Dust kinetic Alfven solitary and rogue waves in a superthermal dusty plasma

Dust kinetic Alfven solitary waves (DKASWs) have been examined in a low-beta dusty plasma comprising of negatively charged dust grains, superthermal electrons, and ions. A nonlinear Korteweg-de Vries (KdV) equation has been derived using the reductive perturbation method. The combined effects of superthermality of charged particles (via kappa), plasma beta, obliqueness of propagation (theta), and dust concentration (via f) on the shape and size of the DKASWs have been examined. Only negative potential (rarefactive) structures are observed. Further, characteristics of dust kinetic Alfven rogue waves (DKARWs), by deriving the non-linear Schrodinger equation (NLSE) from the KdV equation, are studied. Rational solutions of NLSE show that rogue wave envelopes are supported by this plasma model. It is observed that the influence of various plasma parameters (superthermality, plasma beta, obliqueness, and dust concentration) on the characteristics of the DKARWs is very significant. This fundamental study may be helpful in understanding the formation of coherent nonlinear structures in space and astrophysical plasma environments where superthermal particles are present. (C) 2015 AIP Publishing LLC.