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Twisted waves and instabilities in a permeating dusty plasma
Bukhari, S.; Ali, S.; Khan, S. A.; Mendonca, J. T.
AA(Department of Physics, The University of Azad Jummu and Kashmir, Muzaffarabad 13100, Azad Kashmir), AB(Department of Physics, The University of Azad Jummu and Kashmir, Muzaffarabad 13100, Azad Kashmir), AC(National Center for Physics at Quaid-e-Azam University Campus, Shahdra Valley Road, Islamabad 44000, Pakistan), AD(IPFN, Instituto Superior Tecnico, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal)
Journal of Plasma Physics, Volume 84, Issue 2, article id. 905840202, 14 pp.
Publication Date:
astrophysical plasmas, dusty plasmas, plasma instabilities,
Abstract Copyright:
(c) 2018: © Cambridge University Press 2018
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New features of the twisted dusty plasma modes and associated instabilities are investigated in permeating plasmas. Using the Vlasov-Poisson model equations, a generalized dispersion relation is obtained for a Maxwellian distributed plasma to analyse the dust-acoustic and dust-ion-acoustic waves with finite orbital angular momentum (OAM) states. Existence conditions for damping/growth rates are discussed and showed significant modifications in twisted dusty modes as compared to straight propagating dusty modes. Numerically, the instability growth rate, which depends on particle streaming and twist effects in the wave potential, is significantly modified due to the Laguerre-Gaussian profiles. Relevance of the study to wave excitations due to penetration of solar wind into cometary clouds or interstellar dusty plasmas is discussed.
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