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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union

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Nonlin. Processes Geophys., 10, 151-177, 2003
© Author(s) 2003. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
30 Apr 2003
Geometric aspects of HF driven Langmuir turbulence in the ionosphere
E. Mjølhus1, E. Helmersen2, and D. F. DuBois3 1University of Tromsø, Faculty of Science, Department of Mathematics and Statistics, N-9037 Tromsø, Norway
2Poseidon Simulation AS, N-8376 Leknes, Norway
3Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Abstract. The geometric aspects of HF-generated Langmuir turbulence in the ionosphere and its detection by radars are theoretically discussed in a broad approach, including local modelling (damped and driven Zakharov system), basic parametric instabilities, polarization and strength of the driving electric field, and radar configurations. Selected examples of numerical results from the local model are presented and discussed in relation to recent experiments, with emphasis on recent experiments at the EISCAT facilities. Anisotropic aspects of the cavitation process in the magnetized plasma are exhibited. Basic processes of cascades and cavitation are by now well identified in these experiments, but a few problems of the detailed agreement between theory and experiments are pointed out.

Citation: Mjølhus, E., Helmersen, E., and DuBois, D. F.: Geometric aspects of HF driven Langmuir turbulence in the ionosphere, Nonlin. Processes Geophys., 10, 151-177,, 2003.
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