The generation of 150 km echoes through nonlinear wave mode coupling
William J Longley
Abstract:A fundamental problem in turbulence is understanding how energy cascades
across multiple scales. In this paper, a new weak turbulence theory is
developed to explain how energy can be transferred from Langmuir and
Upper-Hybrid waves (~10 MHz frequencies, 20-cm
wavelengths) to ion-acoustic waves (~kHz frequencies,
3-meter wavelengths). A kinetic approach is used where the electrostatic
Boltzmann equations are Fourier-Laplace transformed, and the nonlinear
term is retained. A unique feature of this approach is th… Show more
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