Nonlinear wave interactions as a model for naturally enhanced ion acoustic lines in the ionosphere

Kontar, E.P. and Pécseli, H.L. (2005) Nonlinear wave interactions as a model for naturally enhanced ion acoustic lines in the ionosphere. Geophysical Research Letters, 32(L05110), (doi:10.1029/2004GL022182)

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Abstract

Incoherent radar scatter from the ionosphere will, for equilibrium conditions, show two symmetric ion-acoustic lines, one for each direction of wave propagation. Many observations, from the EISCAT Svalbard Radar (ESR) for instance, demonstrate that the symmetry of this ion line can be broken. An enhanced, nonthermal, level of fluctuations, i.e., Naturally Enhanced Ion-Acoustic Lines (NEIALs) might be observed. Several models have been proposed for explaining these naturally enhanced lines. Here, we consider one of these, suggesting that decay of electron beam excited Langmuir waves gives rise to enhanced asymmetric ion lines in the ionosphere. We use a weak-turbulence approximation, and identify crucial parameters for Langmuir decay processes to be effective in generating the observed signals.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kontar, Professor Eduard
Authors: Kontar, E.P., and Pécseli, H.L.
Subjects:Q Science > QB Astronomy
Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Geophysical Research Letters
ISSN:0094-8276
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