Sample of the steps followed in the analysis of the MDI magnetograms taken on Oct. 20, 2000, at 00:00 UT and at 01:36 UT for AR 9201. a) Average magnetogram corresponding to 00:48 UT on Oct. 20, 2000. Black and white correspond to negative and positive magnetic field, respectively. The saturation levels are ± 1000 G; b) the arrows indicate the horizontal velocities measured by means of the DAVE method. The background image is the average magnetogram showed in a); c) helicity flux density map computed with the method of Pariat et al. (2005). Black and white correspond to negative and positive helicity flux density, respectively. The saturation levels are ± 5 × 1018 Mx2 cm-2 s-1; d) elements of helicity flux determined by the YAFTA feature-tracking algorithm. The identified patches are numbered progresssively. The background image is the helicity flux density map showed in c) with saturation levels of ± 2 × 1018 Mx2 cm-2 s-1. The field of view is of about 210 × 140 arcsec2.
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