Articles | Volume 10, issue 1/2
Nonlin. Processes Geophys., 10, 151–177, 2003
https://doi.org/10.5194/npg-10-151-2003

Special issue: 4th International Workshop on Nonlinear Waves and Chaos in...

Nonlin. Processes Geophys., 10, 151–177, 2003
https://doi.org/10.5194/npg-10-151-2003

  30 Apr 2003

30 Apr 2003

Geometric aspects of HF driven Langmuir turbulence in the ionosphere

E. Mjølhus1, E. Helmersen2, and D. F. DuBois3 E. Mjølhus et al.
  • 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.