期刊
ADVANCES IN SPACE RESEARCH
卷 49, 期 12, 页码 1721-1727出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.asr.2012.02.018
关键词
Ion-acoustic waves; Riemann-Liouville fractional derivative; Fractional KdV equation; He's variational-iteration method
Collisionless unmagnetized plasma consisting of a mixture of warm ion-fluid and isothermal-electron is considered, assuming that the ion flow velocity has a weak relativistic effect. The reductive perturbation method has been employed to derive the Korteweg-de Vries (KdV) equation for small - but finite-amplitude electrostatic ion-acoustic waves in this plasma. The semi-inverse method and Agrawal's method lead to the Euler-Lagrange equation that leads to the time fractional KdV equation. The variational-iteration method given by He is used to solve the derived time fractional KdV equation. The calculations show that the fractional order may play the same rule of higher order dissipation in KdV equation to modulate the soliton wave amplitude in the plasma system. The results of the present investigation may be applicable to some plasma environments, such as space-plasmas, laser-plasma interaction, plasma sheet boundary layer of the earth's magnetosphere, solar atmosphere and interplanetary space. (C) 2012 COSPA R. Published by Elsevier Ltd. All rights reserved.
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