A nonextensive approach for the instability of current-driven ion-acoustic waves in space plasma

Details A nonextensive approach for the instability of current-driven ion-acoustic waves in space plasma A nonextensive approach for the instability of current-driven ion-acoustic waves in space plasma

2009-07-11

arxiv.org/abs/0907.1966v2

Physics of Plasmas, 16(2009)072111

Physics

Plasma Physics

12 pages,4figures,20 references

Scientific paper

10.1063/1.3176516

The instability of current-driven ion-acoustic waves in the collisionless magnetic-field-free space plasma is investigated by using a nonextensive approach. The ions and the electrons are thought of in the power-law distributions that can be described by the generalized q-Maxwellian velocity distribution and are considered with the different nonextensive q-parameters. The generalized q-wave frequency and the generalized instability q-growth rate for the ion-acoustic waves are derived. The numerical results show that the nonextensive effects on the ion-acoustic waves are not apparent when the electron temperature is much more than the ion temperature, but they are salient when the electron temperature is not much more than the ion temperature. As compared with the electrons, the ions play a dominant role in the nonextensive effects.

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