Effects of dust grain charge fluctuation, obliqueness and external magnetic
field on a finite-amplitude dust acoustic solitary potential in a magnetized
dusty plasma, consisting of electrons, ions and charge-fluctuating dust grains, are
investigated using the reductive perturbation method. It is shown that such a magnetized
dusty plasma system may support a dust acoustic solitary potential on a
very slow time scale involving the motion of dust grains, whose charge is self-
consistently determined by local electron and ion currents. The effects of dust grain
charge fluctuation, external magnetic field and obliqueness are found to modify the
properties of this dust acoustic solitary potential significantly. The implications of
these results for some space and astrophysical dusty plasma systems, especially
planetary ring systems and cometary tails, are briefly mentioned.
