Figure 4: Example event selection during a Swarm A auroral zone crossing. Magnetic and electric field and related field-aligned electromagnetic energy from an event selected by the analysis algorithm between 05:11:30-05:15:00 UT on 17 Nov 2016. From top to bottom, each panel shows (a) magnetic field B_y component, (b) electric field E_x component, (c), S_z component Poynting flux low-pass filtered with Savitsky-Golay filter of window sizes 9, 27 and 47 seconds (blue, red, and black, respectively), capturing small-scale, mesoscale, and large-scale perturbations, and (d) along-track integrated Poynting flux using the three filtered time series from panel (c). Note that the event is selected based implicitly on coherent electromagnetic fields, and with its temporal extent defined from the local peak in the low-pass filtered Poynting flux to a specified lower threshold (see text for details). Please note that error estimates on the E-field are not provided in the dataset. Please refer to [36] for a discussion of the errors.