Mach cones and magnetic forces in Saturn’s rings

  • T. W. Hartquist
  • O. Havnes


Recently, Mamun, Shukla, and Bingham [2] claimed that Havnes and his collaborators [1] 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. [1] were not in error.

PACS numbers

96.30.Wr 96.30.Mh 96.35.Pb 52.27.Lw 52.35.Fp 


  1. 1.
    O. Havnes, T. Aslaksen, T. W. Hartquist, et al., J. Geophys. Res. 100, 1731 (1995); J. Vac. Sci. Technol. A 14, 525 (1996); Planet. Space Sci. 49, 223 (2001); A. Brattli, O. Havnes, and F. Melandso, Phys. Plasmas 9, 958 (2002).CrossRefADSGoogle Scholar
  2. 2.
    A. A. Mamun, P. K. Shukla, and R. Bingham, JETP Lett. 77, 541 (2003).CrossRefADSGoogle Scholar
  3. 3.
    F. Li and O. Havnes, Planet. Space Sci. 48, 117 (2000).ADSGoogle Scholar

Copyright information

© MAIK "Nauka/Interperiodica" 2003

Authors and Affiliations

  • T. W. Hartquist
    • 1
  • O. Havnes
    • 2
  1. 1.Department of Physics and AstronomyUniversity of LeedsLeedsUK
  2. 2.Department of PhysicsUniversity of TromsøTromsøNorway

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