Monday, February 6, 2012

1202.0641 (Jingyu Gong et al.)

Dust-acoustic waves and stability in the permeating dusty plasma: I. Maxwellian distribution    [PDF]

Jingyu Gong, Zhipeng Liu, Jiulin Du
The dust-acoustic waves and their stability in permeating dusty plasma with the Maxwellian velocity distributions are investigated. We derived expressions of the frequency and the instability growth rate of dust-acoustic waves for two limiting cases, respectively, when thermal velocity of the flowing dusty plasma is much larger than and much smaller than the phase velocity of the waves, and therefore we obtained stability criterions of the dust-acoustic waves, which is found strongly to depend on flowing velocity of the flowing dusty plasma. The numerical calculations show that, in the former case, the waves are generally unstable for any flowing velocity, but in the latter case, the waves become unstable only when the wave number is smaller and the flowing velocity is larger. When the physical conditions are in between the two limiting cases above, we show a strong insight on dependence of the dust-acoustic wave instability on such physical conditions as well as the flowing velocity in permeating dusty plasma.
View original: http://arxiv.org/abs/1202.0641

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