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| Titel |
An optical study of multiple NEIAL events driven by low energy electron precipitation |
| VerfasserIn |
J. M. Sullivan, M. Lockwood, B. S. Lanchester, E. P. Kontar, N. Ivchenko, H. Dahlgren, D. K. Whiter |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 26, no. 8 ; Nr. 26, no. 8 (2008-08-11), S.2435-2447 |
| Datensatznummer |
250016201
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| Publikation (Nr.) |
 copernicus.org/angeo-26-2435-2008.pdf |
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| Zusammenfassung |
| 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. |
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