Articles | Volume 20, issue 5
Nonlin. Processes Geophys., 20, 899–919, 2013
Nonlin. Processes Geophys., 20, 899–919, 2013

Research article 31 Oct 2013

Research article | 31 Oct 2013

Ion motion in the current sheet with sheared magnetic field – Part 2: Non-adiabatic effects

A. V. Artemyev1,2, A. I. Neishtadt1,3, and L. M. Zelenyi1 A. V. Artemyev et al.
  • 1Space Research Institute RAS, Profsouznaya st., 84/32, GSP-7, 117997 Moscow, Russia
  • 2Laboratoire de physique et chimie de l'environnement et de l'Espace (LPC2E), UMR7328, CNRS – University of Orleans, Orleans, France
  • 3Department of Mathematical Sciences, Loughborough University, Loughborough LE11 3TU, UK

Abstract. We investigate dynamics of charged particles in current sheets with the sheared magnetic field. In our previouspaper (Artemyev et al., 2013) we studied the particle motion in such magnetic field configurations on the basis of the quasi-adiabatic theory and conservation of the quasi-adiabatic invariant. In this paper we concentrate on violation of the adiabaticity due to jumps of this invariant and the corresponding effects of stochastization of a particle motion. We compare effects of geometrical and dynamical jumps, which occur due to the presence of the separatrix in the phase plane of charged particle motion. We show that due to the presence of the magnetic field shear, the average value of dynamical jumps is not equal to zero. This effect results in the decrease of the time interval necessary for stochastization of trapped particle motion. We investigate also the effect of the magnetic field shear on transient trajectories, which cross the current sheet boundaries. Presence of the magnetic field shear leads to the asymmetry of reflection and transition of particles in the current sheet. We discuss the possible influence of single-particle effects revealed in this paper on the current sheet structure and dynamics.