Articles | Volume 21, issue 1
Nonlin. Processes Geophys., 21, 115–125, 2014

Special issue: Nonlinear waves and chaos in space plasmas

Nonlin. Processes Geophys., 21, 115–125, 2014

Research article 16 Jan 2014

Research article | 16 Jan 2014

Relativistic surfatron process for Landau resonant electrons in radiation belts

A. Osmane1,2 and A. M. Hamza1 A. Osmane and A. M. Hamza
  • 1University of New Brunswick, Physics Department, Fredericton, New Brunswick, Canada
  • 2Aalto University, Radio Science and Engineering, Espoo, Finland

Abstract. Recent theoretical studies of the nonlinear wave-particle interactions for relativistic particles have shown that Landau resonant orbits could be efficiently accelerated along the mean background magnetic field for propagation angles θ in close proximity to a critical propagation θc associated with a Hopf–Hopf bifurcation condition. In this report, we extend previous studies to reach greater modeling capacities for the study of electrons in radiation belts by including longitudinal wave effects and inhomogeneous magnetic fields. We find that even though both effects can limit the surfatron acceleration of electrons in radiation belts, gains in energy of the order of 100 keV, taking place on one tenth of a millisecond, are sufficiently strong for the mechanism to be relevant to radiation belt dynamics.