Nonlinear Interaction and Modulational Instability of Dust Acoustic Disturbances in a Magnetized Cometary Plasma

The interplay of dust acoustic waves (DAWs) and it's amplitude modulation is investigated in a magnetized five-component cometary plasma comprising positively charged hydrogen and oxygen ions, negatively charged dust grains, along with superthermal electrons (solar and cometary). The interplay dynamics of the dust acoustic waves (DAWs) is described by the Kortweg–de Vries (KdV) equation. The appearance of multi-soliton profiles are derived using Hirota's method. The amplitude modulation of the DAWs is investigated through nonlinear Schrodinger equation. In the numerical study, it appears that the dark-envelope soliton may exist in such cometary plasmas, but the emergence of bright-envelope soliton is not possible at any condition. Superthermality, magnetic field strength, ion and electron concentration, and other physical factors have all been explored for their impacts. The findings of this research may contribute to our understanding of the nonlinear characteristics and wave propagation stability of electrostatic wave excitations in cometary coma environments.