Fig. 6
Helicity density map obtained using the DAVE method for the velocity measures and the Pariat method for the helicity computation. The map corresponds to Oct. 29 at 20:47 UT. The field of view is ~280 × 280 Mm2 and is corrected for the projection effects by applying a standard differential rotation rate (Howard et al. 1990). North is at the top and west to the right.
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