Ohmic heating rate (~j²) at a fixed point in space for more than a solar hour. The data points are marked by crosses. Here a gridpoint at the very base of the corona and transition region (≈3 Mm height) was chosen which is representative of the region where the heating rate per particle is maximal. The large cross in Fig. 2 indicates the horizontal location. The shaded regions (A) and (B) indicate a nanoflare storm and a single nanoflare, see Sect. 3.