Left: Time evolution of the vertical (z) profile of the azimuthal component of the magnetic field averaged over x − y plane. The color code is normalized by an exponential factor to compensate for an exponential growth of magnetic fields. The mean magnetic field eventually grows to a large-sale mode symmetric with respect to the Galactic mid-plane. Right: Time evolution of various contributions to magnetic energy, normalized to the turbulent kinetic energy (which stays roughly constant in time). The black solid line corresponds to the total magnetic energy contribution, the red dashed line corresponds to the magnetic energy of mean magnetic fields (averaged over the horizontal x − y planes) and with the blue dot-dashed line to the magnetic energy in the RMS magnetic fields. The magnetic energy is amplified exponentially for about a Gyr and eventually reaches an equipartition with turbulent kinetic energy. Figure adapted from Bendre & Subramanian 2022.