© European Geosciences Union 2005 Dynamic rayed aurora and enhanced ion-acoustic radar echoes
Abstract. The generation mechanism for naturally enhanced ion-acoustic echoes is still debated. One important issue is how these enhancements are related to auroral activity. All events of enhanced ion-acoustic echoes observed simultaneously with the EISCAT Svalbard Radar (ESR) and with high-resolut...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.77.4105 2023-05-15T16:04:46+02:00 © European Geosciences Union 2005 Dynamic rayed aurora and enhanced ion-acoustic radar echoes E. M. Blixt T. Grydel N. Ivchenko T. Hagfors C. La Hoz B. S. Lanchester U. P. Løvhaug The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.77.4105 http://www.phys.uit.no/~tom/publications/2005/ag-23-3.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.77.4105 http://www.phys.uit.no/~tom/publications/2005/ag-23-3.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.phys.uit.no/~tom/publications/2005/ag-23-3.pdf text ftciteseerx 2016-01-08T19:09:36Z Abstract. The generation mechanism for naturally enhanced ion-acoustic echoes is still debated. One important issue is how these enhancements are related to auroral activity. All events of enhanced ion-acoustic echoes observed simultaneously with the EISCAT Svalbard Radar (ESR) and with high-resolution narrow field-of-view auroral imagers have been collected and studied. Characteristic of all the events is the appearance of very dynamic rayed aurora, and some of the intrinsic features of these auroral displays are identified. Several of these identified features are directly related to the presence of low energy (10–100 eV) precipitating electrons in addition to the higher energy population producing most of the associated light. The low energy contribution is vital for the formation of the enhanced ion-acoustic echoes. We argue that this type of aurora is sufficient for the generation of naturally enhanced ion-acoustic echoes. In one event two imagers were used to observe the auroral rays simultaneously, one from the radar site and one 7 km away. The data from these imagers shows that the auroral rays and the strong backscattering filaments (where the enhanced echoes are produced) are located on the same field line, which is in contrast to earlier statements in the litterature that they should be separated. Key words. Ionosphere (Auroral ionosphere; Plasma waves and instabilities; Particle acceleration) 1 Text EISCAT Svalbard Unknown Svalbard |
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Abstract. The generation mechanism for naturally enhanced ion-acoustic echoes is still debated. One important issue is how these enhancements are related to auroral activity. All events of enhanced ion-acoustic echoes observed simultaneously with the EISCAT Svalbard Radar (ESR) and with high-resolution narrow field-of-view auroral imagers have been collected and studied. Characteristic of all the events is the appearance of very dynamic rayed aurora, and some of the intrinsic features of these auroral displays are identified. Several of these identified features are directly related to the presence of low energy (10–100 eV) precipitating electrons in addition to the higher energy population producing most of the associated light. The low energy contribution is vital for the formation of the enhanced ion-acoustic echoes. We argue that this type of aurora is sufficient for the generation of naturally enhanced ion-acoustic echoes. In one event two imagers were used to observe the auroral rays simultaneously, one from the radar site and one 7 km away. The data from these imagers shows that the auroral rays and the strong backscattering filaments (where the enhanced echoes are produced) are located on the same field line, which is in contrast to earlier statements in the litterature that they should be separated. Key words. Ionosphere (Auroral ionosphere; Plasma waves and instabilities; Particle acceleration) 1 |
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The Pennsylvania State University CiteSeerX Archives |
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Text |
author |
E. M. Blixt T. Grydel N. Ivchenko T. Hagfors C. La Hoz B. S. Lanchester U. P. Løvhaug |
spellingShingle |
E. M. Blixt T. Grydel N. Ivchenko T. Hagfors C. La Hoz B. S. Lanchester U. P. Løvhaug © European Geosciences Union 2005 Dynamic rayed aurora and enhanced ion-acoustic radar echoes |
author_facet |
E. M. Blixt T. Grydel N. Ivchenko T. Hagfors C. La Hoz B. S. Lanchester U. P. Løvhaug |
author_sort |
E. M. Blixt |
title |
© European Geosciences Union 2005 Dynamic rayed aurora and enhanced ion-acoustic radar echoes |
title_short |
© European Geosciences Union 2005 Dynamic rayed aurora and enhanced ion-acoustic radar echoes |
title_full |
© European Geosciences Union 2005 Dynamic rayed aurora and enhanced ion-acoustic radar echoes |
title_fullStr |
© European Geosciences Union 2005 Dynamic rayed aurora and enhanced ion-acoustic radar echoes |
title_full_unstemmed |
© European Geosciences Union 2005 Dynamic rayed aurora and enhanced ion-acoustic radar echoes |
title_sort |
© european geosciences union 2005 dynamic rayed aurora and enhanced ion-acoustic radar echoes |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.77.4105 http://www.phys.uit.no/~tom/publications/2005/ag-23-3.pdf |
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Svalbard |
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Svalbard |
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EISCAT Svalbard |
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EISCAT Svalbard |
op_source |
http://www.phys.uit.no/~tom/publications/2005/ag-23-3.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.77.4105 http://www.phys.uit.no/~tom/publications/2005/ag-23-3.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766400391284523008 |