High order spectral analysis of electron plasma oscillations in the electron foreshock Original Research Article

The electron foreshock is the region in which electrons that have been reflected from the shock propagate back upstream along the magnetic field lines forming electron beams. The process of relaxation of these beams is one of the fundamental topics in plasma physics. It involves numerous nonlinear processes. High order spectral analysis is applied to Cluster measurements to assess the strength of various nonlinear processes involved in the dynamics of the turbulence.