Fig. 4.
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AIA (193 Å) images from SDO for events 1 to 4 (left to right, then top to bottom). The CHs are the darker regions visible and marked in the EUV wavelengths. The red and blue squares indicate the specific CH where a positive and negative polarity is expected, respectfully. The figures are made with Helioviewer (Helioviewer Project 2023). More information about the events can be found in Table 1.
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