Abstract
The dynamics of dust-ion-acoustic (DIA) modes at Comet 67P/Churyumov-Gerasimenko, where H2O+ ions with warm and cold electrons as well as dust grains were detected, are investigated within the two-electron-temperature dusty plasmas model by the kinetic theory. In terms of current-driven DIA waves, the bulk electron drift is assumed to overcome Landau damping due to resonance interaction of DIA waves with cometary ions. The results show that the presence of charged dust grains lowers the critical drift velocity of bulk electrons and the Landau damping rates, and inversely enhances the growth rates of DIA instabilities. Consequently, the presented dust grains make the DIA modes more easily excited. The present results indicate that the DIA wave may be a possible candidate to interpret the wave observation of the European Space Agency's spacecraft “Rosetta” at comet 67P/Churyumov-Gerasimenko.
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