Parallel component of the escaping Poynting flux as captured in the detection plane at a height H ≈ 2150 m and averaged over the time interval T ∈ [34.7, 43.4] μs. Top panel: Averaged Poynting flux. Bottom panel: Normalized standard deviation of the Poynting flux, overlaid with black lines indicating the PA. The dashed magenta line denotes the last open field line. The orange lines denote the trajectories of constant latitudes used for further investigation.