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Fig. A.1.

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Latitudinal dependence of the phase of B avg + $ B_{\mathrm{avg}}^{+} $ relative to latitude 67.5°, measured during solar minimum (2018−2021) and at the frequency of the m = 1 high-latitude mode. The green shaded area highlights the latitude range where the phase varies smoothly. This coincides with the latitude range where the mode has the largest amplitudes in the power spectrum.

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