TY - JOUR
T1 - Full-scale simulation study of stimulated electromagnetic emissions
T2 - the first ten milliseconds
AU - Eliasson, Bengt
AU - Stenflo, Lennart
PY - 2010/1/15
Y1 - 2010/1/15
N2 - 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.
AB - 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.
KW - ionospheric heating
KW - numerical simulation
KW - stimulated emissions
UR - http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=7645820
U2 - 10.1017/S0022377809990559
DO - 10.1017/S0022377809990559
M3 - Article
VL - 76
SP - 369
EP - 375
JO - Journal of Plasma Physics
JF - Journal of Plasma Physics
SN - 0022-3778
IS - 3-4
ER -