(1) Indian Institute of Geomagnetism, Dr. Nanabhai Moos Marg, 400 005 Colaba, Bombay, India;(2) Plasma Physics Division, Institute of Advanced Study in Science and Technology, 781 022 Jawaharnagar, Khanapara, Guwahati, Assam, India
Abstract:
We study the effect of the mass and charge dynamics on the collective behaviour of a dusty plasma. It is shown that the finite
non-zero streaming velocity of the dust grains leads to a novel coupling of the dust mass fluctuation with other dynamic variables
of the plasma and the grains. The mass fluctuations causes a collisionless dissipation and provides an alternate channel for
the beam mode instability to occur. Physically the negative energy wave associated with the beam mode couples to the mass
fluctuation induced dissipative medium to produce the instability. We conclude that the higher value of the ion mass density
to the dust mass density ratio reduces the threshold value for the onset of the instability. Its application in the astrophysical
context is discussed.