Dynamic rayed aurora and enhanced ion-acoustic radar echoes
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...
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2005
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ftunivtroemsoe:oai:munin.uit.no:10037/551 2024-06-02T08:05:58+00:00 Dynamic rayed aurora and enhanced ion-acoustic radar echoes Blixt, Erik Mårten Ivchenko, N. Hagfors, T. Grydeland, Tom Trondsen, T.S. La Hoz, Cesar Lanchester, B.S. Løvhaug, Unni Pia 2005-01-31 566238 bytes application/pdf https://hdl.handle.net/10037/551 eng eng European Geosciences Union Annales Geophysicae 23(2005), pp 3-11 1432-0576 (elektronisk) https://hdl.handle.net/10037/551 URN:NBN:no-uit_munin_378 openAccess ionosphere auroral ionosphere plasma waves and instabilities particle accelaration VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 Journal article Tidsskriftartikkel Peer reviewed 2005 ftunivtroemsoe 2024-05-07T08:40:37Z 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. Article in Journal/Newspaper EISCAT Svalbard University of Tromsø: Munin Open Research Archive Svalbard |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
ionosphere auroral ionosphere plasma waves and instabilities particle accelaration VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 |
spellingShingle |
ionosphere auroral ionosphere plasma waves and instabilities particle accelaration VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 Blixt, Erik Mårten Ivchenko, N. Hagfors, T. Grydeland, Tom Trondsen, T.S. La Hoz, Cesar Lanchester, B.S. Løvhaug, Unni Pia Dynamic rayed aurora and enhanced ion-acoustic radar echoes |
topic_facet |
ionosphere auroral ionosphere plasma waves and instabilities particle accelaration VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Blixt, Erik Mårten Ivchenko, N. Hagfors, T. Grydeland, Tom Trondsen, T.S. La Hoz, Cesar Lanchester, B.S. Løvhaug, Unni Pia |
author_facet |
Blixt, Erik Mårten Ivchenko, N. Hagfors, T. Grydeland, Tom Trondsen, T.S. La Hoz, Cesar Lanchester, B.S. Løvhaug, Unni Pia |
author_sort |
Blixt, Erik Mårten |
title |
Dynamic rayed aurora and enhanced ion-acoustic radar echoes |
title_short |
Dynamic rayed aurora and enhanced ion-acoustic radar echoes |
title_full |
Dynamic rayed aurora and enhanced ion-acoustic radar echoes |
title_fullStr |
Dynamic rayed aurora and enhanced ion-acoustic radar echoes |
title_full_unstemmed |
Dynamic rayed aurora and enhanced ion-acoustic radar echoes |
title_sort |
dynamic rayed aurora and enhanced ion-acoustic radar echoes |
publisher |
European Geosciences Union |
publishDate |
2005 |
url |
https://hdl.handle.net/10037/551 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_relation |
Annales Geophysicae 23(2005), pp 3-11 1432-0576 (elektronisk) https://hdl.handle.net/10037/551 URN:NBN:no-uit_munin_378 |
op_rights |
openAccess |
_version_ |
1800750855696154624 |