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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... Full description

Journal Title: Annales Geophysicae 2005, Vol.23 (1), p.3-11
Main Author: BLIXT, E. M
Other Authors: GRYDELAND, T , IVCHENKO, N , HAGFORS, T , LA HOZ, C , LANCHESTER, B. S , LØVHAUG, U. P , TRONDSEN, T. S
Format: Electronic Article Electronic Article
Language: English
Subjects:
Rom
Publisher: Katlenburg-Lindau: European Geophysical Society
ID: ISSN: 0992-7689
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title: Dynamic rayed aurora and enhanced ion-acoustic radar echoes
format: Article
creator:
  • BLIXT, E. M
  • GRYDELAND, T
  • IVCHENKO, N
  • HAGFORS, T
  • LA HOZ, C
  • LANCHESTER, B. S
  • LØVHAUG, U. P
  • TRONDSEN, T. S
subjects:
  • Atmosphere
  • auroral ionosphere
  • Cosmic physics
  • Earth Sciences
  • Earth, ocean, space
  • eiscat uhf
  • Exact sciences and technology
  • External geophysics
  • fluctuations
  • Fysik
  • Fysikk
  • Geophysics
  • instabilities
  • ionosphere
  • Matematikk og Naturvitenskap
  • Natural Sciences
  • Naturvetenskap
  • Ocean
  • Ocean, Atmosphere
  • og plasmafysikk
  • particle accelaration
  • particle acceleration
  • Physical Sciences
  • Physics
  • Physics of the high neutral atmosphere
  • Physics of the ionosphere
  • Physics of the magnetosphere
  • plasma waves
  • plasma waves and instabilities
  • Radar systems
  • Rom
  • Science
  • Sciences of the Universe
  • svalbard
  • system
ispartof: Annales Geophysicae, 2005, Vol.23 (1), p.3-11
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 (10-100eV) 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.
language: eng
source:
identifier: ISSN: 0992-7689
fulltext: no_fulltext
issn:
  • 0992-7689
  • 1432-0576
  • 1432-0576
url: Link


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titleDynamic rayed aurora and enhanced ion-acoustic radar echoes
creatorBLIXT, E. M ; GRYDELAND, T ; IVCHENKO, N ; HAGFORS, T ; LA HOZ, C ; LANCHESTER, B. S ; LØVHAUG, U. P ; TRONDSEN, T. S
creatorcontribBLIXT, E. M ; GRYDELAND, T ; IVCHENKO, N ; HAGFORS, T ; LA HOZ, C ; LANCHESTER, B. S ; LØVHAUG, U. P ; TRONDSEN, T. S
descriptionThe 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.
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languageeng
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subjectAtmosphere ; auroral ionosphere ; Cosmic physics ; Earth Sciences ; Earth, ocean, space ; eiscat uhf ; Exact sciences and technology ; External geophysics ; fluctuations ; Fysik ; Fysikk ; Geophysics ; instabilities ; ionosphere ; Matematikk og Naturvitenskap ; Natural Sciences ; Naturvetenskap ; Ocean ; Ocean, Atmosphere ; og plasmafysikk ; particle accelaration ; particle acceleration ; Physical Sciences ; Physics ; Physics of the high neutral atmosphere ; Physics of the ionosphere ; Physics of the magnetosphere ; plasma waves ; plasma waves and instabilities ; Radar systems ; Rom ; Science ; Sciences of the Universe ; svalbard ; system
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7TRONDSEN, T. S
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descriptionThe 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.
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2Cosmic physics
3Earth Sciences
4Earth, ocean, space
5eiscat uhf
6Exact sciences and technology
7External geophysics
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9Fysik
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abstractThe 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.
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