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Twisted waves and instabilities in a permeating dusty plasma

Published online by Cambridge University Press:  13 March 2018

S. Bukhari Open the ORCID record for S. Bukhari [Opens in a new window] ,
S. Ali ,
S. A. Khan  and
J. T. Mendonca
S. Bukhari*
Affiliation:
Department of Physics, The University of Azad Jummu and Kashmir, Muzaffarabad 13100, Azad Kashmir National Center for Physics at Quaid-e-Azam University Campus, Shahdra Valley Road, Islamabad 44000, Pakistan
S. Ali
Affiliation:
Department of Physics, The University of Azad Jummu and Kashmir, Muzaffarabad 13100, Azad Kashmir National Center for Physics at Quaid-e-Azam University Campus, Shahdra Valley Road, Islamabad 44000, Pakistan Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, PR China
S. A. Khan
Affiliation:
National Center for Physics at Quaid-e-Azam University Campus, Shahdra Valley Road, Islamabad 44000, Pakistan
J. T. Mendonca
Affiliation:
IPFN, Instituto Superior Tecnico, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
*
†Email address for correspondence: [email protected]
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Abstract

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.

Keywords

astrophysical plasmasdusty plasmasplasma instabilities
Type
Research Article
Information
Journal of Plasma Physics , Volume 84 , Issue 2 , April 2018 , 905840202
Copyright
© Cambridge University Press 2018 

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