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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