STREAMING INSTABILITY OF A DUSTY PLASMA IN THE PRESENCE OF MASS AND CHARGE VARIATION

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 stre aming velocity of the dust grains leads to a novel coupling of the dus t mass fluctuation with other dynamic variables of the plasma and the grains. The,mass fluctuations causes a collisionless dissipation and p rovides an alternate channel for the beam mode instability to occur. P hysically the negative energy wave associated with the beam mode coupl es to the mass fluctuation induced dissipative medium to produce the i nstability. We conclude that the higher value of the ion mass density to the dust mass density ratio reduces the threshold value for the ons et of the instability. Its application in the astrophysical context is discussed.