Mach cones and magnetic forces in Saturn’s rings
Recently, Mamun, Shukla, and Bingham  claimed that Havnes and his collaborators  mistakenly neglected magnetic fields in their work on Mach cones as potentially powerful diagnostics of properties in Saturn’s rings. We show that the magnetic force on a charged particle is entirely negligible in comparison with the electric force on the particle in a wave with a wavenumber relevant to the Saturnian Mach cone problem. Havnes et al.  were not in error.
PACS numbers96.30.Wr 96.30.Mh 96.35.Pb 52.27.Lw 52.35.Fp