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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
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 waves and instabilities, space plasma physics, wave-wave interactions
0992-7689
2435-2447
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.
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), 2435-2447.

Record type: Article

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.

Full text not available from this repository.

More information

Published date: 2008
Keywords: ionosphere, auroral ionosphere, plasma waves and 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
ORCID for D.K. Whiter: ORCID iD orcid.org/0000-0001-7130-232X

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Date deposited: 22 Apr 2010 14:08
Last modified: 20 Jul 2019 00:50

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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
Author: D.K. Whiter ORCID iD

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