Abstract
Instability due to the external gravitation might be observed in interplanetary space and laboratory experiments. The particle motion is governed by the gravitational and electromagnetic forces. In actual situations, the gravitational effect is considered to be significant when a fall of dust grains causes the damage of the device in engineering-aided plasmas. This chapter examines the effect of the gravitational force on dust grains in a dusty plasma. The result of simulation shows that the terrestrial gravitation affects not only the density and fluid velocity of dust grains but the dust-charge. This is interpreted by the comparison between the Debye length and the average inter-grain distance. Results obtained at various parameters of dust particles show that the influence of dust particles on sheaths strongly depends on relations between some characteristic times—the time of an ion penetration through a sheath, the ion collection time, and the ion scattering time.
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