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...
Published in: | Annales Geophysicae |
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ftuglasgow:oai:eprints.gla.ac.uk:32426 2023-05-15T16:04:39+02:00 An optical study of multiple NEIAL events driven by low energy electron precipitation Sullivan, J.M. Lockwood, M. Lanchester, B.S. Kontar, E.P. Ivchenko, N. Dahlgren, H. Whiter, D.K. 2008 http://eprints.gla.ac.uk/32426/ unknown European Geosciences Union Sullivan, J.M., Lockwood, M., Lanchester, B.S., Kontar, E.P. <http://eprints.gla.ac.uk/view/author/4680.html> , Ivchenko, N., Dahlgren, H. and Whiter, D.K. (2008) An optical study of multiple NEIAL events driven by low energy electron precipitation. Annales Geophysicae <http://eprints.gla.ac.uk/view/journal_volume/Annales_Geophysicae.html>, 26(8), pp. 2435-2447. (doi:10.5194/angeo-26-2435-2008 <http://dx.doi.org/10.5194/angeo-26-2435-2008>) Articles PeerReviewed 2008 ftuglasgow https://doi.org/10.5194/angeo-26-2435-2008 2021-09-23T22:17:24Z 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 Glasgow: Enlighten - Publications Langmuir ENVELOPE(-67.150,-67.150,-66.967,-66.967) Annales Geophysicae 26 8 2435 2447 |
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University of Glasgow: Enlighten - Publications |
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ftuglasgow |
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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, M. Lanchester, B.S. Kontar, E.P. Ivchenko, N. Dahlgren, H. Whiter, D.K. |
spellingShingle |
Sullivan, J.M. Lockwood, M. Lanchester, B.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, M. Lanchester, B.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 |
publisher |
European Geosciences Union |
publishDate |
2008 |
url |
http://eprints.gla.ac.uk/32426/ |
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, M., Lanchester, B.S., Kontar, E.P. <http://eprints.gla.ac.uk/view/author/4680.html> , Ivchenko, N., Dahlgren, H. and Whiter, D.K. (2008) An optical study of multiple NEIAL events driven by low energy electron precipitation. Annales Geophysicae <http://eprints.gla.ac.uk/view/journal_volume/Annales_Geophysicae.html>, 26(8), pp. 2435-2447. (doi:10.5194/angeo-26-2435-2008 <http://dx.doi.org/10.5194/angeo-26-2435-2008>) |
op_doi |
https://doi.org/10.5194/angeo-26-2435-2008 |
container_title |
Annales Geophysicae |
container_volume |
26 |
container_issue |
8 |
container_start_page |
2435 |
op_container_end_page |
2447 |
_version_ |
1766400268854886400 |