Fig. 3
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Two-dimensional FFT of Ey between 227 and 257 km (left panel, DCBL location) and between 348 and 408 km (right panel, magnetised part), both between 0 and 0.005 s. Sampling rates are Δx in space and 100Δt in time. For the right panel, as we are in the magnetised part, the pulsation is given in terms of electron cyclotron pulsation.
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