Surfatron acceleration along magnetic field by oblique electrostatic   waves
  Charged particles can be accelerated via surfatron mechanism along dc magnetic field by obliquely propagating electrostatic waves. In plasma, this mechanism can, in principle, produce an average parallel current, even when the wave frequency is much larger than the gyrofrequency and the wave phase velocity is much larger than particle initial velocities. 
I. Y. Dodin and N. J. Fisch
physics.plasm-ph