Dispersion relations for ion-acoustic-like waves in plasmas with and without superthermal particles are calculated using a simple pole expansion of the distribution function for the ions. It is found that slow weakly damped modes exist in two-temperature plasmas, and the conditions when these modes appear are investigated. For plasmas with equal ion and electron temperatures weakly damped modes are found when there is a depletion of the high-energy tails.
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© 2001 American Institute of Physics.
2001
American Institute of Physics
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