Effect of superthermality on nonlinear electrostatic modes in plasmas
  The nonlinear propagation of electron-acoustic solitary structures is investigated in a plasma containing kappa-distributed (superthermal) electrons. Different types of localized structures are shown to exist. The occurrence of modulational instability is investigated. 
S. Sultana, A. Danehkar, N. S. Saini, M. A. Hellberg, I. Kourakis
physics.plasm-ph astro-ph.SR nlin.PS