Growth of a spike on a Gaussian radio wave in the lower ionosphere

Details Growth of a spike on a Gaussian radio wave in the lower ionosphere Growth of a spike on a Gaussian radio wave in the lower ionosphere

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.6167p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A4, p. 6167-6172

Physics

Geophysics

Earth Ionosphere, Plasma Diffusion, Plasma Heating, Plasma Oscillations, Radio Waves, Wave Propagation, Collisional Plasmas, Electron Density (Concentration), Geophysics, Plasma Dynamics

Scientific paper

A Gaussian radio wave, propagating through the ionosphere causes differential ohmic heating of electrons and subsequent quasi-linear diffusion of the plasma. The plasma duct thus formed tends to self-focus the radio wave. When the radio wave has an on-axis spike in its intensity distribution, it causes stronger local density depression and attracts more electromagnetic energy from the neighborhood, enhancing the spike. The self-focusing of the radio wave and the growth of the perturbation are coupled through the nonlinear permitivity. For RF powers corresponding to v(sub o) approximately c(sub s) the optimum radius of the fastest growing perturbation is approximately 3c/omega (sub po) and the amplification length is approximately 10 c omega/omega (sub po)(exp 2), where v(sub o) is the amplitude of electron oscillatory velocity, cs is the sound speed, omega is the frequency of the radio wave, and omega (sub po) is the plasma frequency.

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