Fig. 2.
Fourier power maps (log-scale) within the different frequency ranges for AIA 1700 Å (left column) and IRIS 1400 Å (right column). Top row: Fourier power map in the high-frequency range (i.e., 11.04 mHz) for the photosphere (panel A) and TR (panel B). Middle row: Fourier power maps in intermediate frequency (i.e., 5.37 mHz) for the photosphere (panel C) and TR (panel D). Bottom row: Fourier maps for low frequency (i.e., 1.64 mHz).
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