Cancellation analysis of current density in solar active region NOAA10019Gaetano De Vita, Antonio Vecchio, Luca Sorriso-Valvo, Carine Briand, Leonardo Primavera, Sergio Servidio, Fabio Lepreti and Vincenzo CarboneJ. Space Weather Space Clim., 5 (2015) A28DOI: https://doi.org/10.1051/swsc/2015029