Magnetic energy spectrum E ( k
, ω ) averaged over the spatial coordinates parallel to the large-scale magnetic field for two simulation boxes at an earlier evolution time (200 ion gyroperiods, t Ω
=200). The wave modes are marked by IB1 (ion Bernstein ω/Ω
= 1), IB2 (ion Bernstein ω/Ω
= 2), IC (ion cyclotron), and W (whistlers).