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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ftcopernicus:oai:publications.copernicus.org:angeo36501 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. 2018-09-27 application/pdf https://doi.org/10.5194/angeo-26-2435-2008 https://angeo.copernicus.org/articles/26/2435/2008/ eng eng doi:10.5194/angeo-26-2435-2008 https://angeo.copernicus.org/articles/26/2435/2008/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.5194/angeo-26-2435-2008 2020-07-20T16:26:51Z 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. Text EISCAT Copernicus Publications: E-Journals Langmuir ENVELOPE(-67.150,-67.150,-66.967,-66.967) Annales Geophysicae 26 8 2435 2447 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
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 |
Text |
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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/angeo-26-2435-2008 https://angeo.copernicus.org/articles/26/2435/2008/ |
long_lat |
ENVELOPE(-67.150,-67.150,-66.967,-66.967) |
geographic |
Langmuir |
geographic_facet |
Langmuir |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.5194/angeo-26-2435-2008 https://angeo.copernicus.org/articles/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 |
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1766400263805992960 |