Double layer structures in space dusty plasmas with regularized kappa-distributed electrons

This study investigates the formation and properties of double-layer structures in a space dusty plasma composed of regularized Kappa-distributed electrons, Maxwellian ions and positively charged dust grains. The plasma dynamics are modeled using a fluid framework, and a weakly nonlinear analysis is performed via a standard perturbative approach. This analysis yields an extended evolution equation governing the behavior of electrostatic disturbances in the system. The results demonstrate that the parameters of the electron distribution play a crucial role in determining the existence and nature of double layers. In particular, the plasma supports only compressive double-layer structures within specific parameter regimes. It is shown that the nonthermal character of the electrons, ion concentration, and relative ion temperature significantly modify the characteristics of the double layers. Overall, this work provides new physical insight into the influence of nonthermal electron populations on electrostatic double layers in space dusty plasmas, with relevance to a wide range of astrophysical and space environments.