Fourier power map (power in logarithmic scale) of south polar coronal hole obtained from 171 Å (left panels) and 193 Å passbands (right panels) of AIA/SDO in different period ranges as labelled. White line contours are plotted at the same Fourier power level (≈1.7 in log scale) in all the panels of 171 Å and 193 Å passbands. Location of solar limb is also over-plotted with continuous yellow line in all the panels.