Table of Contents
Journal of Astrophysics
Volume 2014, Article ID 785670, 8 pages
http://dx.doi.org/10.1155/2014/785670
Research Article

Modulation Instability of Ion-Acoustic Waves in Plasma with Nonthermal Electrons

1Department of Physics, Jadavpur University, Kolkata 700 032, India
2Department of Electronics, Vidyasagar College, Kolkata 700 006, India

Received 2 May 2014; Accepted 3 July 2014; Published 16 July 2014

Academic Editor: Milan S. Dimitrijevic

Copyright © 2014 Basudev Ghosh and Sreyasi Banerjee. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Modulational instability of ion-acoustic waves has been theoretically investigated in an unmagnetized collisionless plasma with nonthermal electrons, Boltzmann positrons, and warm positive ions. To describe the nonlinear evolution of the wave amplitude a nonlinear Schrödinger (NLS) equation has been derived by using multiple scale perturbation technique. The nonthermal parameter, positron concentration, and ion temperature are shown to play significant role in the modulational instability of ion-acoustic waves and the formation of envelope solitons.