Full-scale simulation study of stimulated electromagnetic emissions: the first ten milliseconds

Bengt Eliasson, Lennart Stenflo

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A full-scale numerical study is performed of the nonlinear interaction between a large-amplitude electromagnetic wave and the Earth's ionosphere, and of the stimulated electromagnetic emission emerging from the turbulent layer, during the first 10 milliseconds after switch-on of the radio transmitter. The frequency spectra are downshifted in frequency and appear to emerge from a region somewhat below the cutoff of the O mode, which is characterized by Langmuir wave turbulence and localized Langmuir envelopes trapped in ion density cavities. The spectral features of escaping O-mode waves are very similar to those observed in experiments. The frequency components of Z-mode waves, trapped in the region between the O- and Z-mode cutoffs show strongly asymmetric and downshifted spectra.
Original languageEnglish
Pages (from-to)369-375
Number of pages7
JournalJournal of Plasma Physics
Volume76
Issue number3-4
DOIs
Publication statusPublished - 15 Jan 2010

Keywords

  • ionospheric heating
  • numerical simulation
  • stimulated emissions

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