Fig. 8
a) Comparison of helicity flux calculated from DAVE4VM (estimating v, Eq. (1)) and DAVE (estimating u, Eq. (3)). The general behavior and the sign reversal at 19T22:00 UT found with DAVE is similar to that found with DAVE4VM. b) Comparison of the accumulated helicity in the AR coronal part since the middle of 16 Dec. as computed with Eq. (9) and normalized by Φ2, which has the same units as helicity, where Φ is the mean of positive and negative magnetic fluxes.
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