Langmuir solitons in a plasma with inhomogeneous electron temperature. (21st May 2015)

• Record Type: Journal Article
• Authors: Gromov, Evgeny M; Malomed, Boris A
• Is Part Of: Physica scripta. Volume 90:Number 6(2015:Jun.)
• Publication Date: 2015-05-21
• Subjects: Zakharov system -- nonlinear Schrödinger equation -- soliton -- method of moments; 52.35.Sb-solitons; Physics -- Periodicals; 530.05
• DOI: 10.1088/0031-8949/90/6/068021
• Languages: English
• ISSNs: 0031-8949

Abstract

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.