Linear instability of dust acoustic waves in a magnetized gravitating plasma inthe presence of dust streaming

Abstract

Linear instability of dust acoustic waves (DAWs) has been theoretically studied in a collisionless gravitatingdust-ion magnetized plasma including the effect of dust streaming. A linear dispersion relation has been derived byusing the method of normal mode analysis. Gravitational effect is found to make the low-frequency DAW mode linearlyunstable in certain parametric regions. The dependence of the growth rate of the instability on various plasma parameterssuch as streaming of dust particles, size of the dust grain, strength of the magnetic eld, obliqueness of propagation, andnumber density of dust particles has been numerically analyzed and presented graphically.