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Dynamic rayed aurora and enhanced ion-acoustic radar echoes

Dynamic rayed aurora and enhanced ion-acoustic radar echoes
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 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.
0992-7689
1-9
Blixt, E.M.
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Grydeland, T.
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Ivchenko, N.
c892df9e-e2a0-450f-bf77-2673e029f565
Hagfors, T.
91862c74-2d6d-4d25-b7f2-eeb45ee3b049
La Hoz, C.
539ee6ae-9f57-4fa4-996a-367c398f3794
Lanchester, B.S.
3df6baff-ddae-4a6a-9815-0f60f7e7abba
Lauvhaug, U.P.
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Trondsen, T.S.
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Blixt, E.M.
0d121cc5-5d9a-4505-a775-10db7594a48f
Grydeland, T.
0092d705-dffa-4d9d-8696-6635bd920282
Ivchenko, N.
c892df9e-e2a0-450f-bf77-2673e029f565
Hagfors, T.
91862c74-2d6d-4d25-b7f2-eeb45ee3b049
La Hoz, C.
539ee6ae-9f57-4fa4-996a-367c398f3794
Lanchester, B.S.
3df6baff-ddae-4a6a-9815-0f60f7e7abba
Lauvhaug, U.P.
e602da22-3e58-4fc4-9aae-46c4e39b2a8d
Trondsen, T.S.
17ae1ae8-2a9e-428f-a9fc-1c30e67a4b5c

Blixt, E.M., Grydeland, T., Ivchenko, N., Hagfors, T., La Hoz, C., Lanchester, B.S., Lauvhaug, U.P. and Trondsen, T.S. (2005) Dynamic rayed aurora and enhanced ion-acoustic radar echoes. Annales Geophysicae, 23 (1), 1-9. (doi:10.5194/angeo-23-3-2005).

Record type: Article

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 (10-100eV) 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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angeo-23-3-2005 - Version of Record
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Submitted date: 2004
Published date: 31 January 2005
Additional Information: Paper presented at 11th EISCAT International RADAR workshop, 2004

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Local EPrints ID: 9120
URI: https://eprints.soton.ac.uk/id/eprint/9120
ISSN: 0992-7689
PURE UUID: a2ba72bf-17b5-4e2c-b602-16a740a15403

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Date deposited: 30 Sep 2004
Last modified: 08 Jan 2019 17:31

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Contributors

Author: E.M. Blixt
Author: T. Grydeland
Author: N. Ivchenko
Author: T. Hagfors
Author: C. La Hoz
Author: B.S. Lanchester
Author: U.P. Lauvhaug
Author: T.S. Trondsen

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