propagation of a westward traveling surge and the development of persistent auroral features |
publishDate |
1989 |
url |
http://ntrs.nasa.gov/search.jsp?R=19890056323 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Yukon |
geographic_facet |
Yukon |
genre |
Alaska Yukon |
genre_facet |
Alaska Yukon |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19890056323 Accession ID: 89A43694 |
op_rights |
Copyright |
_version_ |
1766242346405462016 |