Simulations of ionospheric turbulence produced by HF heating near the upper hybrid layer

A. Najmi, B. Eliasson, X. Shao, G. Milikh, K. Papadopoulos

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Abstract

Heating of the ionosphere by high-frequency (HF), ordinary (O) mode electromagnetic waves can excite magnetic field aligned density striations (FAS), associated with upper and lower hybrid turbulence and electron heating. We have used Vlasov simulations in one spatial and two velocity dimensions to study the induced turbulence in the presence of striations when the O-mode pump is mode converted to large amplitude upper hybrid oscillations trapped in a striation. Parametric processes give rise to upper and lower hybrid turbulence, as well as to large amplitude, short wavelength electron Bernstein waves. The latter excite stochastic electron heating when their amplitudes exceed a threshold for stochasticity, leading to a rapid increase of the electron temperature by several thousands of Kelvin. The results have relevance for high latitude heating experiments.
Original languageEnglish
Pages (from-to)704-717
Number of pages13
JournalRadio Science
Volume51
Issue number6
Early online date29 May 2016
DOIs
Publication statusPublished - 22 Jun 2016

Keywords

  • ionospheric turbulence
  • upper hybrid waves
  • stochastic heating

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