Figure 2

Snapshots of magnetic energy spectra in the spectral domain spanning the perpendicular components of the wavevectors. Snapshots of magnetic energy spectra in the spectral domain spanning the perpendicular components of the wavevectors k _⊥ to the large-scale magnetic field (normalized to the ion inertial scale using the Alfvén speed V _A and the ion gyrofrequency Ω _p) and the frequencies (normalized to Ω _p). Left column shows the snapshots for ion beta 0.05 at 64 ion gyroperiods (top, the earliest possible time for recording the wavenumber-frequency spectrum), 200 gyroperiods (middle, the intermediate state before the transition), and 800 gyroperiods (bottom, after the transition). Middle column shows the snapshots for ion beta 0.1 at time 64 gyroperiods (top), 200 gyroperiods (middle), and 1200 gyroperiods (bottom). Right column shows the snapshots for ion beta 0.2 at time 64 gyroperiods (top), 200 gyroperiods (middle), and 1600 gyroperiods (bottom).