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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ftdoajarticles:oai:doaj.org/article:d99afe86d83e42e1829c852d08c78052 2023-05-15T16:04:40+02:00 An optical study of multiple NEIAL events driven by low energy electron precipitation J. M. Sullivan M. Lockwood B. S. Lanchester E. P. Kontar N. Ivchenko H. Dahlgren D. K. Whiter 2008-08-01T00:00:00Z https://doi.org/10.5194/angeo-26-2435-2008 https://doaj.org/article/d99afe86d83e42e1829c852d08c78052 EN eng Copernicus Publications https://www.ann-geophys.net/26/2435/2008/angeo-26-2435-2008.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-26-2435-2008 0992-7689 1432-0576 https://doaj.org/article/d99afe86d83e42e1829c852d08c78052 Annales Geophysicae, Vol 26, Pp 2435-2447 (2008) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2008 ftdoajarticles https://doi.org/10.5194/angeo-26-2435-2008 2022-12-31T13:57:07Z 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 Directory of Open Access Journals: DOAJ Articles Langmuir ENVELOPE(-67.150,-67.150,-66.967,-66.967) Annales Geophysicae 26 8 2435 2447 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 J. M. Sullivan M. Lockwood B. S. Lanchester E. P. Kontar N. Ivchenko H. Dahlgren D. K. Whiter An optical study of multiple NEIAL events driven by low energy electron precipitation |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
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 |
J. M. Sullivan M. Lockwood B. S. Lanchester E. P. Kontar N. Ivchenko H. Dahlgren D. K. Whiter |
author_facet |
J. M. Sullivan M. Lockwood B. S. Lanchester E. P. Kontar N. Ivchenko H. Dahlgren D. K. Whiter |
author_sort |
J. M. Sullivan |
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 |
Copernicus Publications |
publishDate |
2008 |
url |
https://doi.org/10.5194/angeo-26-2435-2008 https://doaj.org/article/d99afe86d83e42e1829c852d08c78052 |
long_lat |
ENVELOPE(-67.150,-67.150,-66.967,-66.967) |
geographic |
Langmuir |
geographic_facet |
Langmuir |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
Annales Geophysicae, Vol 26, Pp 2435-2447 (2008) |
op_relation |
https://www.ann-geophys.net/26/2435/2008/angeo-26-2435-2008.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-26-2435-2008 0992-7689 1432-0576 https://doaj.org/article/d99afe86d83e42e1829c852d08c78052 |
op_doi |
https://doi.org/10.5194/angeo-26-2435-2008 |
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Annales Geophysicae |
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26 |
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8 |
container_start_page |
2435 |
op_container_end_page |
2447 |
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1766400285130883072 |