Accessibility navigation


An optical study of multiple NEIAL events driven by low energy electron precipitation

Downloads

Downloads per month over past year

Sullivan, J.M., Lockwood, M., Lanchester, B.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. pp. 2435-2447. ISSN 0992-7689

[img] Text - Published Version
· Please see our End User Agreement before downloading.

2396Kb

To link to this article DOI: 10.5194/angeo-26-2435-2008

Abstract/Summary

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.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > Department of Meteorology
No Reading authors. Back catalogue items
ID Code:7509
Publisher:Copernicus Publications

Download Statistics for this item.

Centaur Editors: Update this record

Page navigation