Self-Extinction of Dust-Acoustic Shock Waves in Nonthermal Plasma Under Microgravity Conditions

We investigate the nonlinear propagation and self-extinction of dust-acoustic shock waves (DASWs) in a nonthermal plasma composed of nonthermally distributed electrons, cold ion beams, and fluctuating-charge dust grains under microgravity conditions. We identify four governing parameters that collectively determine shock morphology: gravitational coupling, non-thermal particle distributions, dust grain characteristics, and electron temperature. The analysis illustrates in a more gradual manner how microgravity induces wave asymmetry through enhanced dispersion and modified charging dynamics. Depending on the temperature range, the system shows three recognizable behaviors, from strongly dispersive to weakly perturbed states. These findings help outline a broader picture for interpreting shock formation in space plasmas, with direct implications for spacecraft measurements and astrophysical plasma modeling. The parameter dependencies quantified here offer a practical basis for anticipating wave behavior in complex dusty-plasma environments under gravitational influence.