Abstract
Dynamics of Langmuir solitons is considered in plasmas with spatially inhomogeneous electron temperature. An underlying Zakharov-type system of two unidirectional equations for the Langmuir and ion-sound fields is reduced to an inhomogeneous nonlinear Schrödinger equation with spatial variation of the second-order dispersion and self-phase modulation coefficients, induced by a spatially inhomogeneous profile of the electron temperature. Analytical trajectories of motion of a soliton in the plasma with an electron-temperature hole, barrier, or cavity between two barriers are found, using the method of integral moments. The possibility of the soliton to pass a high-temperature barrier is shown too. Analytical results are well corroborated by numerical simulations.
Original language | English |
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Article number | 068021 |
Journal | Physica Scripta |
Volume | 90 |
Issue number | 6 |
DOIs |
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State | Published - 1 Jun 2015 |
Keywords
- Zakharov system
- method of moments
- nonlinear Schrödinger equation
- soliton