Fig. 4


Download original image

Automated PIL identification in a photospheric longitudinal magnetogram of NOAA 12253, observed by SDO/HMI on 2 January 2015. The identified PILs in the region are further characterized as “moderate” (yellow contours) and “strong” (red contours). The difference between “strong” and “moderate” PILs relies on the absolute value of the gradient of the vertical magnetic field (>40 G/pixel and >16 G/pixel, respectively) and the strength of the horizontal field (>120 G and >100 G, respectively). Parts of the PIL that are not highlighted in color are below one or both thresholds and are considered as “weak”. The algorithm used is the FLARECAST PIL identification code, accessible as described in Appendix A.2.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.