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. and Whiter, D.K. (2008) An optical study of multiple NEIAL events driven by low energy electron precipitation. Annales Geophysicae, 26, (8), 2435-2447.
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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.
|Keywords:||ionosphere, auroral ionosphere, plasma waves and instabilities, space plasma physics, wave-wave interactions|
|Divisions:||University Structure - Pre August 2011 > School of Physics and Astronomy > Astronomy and Space Science
|Date Deposited:||22 Apr 2010 14:08|
|Last Modified:||22 Aug 2012 02:59|
|Contributors:||Sullivan, J.M. (Author)
Lockwood, Michael (Author)
Lanchester, Betty S. (Author)
Kontar, E.P. (Author)
Ivchenko, N. (Author)
Dahlgren, H. (Author)
Whiter, D.K. (Author)
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