Generation of gravity waves within the ionosphere by transient heating during high-power wave propagation
01 Jul 1987-Astrophysics and Space Science (Kluwer Academic Publishers)-Vol. 135, Iss: 2, pp 325-334
TL;DR: In this article, the authors derived expressions for the low-frequency part of the fractional pressure variations in the E-region of the ionosphere under the stated perturbed condition may be considered to be manifested through Lorentzforce and Joule-dissipation that influence the neutral gas of the atmosphere via collision-mechanism and thereby gravity waves are launched.
Abstract: Generation of short-range gravity waves within the ionosphere due to inhomogenous heating in the presence of space-localized inhomogeneities during high-power radio wave-propagation has been investigated. The magnitude and from of the anticipated atmospheric wave-trains are obtained. The derived experession of electric field within the ionosphere under the stated perturbed condition may be considered to be manifested through Lorentz-force and Joule-dissipation that influence the neutral gas of the atmosphere via collision-mechanism and thereby gravity waves are launched. The expressions for the low-frequency part of the fractional pressure variations have been derived which are applied to theE-region of the ionosphere. The results are presented graphically.
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TL;DR: In this paper, the nonlinear heating of electrons in the ionospheric plasma due to high-power radio wave propagation was investigated through an integro-differential equation derived from Boltzmann velocity-moment equations.
Abstract: The non-linear heating of electrons in the ionospheric plasma due to high-power radio wave propagation has been investigated through an integro-differential equation derived from Boltzmann velocity-moment equations. Various processes appropriate to the situation under study are taken into account. The numerical solution of the derived equation is presented graphically.
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TL;DR: In this paper, a unique wave interaction experiment employing the Arecibo 2.0-MW, 430-MHz radar as disturbing or heating transmitter has been performed, where the heater beam used was much smaller in angular extent than the probing or wanted beam, yielding an unfavorable geometric weighting factor and making the experiment very sensitive to reflection properties of the E region.
Abstract: A unique wave interaction experiment employing the Arecibo 2.0-MW, 430-MHz radar as disturbing or heating transmitter has been performed. The purpose of this experiment was to evaluate UHF electron heating effects and to extend the wave interaction technique to higher than usual heights (˜100 km). The heater beam used was much smaller in angular extent than the probing or wanted beam, yielding an unfavorable geometric weighting factor and making the experiment very sensitive to reflection properties of the E region. Nonetheless, wave interaction was easily detected using a completely digital signal processing technique. Comparison of experimental wave interaction results with a numerical model of the process indicates that lower thermosphere electron cooling rates are possibly too small by a factor of 4. Power spectra of the 3.155 MHz wanted signal (reflected from E region) amplitude fluctuations for ‘quiet’ and ‘disturbed’ days are also given.
11 citations
TL;DR: The pulsed-wave interaction experiments similar to those first described by Fejer (1955) have been made at Armidale (lat. 30°32′S; long. 151°38′E) using gyro-waves during day time.
8 citations
TL;DR: In this article, the Boltzmann equation was used to study the variations of the first and second order cross modulations with various plasma parameters such as collision frequency, plasma frequency, and index of modulation.
Abstract: In this article expressions for the first and second order cross modulations (CM's) have been obtained when an amplitude-modulated electromagnetic wave (EMW) is reflected from the magneto-plasma free space interface in the presence of an external magnetic field at gyroresonance by the rigorous kinetic approach (Boltzmann equation). The expressions thus obtained have been used to study the variations of the first and second order CM's with various plasma parameters such as collision frequency, plasma frequency, and index of modulation.
3 citations