OBLIQUE PROPAGATION OF DUST ACOUSTIC SOLITARY WAVES IN A SELF-GRAVITATING OPPOSITE POLARITY DUSTY PLASMA SYSTEM

The basic features of dust acoustic solitary waves (DASWs) in self-gravitating opposite polarity dust plasma (OPDP) system containing arbitrarily charged inertial positive and negative dust (also with arbitrary amount of masses), and inertia-less electrons and ions following Maxwellian distribution in presence of an external static magnetic field have been studied by the reductive perturbation method. The combined effects of external magnetic field and dust of opposite polarity, which are found to significantly modify the basic properties (polarity, amplitude and width) of small but finite-amplitude dust acoustic solitary waves, are explicitly examined. The implications of our results in space and laboratory plasmas are briefly discussed.