TITLE

Modulational instability of ion-acoustic waves in plasmas with superthermal electrons

AUTHOR(S)
Gharaee, H.; Afghah, S.; Abbasi, H.
PUB. DATE
March 2011
SOURCE
Physics of Plasmas;Mar2011, Vol. 18 Issue 3, p032116
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Using the reductive perturbation technique, the modulational instability of ion- acoustic waves in a plasma containing superthermal electrons is studied. It is found that the presence of superthermal electrons significantly changes the instability domain. A Lorentzian (kappa) velocity distribution function is used to model superthermal electrons. It is shown that the presence of superthermal electrons reduces the critical frequency of the modulational instability of ion-acoustic waves. Besides, due to the presence of the superthermal electrons, ion-acoustic waves are unstable on a vaster region. Moreover, the modulational instability growth rate is larger for a larger population of superthermal electrons.
ACCESSION #
59744068

 

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