a), b) Power spectra of the time series (1998-07-03 00:47–09:00 UT) of a macro-pixel (3 × 3 pixels) situated along the mid-way of the slit (Fig. 1b in EUV 171 Å (left) and 195 Å (right). c), d) The corresponding spectra of an enlarged macro-pixel (20 × 20 pixels). e), f) The power spectra after filtering out the orbital frequencies. g) The power spectrum of NoRH 17 GHz radio emission, (1998-07-03 02:55–06:30 UT). The vertical dot-dot-dashed lines are the orbital frequency and its higher harmonics. A horizontal dashed line indicates the 99% confidence level in all the panels (see Sect. 2.4). The detected peaks in all the bandpasses are summarised in Table 1.
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