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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Two-dimensional dissipative structures in spatially nonuniform dusty plasmas in planetary magnetospheres with kappa distributed ions
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Two-dimensional dissipative structures in spatially nonuniform dusty plasmas in planetary magnetospheres with kappa distributed ions

机译：具有κ分布离子的行星磁层空间不均匀尘埃等离子体中的二维耗散结构

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摘要

Linear and nonlinear propagation of coupled dust drift acoustic waves are investigated in the presence of a kappa distributed ion population and Boltzmannian electrons. It is observed that the frequency of the dust drift acoustic wave decreases by increasing the kappa value. Using the drift approximation, a nonlinear equation is derived for the dust drift acoustic shock wave that reduces to a Kadomtsev-Petviashvili-Burgers (KPB)-like equation in the comoving frame of reference. It is found that the nonlinear structure of dust drift acoustic shock waves modifies in the presence of increasing values of kappa, dust number density, ambient magnetic field, and the dust neutral collision frequency. Interestingly, it is found that the non-Maxwellian ion population modifies the scale lengths over which the nonlinear structures are formed. The results obtained are applied in Saturn's magnetosphere, where the non-Maxwellian distribution of particles has been reported by several satellite missions.
机译：在存在κ分布离子种群和玻尔兹曼电子的情况下，研究了耦合的尘埃漂移声波的线性和非线性传播。观察到，通过增加kappa值，灰尘漂移声波的频率降低。使用漂移近似，推导了灰尘漂移声冲击波的非线性方程，该方程在参考的共同移动框架中简化为类似Kadomtsev-Petviashvili-Burgers（KPB）的方程。发现在kappa值，尘埃数密度，环境磁场和尘埃中性碰撞频率增加的情况下，尘埃漂移声冲击波的非线性结构发生了变化。有趣的是，发现非麦克斯韦离子群改变了形成非线性结构的标度长度。所获得的结果被应用于土星的磁层，那里有多个卫星飞行任务报告了粒子的非麦克斯韦分布。

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