Longitudinal propagation of low‐frequency waves in a switched magnetoplasma medium

Madala, S.R.V.; Kalluri, Dikshitulu K.

doi:10.1029/92rs02453

Cited by 9 publications

(1 citation statement)

References 11 publications

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“…Frequency upshifting using time-varying magnetoplasmas has been investigated [1][2][3][4][5][6] recently. In all these cases the electron density profile was a monotonically increasing function of time.…”

Section: Introductionmentioning

confidence: 99%

Frequency upshifting with power intensification of a whistler wave by a collapsing plasma medium

Kalluri

1996

Journal of Applied Physics

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A source wave is assumed to be present in an unbounded magnetoplasma medium. The parameters are such that the refractive index is greater than one. A wave propagating in the ''whistler mode'' is an example of such a wave. By collapsing the ionization, it is possible to obtain a frequency upshifted wave with power intensification. Two limiting cases of ͑i͒ sudden collapse and ͑ii͒ slow decay are considered. In either case, it is shown that the final upshifted frequency is the source frequency multiplied by the refractive index. When the source frequency is much less than electron gyrofrequency the refractive index n w is quite large and the electric field is intensified by a factor of n w /2 for the case of sudden collapse and by a factor of n w /& for the case of slow decay. The corresponding intensification factors for the power density are n w /4 and n w /2. A physical explanation of the results, based on energy balance, is offered.

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Section: Introductionmentioning

confidence: 99%

Frequency upshifting with power intensification of a whistler wave by a collapsing plasma medium

Kalluri

1996

Journal of Applied Physics

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Nonlinear transformation of electromagnetic waves in suddenly created cold magnetized plasma: Longitudinal propagation

Trifkovic

Stanić

2002

Journal of Applied Physics

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The transformation of a circularly polarized electromagnetic source wave in a suddenly created cold magnetized and weakly nonlinear plasma is considered. For the case of longitudinal propagation (a source wave propagating along an external static magnetic field) when the ion motion is neglected, a circularly polarized source wave splits into four longitudinal oscillating modes. In the case of a linearly polarized source wave due to the interaction between its right and left circularly polarized components additional stationary and traveling electron wave modes are created. Amplitude distributions of all created modes are determined in closed form and presented in corresponding diagrams for different values of source wave and electron cyclotron frequencies.

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Energetics of electromagnetic wave transformation in a time-varying magnetoplasma medium

Бакунов¹,

Grachev²

2002

Phys. Rev. E

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The transformation of a circularly polarized electromagnetic wave in a magnetoplasma medium with increasing plasma density is considered. The wave propagates along the static magnetic field. Complete analysis, including ion motion, is given both for slow (compared to the wave frequency) and rapid ionization rate. In the case of slow temporal variation of the plasma density, a relation between the energy of the wave and its frequency, which is conserved during the plasma creation process (adiabatic invariant), is found. The existence of significant energy losses follows from the invariant. The dissipative mechanism is explained via consideration of the case of a sudden growth of plasma density in time from one value to another. It is shown that energy transforms into the kinetic energy of carriers, and preionization of the medium plays a principal role in the dissipation process. In the special case of a whistler wave, up to 50% of the energy may be transformed into an ion-cyclotron wave when dense plasma is rapidly created.

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Longitudinal propagation of low‐frequency waves in a switched magnetoplasma medium

Cited by 9 publications

References 11 publications

Frequency upshifting with power intensification of a whistler wave by a collapsing plasma medium

Frequency upshifting with power intensification of a whistler wave by a collapsing plasma medium

Nonlinear transformation of electromagnetic waves in suddenly created cold magnetized plasma: Longitudinal propagation

Energetics of electromagnetic wave transformation in a time-varying magnetoplasma medium

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