Fig. 4: Example event selection during a Swarm A auroral zone crossing. | Nature Communications

Fig. 4: Example event selection during a Swarm A auroral zone crossing.

From: Northern preference for terrestrial electromagnetic energy input from space weather

Fig. 4

Magnetic and electric field and related field-aligned electromagnetic energy from an event selected by the analysis algorithm between 05:12:00 and 05:15:00 UT on 17 November 2016. Panels show a magnetic field B_y component, b electric field E_x component, c S_z component Poynting flux low-pass filtered with S2avitsky-Golay filter of window sizes 9, 27 and 47 s (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 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 electric field are not provided in the dataset. Please refer to ref. 36 for a discussion of the errors.

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