Articles | Volume 39, issue 1
Ann. Geophys., 39, 53–68, 2021
https://doi.org/10.5194/angeo-39-53-2021
Ann. Geophys., 39, 53–68, 2021
https://doi.org/10.5194/angeo-39-53-2021

Regular paper 15 Jan 2021

Regular paper | 15 Jan 2021

Ion acoustic waves near a comet nucleus: Rosetta observations at comet 67P/Churyumov–Gerasimenko

Herbert Gunell et al.

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Short summary
When the magnetised solar wind meets the plasma surrounding a comet, the magnetic field is enhanced in front of the comet, and the field lines are draped around it. This happens because electric currents are induced in the plasma. When these currents flow through the plasma, they can generate waves. In this article we present observations of ion acoustic waves, which is a kind of sound wave in the plasma, detected by instruments on the Rosetta spacecraft near comet 67P/Churyumov–Gerasimenko.