Drift ion acoustic shock waves in an inhomogeneous two-dimensional quantum magnetoplasma

作者：Masood W^*; Karim S; Shah H A; Siddiq M

来源：Physics of Plasmas, 2009, 16(4): 042108.

DOI：10.1063/1.3109663

Linear and nonlinear propagation characteristics of drift ion acoustic waves are investigated in an inhomogeneous quantum plasma with neutrals in the background employing the quantum hydrodynamics (QHD) model. In this regard, a quantum Kadomtsev-Petviashvili-Burgers (KPB) equation is derived for the first time. It is shown that the ion acoustic wave couples with the drift wave if the parallel motion of ions is taken into account. Discrepancies in the earlier works on drift solitons and shocks in inhomogeneous plasmas are also pointed out and a correct theoretical framework is presented to study the one-dimensional as well as the two-dimensional propagation of shock waves in an inhomogeneous quantum plasma. Furthermore, the solution of KPB equation is presented using the tangent hyperbolic (tanh) method. The variation of the shock profile with the quantum Bohm potential, collision frequency, and ratio of drift to shock velocity in the comoving frame, vu, are also investigated. It is found that increasing the number density and collision frequency enhances the strength of the shock. It is also shown that the fast drift shock (i.e., vu > 0) increases, whereas the slow drift shock (i.e., vu < 0) decreases the strength of the shock. The relevance of the present investigation with regard to dense astrophysical environments is also pointed out.

• 出版日期2009-4