An optical study of multiple NEIAL events driven by low energy electron precipitation
An optical study of multiple NEIAL events driven by low energy electron precipitation
Optical data are compared with EISCAT radar observations of multiple Naturally Enhanced Ion-Acoustic Line (NEIAL) events in the dayside cusp. This study uses narrow field of view cameras to observe small-scale, short-lived auroral features. Using multiple-wavelength optical observations, a direct link between NEIAL occurrences and low energy (about 100 eV) optical emissions is shown. This is consistent with the Langmuir wave decay interpretation of NEIALs being driven by streams of low-energy electrons.
Modelling work connected with this study shows that, for the measured ionospheric conditions and precipitation characteristics, growth of unstable Langmuir (electron plasma) waves can occur, which decay into ion-acoustic wave modes. The link with low energy optical emissions shown here, will enable future studies of the shape, extent, lifetime, grouping and motions of NEIALs.
ionosphere, auroral ionosphere, plasma wavesand instabilities, space plasma physics, wave-wave interactions
2435-2447
Sullivan, J.M.
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Lockwood, Michael
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Lanchester, Betty S.
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Kontar, E.P.
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Ivchenko, N.
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Dahlgren, H.
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Whiter, D.K.
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2008
Sullivan, J.M.
dad3c07d-a1ac-47ad-8b41-f603c85b4680
Lockwood, Michael
a53d2166-6d02-4b6e-a9df-38afd8fdb837
Lanchester, Betty S.
e864533e-eea0-471f-a3f9-7c70c25be55b
Kontar, E.P.
1b30450a-a66e-4bb2-a8c5-88ccbfcfc503
Ivchenko, N.
c892df9e-e2a0-450f-bf77-2673e029f565
Dahlgren, H.
8d021086-b328-46fd-affd-a7c8d2b4687e
Whiter, D.K.
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Sullivan, J.M., Lockwood, Michael, Lanchester, Betty S., Kontar, E.P., Ivchenko, N., Dahlgren, H. and Whiter, D.K.
(2008)
An optical study of multiple NEIAL events driven by low energy electron precipitation.
Annales Geophysicae, 26 (8), .
Abstract
Optical data are compared with EISCAT radar observations of multiple Naturally Enhanced Ion-Acoustic Line (NEIAL) events in the dayside cusp. This study uses narrow field of view cameras to observe small-scale, short-lived auroral features. Using multiple-wavelength optical observations, a direct link between NEIAL occurrences and low energy (about 100 eV) optical emissions is shown. This is consistent with the Langmuir wave decay interpretation of NEIALs being driven by streams of low-energy electrons.
Modelling work connected with this study shows that, for the measured ionospheric conditions and precipitation characteristics, growth of unstable Langmuir (electron plasma) waves can occur, which decay into ion-acoustic wave modes. The link with low energy optical emissions shown here, will enable future studies of the shape, extent, lifetime, grouping and motions of NEIALs.
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Published date: 2008
Keywords:
ionosphere, auroral ionosphere, plasma wavesand instabilities, space plasma physics, wave-wave interactions
Identifiers
Local EPrints ID: 146811
URI: http://eprints.soton.ac.uk/id/eprint/146811
ISSN: 0992-7689
PURE UUID: ab60af13-9cd4-430d-8e11-3d411170c269
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Date deposited: 22 Apr 2010 14:08
Last modified: 18 Jan 2022 02:40
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Contributors
Author:
J.M. Sullivan
Author:
Michael Lockwood
Author:
Betty S. Lanchester
Author:
E.P. Kontar
Author:
N. Ivchenko
Author:
H. Dahlgren
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