2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/95526The grains immersed in plasma get eroded by the ions falling onto them. As a consequence, they exhibit self-consistent mass fluctuations due to perturbations in the plasma charging currents. The grain mass is then a dynamical variable. The modifications in the plasma dielectric properties are investigated and new ultra-low frequency modes are shown to exist in the plasma.8 pagesPlasma PhysicsSpace Physicstext