论文标题
声学和漂移模式的耦合,天体物理灰尘等离子体中的谐波仿真以及彗星中的新模式
Coupling of acoustic and drift modes, harmonic modons in astrophysical dusty plasma and a new mode in the Comet Halley
论文作者
论文摘要
该手稿介绍了在有界的不构型尘土等血浆中声学和漂移波的线性和非线性特征的理论研究,该血浆在太空和实验室环境中具有潜在的应用。在此分析中,假定所有血浆颗粒的流动沿轴向方向是沿轴向的,而速度的梯度被认为是沿径向方向的。首先,我们研究灰尘修饰的离子声(DMA)和漂移(DMD)波(线性分析)的耦合,当灰尘的动态保持不活跃时,后来研究了非线性涡流的形成,例如结构。在第二种情况下,在尘埃参与动力学时,研究了超低频率灰尘声(UDA)和尘埃漂移(ULD)波之间的耦合,并在非线性分析中获得了诸如溶液之类的型号。在分析和数值上研究了具有高于偶极涡流的方位角谐波的涡流解决方案的存在。稍后,我们扩展了分析,以考虑尘埃颗粒在彗星中的存在和热带中层灰尘的血浆中的应用,在较早的情况下,我们报告说,出乎意料的彗星Halley等离子体承认一种新的模式,在该模式中,背景中存在灰尘没有任何影响,这种模式与对流的细胞模式相似,在静电(exb)造成量化的范围内,降低了降低的范围,而降低了降低的范围。对于此模式的线性分析,未观察到耦合,但是这种对流单元模式会演变,而该模式的非线性动力学则可以遵守涡旋状溶液。
This manuscript, presents a theoretical study of the linear and nonlinear characteristics of acoustic and drift waves in a bounded inhomogenious dusty plasma which has potential applications in space and lab environments. In this analysis, flow of all plasma particles is assumed to be along the axial direction whereas gradients in velocity are considered to be along the radial direction. First we study coupling of dust modified ion acoustic (DMA) and drift (DMD) waves (linear analysis) at fast time when dynamics of dust remain inactive, later formation of nonlinear vortex like structures are examined. In the second case at slow time when dust participates in dynamics, coupling between ultra low frequency dust acoustic (UDA) and dust drift (ULD) waves is studied and modons like solutions are obtained in the nonlinear analysis. Existence of the vortex solution with azimuthal harmonics higher than the dipole vortex has been studied both analytically and numerically. Later we extend our analysis to consider applications of dust particle's presence in the comet Halley and tropical mesospheric dusty plasma where in earlier case we report that that unexpectedly comet Halley plasma admits a new mode where presence of dust in background does not have any affect, this mode is similar to the convective cell mode where electrostatic drift (ExB) cancels out, density gradients also vanish due to the presence of negative ions and only polarization drift contributes to the mode. For the linear analysis of this mode, there is no coupling observed but this the convective cell mode evolves whereas nonlinear dynamics of this mode are found to obey the vortex-like solution.