Abstract
The wake effect among dust grains in a flowing plasma is studied by the linear-response dielectric theory within the linear hydrodynamics model. The expression of potential is derived, and it can be divided into two parts: one is the screened Coulomb short-ranged repulsive potential, and the other is the long-ranged oscillatory wake potential. The numerical results show that both the amplitude and wavelength of the wake potential depend on the Mach number, in such a manner that the wavelength of the oscillating potential increases, while its amplitude decreases, with increasing Mach number.
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