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Fig. 1

image

Left: SDO/HMI line-of-sight magnetogram of the analysed magnetic structure, measured at 23:00:45 UT on the 6th July 2013. Blue contours show the magnetic field intensity levels of 70 (dash), 100 (solid) and 600 (dash) G. Right: temporal variations of the average line-of-sight component of the magnetic field (blue) in the structure, integrated over the whole 100 G contour. The red solid line shows the long-term trend of the blue signal, determined as the last empirical mode with EMD (see Sect. 3). Variations of the total area inside the 100 G contour are shown by the black solid line, with the long-term trend (green line) determined also with EMD. Both original time-series were normalised to their maximum values (shown in arbitrary units), and the total area signal was slightly shifted downwards for a better visualisation. The elapsed time starts at 23:00:45 UT on the 6th July 2013 and spans 13 h of observations with a cadence of 45 s.

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