Landau damping of dust acoustic solitary waves in nonthermal plasmas

Ghai, Yashika and Saini, N. S. and Eliasson, B. (2018) Landau damping of dust acoustic solitary waves in nonthermal plasmas. Physics of Plasmas, 25 (1). 013704. ISSN 1070-664X (https://doi.org/10.1063/1.5011005)

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Abstract

Dust acoustic (DA) solitary and shock structures have been investigated under the influence of Landau damping in a dusty plasma containing two temperature nonthermal ions. Motivated by the observations of Geotail spacecraft that reported two-temperature ion population in the Earth's magnetosphere, we have investigated the effect of resonant wave-particle interactions on DA nonlinear structures. The KdV equation with an additional Landau damping term is derived and its analytical solution is presented. The solution has the form of a soliton whose amplitude decreases with time. Further, we have illustrated the influence of Landau damping and nonthermality of the ions on DA shock structures by a numerical solution of the Landau damping modified KdV equation. The study of the time evolution of shock waves suggests that an initial shock-like pulse forms an oscillatory shock at later times due to the balance of nonlinearity, dispersion and disspation due to Landau damping. The findings of the present investigation may be useful in understanding the properties of nonlinear structures in the presence of Landau damping in dusty plasmas containing two temperature ions obeying nonthermal distribution such as in the Earth's magnetotail.

  • Item type:Article
    ID code:62768
    Dates:
    Date
    Event
    10 January 2018
    Published
    24 December 2017
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:09 Jan 2018 11:46
    Last modified:18 Apr 2024 00:21
    URI:https://strathprints.strath.ac.uk/id/eprint/62768
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