The parametric coupling between large amplitude magnetic field-aligned circularly polarized electromagnetic ion-cyclotron (EMIC) waves and ponderomotively driven ion-acoustic perturbations in magnetized space plasmas is considered. A cubic nonlinear Schrödinger equation for the modulated EMIC wave envelope is derived, and then solved analytically. The modulated EMIC waves are found to be stable...

Introduction The damping rate of ion-acoustic waves in plasma plays an important role in establishing the threshold for the onset of stimulated Brillouin scattering, ion-temperature-gradient instability, current-driven ion-acoustic instability, and other drift-wave microinstabilities. The effect of electron-ion (ei) collisions on the ion-acoustic damping rate has been recently investigated by a...