Nonlinear dust acoustic waves in electronegative dusty plasmas

摘要: The problem of nonlinear localized dust acoustic (DA) is addressed in a plasma comprising positive ions, negative and mobile negatively charged grains. We first consider the case when grain charge remains constant discuss later variations are self-consistently included. It found that relative increase ion density favors propagation DA solitary waves, sense domain their admissible Mach numbers enlarges. Furthermore, electronegativity makes structure more spiky. When Q d allowed to fluctuate, latter expressed terms Lambert function we take advantage this transcendental investigate variable wave. adopts profile becomes as number charges Z (−) increases. grains be highly localized. This localization (accumulation) caused by balance electrostatic forces acting on effective for lower values (−). An may lead local depletion ions from region soliton’s localization. results useful understand salient features large amplitude waves cosmic plasmas such ionospheric D-region mesosphere.