The stable conditions and gravitational effects on the surface dustacoustic wave are investigated in self-gravitating semi-bounded dusty plasmas. The dispersion relation of the surface dust-acoustic wave is obtained by the plasma dielectric function with the specular reflection boundary condition. It is shown that the surface dust-acoustic wave become unstable for any values of the wave number when 1 2 ≤ (ω J /ω pd) 2 ≤ 1. However, when (ω J /ω pd) 2 > 1 or (ω J /ω pd) 2 < 1 2 , the Jeans instability does not occur for the domain of the wave number k z λ D > (ω J /ω pd)|[(ω J /ω pd) 2 −1]/[2(ω J /ω pd) 2 −1]| 1/2. It is also found that the phase velocity of the surface wave decreases with increasing Jeans frequency.
The surface dust cyclotron waves are investigated in semi-bounded magnetized dusty plasmas. The dispersion relation is obtained by the plasma dielectric function with the specular reflection boundary condition. The result shows the existence of the low-frequency backward wave branch in the surface dust cyclotron wave. The frequency of the wave is found to be decreased with the dust Debye wave number. It is also found that there is a minimum position of the scaled group velocity in the small-wave-number region. It is interesting to note that the group velocity increases below the minimum position and, however, decreases above the minimum position with increasing the dust Debye wave number.
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