Polarity Inversion Line detection module
SDO FFT polarity inversion line (PIL) detection module movie
(Engell): This module finds and draws PILs from HMI magnetograms. The yellow lines represent the PILs. Red boxes delineate Active Regions. PILs with very large horizontal field gradients, prone to flaring, are drawn in red. The green is high gradient associated to potential field extrapolations.
