Dynamic rayed aurora and enhanced ion-acoustic radar echoes
International audience 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...
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ftccsdartic:oai:HAL:hal-00317476v1 2023-05-15T16:04:46+02:00 Dynamic rayed aurora and enhanced ion-acoustic radar echoes Blixt, E. M. Grydeland, T. Ivchenko, N. Hagfors, T. La Hoz, C. Lanchester, B. S. Løvhaug, U. P. Trondsen, T. S. Dept. of Physics University of Tromsø (UiT) School of Physics and Astronomy Nottingham University of Nottingham, UK (UON) Alfven Laboratory Royal Institute of Technology Stockholm (KTH ) Max-Planck-Institut für Aeronomie (MPI Aeronomie) Max-Planck-Gesellschaft Cornell University New York Institute for Space Research Calgary University of Calgary 2005-01-31 https://hal.archives-ouvertes.fr/hal-00317476 https://hal.archives-ouvertes.fr/hal-00317476/document https://hal.archives-ouvertes.fr/hal-00317476/file/angeo-23-3-2005.pdf en eng HAL CCSD European Geosciences Union hal-00317476 https://hal.archives-ouvertes.fr/hal-00317476 https://hal.archives-ouvertes.fr/hal-00317476/document https://hal.archives-ouvertes.fr/hal-00317476/file/angeo-23-3-2005.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.archives-ouvertes.fr/hal-00317476 Annales Geophysicae, European Geosciences Union, 2005, 23 (1), pp.3-11 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2005 ftccsdartic 2021-06-13T00:24:28Z International audience 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 (10-100eV) 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 7km 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 Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Svalbard |
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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Blixt, E. M. Grydeland, T. Ivchenko, N. Hagfors, T. La Hoz, C. Lanchester, B. S. Løvhaug, U. P. Trondsen, T. S. Dynamic rayed aurora and enhanced ion-acoustic radar echoes |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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 (10-100eV) 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 7km 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. |
author2 |
Dept. of Physics University of Tromsø (UiT) School of Physics and Astronomy Nottingham University of Nottingham, UK (UON) Alfven Laboratory Royal Institute of Technology Stockholm (KTH ) Max-Planck-Institut für Aeronomie (MPI Aeronomie) Max-Planck-Gesellschaft Cornell University New York Institute for Space Research Calgary University of Calgary |
format |
Article in Journal/Newspaper |
author |
Blixt, E. M. Grydeland, T. Ivchenko, N. Hagfors, T. La Hoz, C. Lanchester, B. S. Løvhaug, U. P. Trondsen, T. S. |
author_facet |
Blixt, E. M. Grydeland, T. Ivchenko, N. Hagfors, T. La Hoz, C. Lanchester, B. S. Løvhaug, U. P. Trondsen, T. S. |
author_sort |
Blixt, E. M. |
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 |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.archives-ouvertes.fr/hal-00317476 https://hal.archives-ouvertes.fr/hal-00317476/document https://hal.archives-ouvertes.fr/hal-00317476/file/angeo-23-3-2005.pdf |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.archives-ouvertes.fr/hal-00317476 Annales Geophysicae, European Geosciences Union, 2005, 23 (1), pp.3-11 |
op_relation |
hal-00317476 https://hal.archives-ouvertes.fr/hal-00317476 https://hal.archives-ouvertes.fr/hal-00317476/document https://hal.archives-ouvertes.fr/hal-00317476/file/angeo-23-3-2005.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766400395465195520 |