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 li...
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ftsouthampton:oai:eprints.soton.ac.uk:146811 2023-07-30T04:03:16+02:00 An optical study of multiple NEIAL events driven by low energy electron precipitation Sullivan, J.M. Lockwood, Michael Lanchester, Betty S. Kontar, E.P. Ivchenko, N. Dahlgren, H. Whiter, D.K. 2008 https://eprints.soton.ac.uk/146811/ http://www.ann-geophys.net/26/2435/2008/angeo-26-2435-2008.html unknown 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. Article PeerReviewed 2008 ftsouthampton 2023-07-09T21:15:16Z 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. Article in Journal/Newspaper EISCAT University of Southampton: e-Prints Soton Langmuir ENVELOPE(-67.150,-67.150,-66.967,-66.967) |
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Open Polar |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
unknown |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Sullivan, J.M. Lockwood, Michael Lanchester, Betty S. Kontar, E.P. Ivchenko, N. Dahlgren, H. Whiter, D.K. |
spellingShingle |
Sullivan, J.M. Lockwood, Michael Lanchester, Betty S. Kontar, E.P. Ivchenko, N. Dahlgren, H. Whiter, D.K. An optical study of multiple NEIAL events driven by low energy electron precipitation |
author_facet |
Sullivan, J.M. Lockwood, Michael Lanchester, Betty S. Kontar, E.P. Ivchenko, N. Dahlgren, H. Whiter, D.K. |
author_sort |
Sullivan, J.M. |
title |
An optical study of multiple NEIAL events driven by low energy electron precipitation |
title_short |
An optical study of multiple NEIAL events driven by low energy electron precipitation |
title_full |
An optical study of multiple NEIAL events driven by low energy electron precipitation |
title_fullStr |
An optical study of multiple NEIAL events driven by low energy electron precipitation |
title_full_unstemmed |
An optical study of multiple NEIAL events driven by low energy electron precipitation |
title_sort |
optical study of multiple neial events driven by low energy electron precipitation |
publishDate |
2008 |
url |
https://eprints.soton.ac.uk/146811/ http://www.ann-geophys.net/26/2435/2008/angeo-26-2435-2008.html |
long_lat |
ENVELOPE(-67.150,-67.150,-66.967,-66.967) |
geographic |
Langmuir |
geographic_facet |
Langmuir |
genre |
EISCAT |
genre_facet |
EISCAT |
op_relation |
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. |
_version_ |
1772814237188489216 |