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The Vector Spectromagnetograph (VSM) of the NSO's Synoptic Optical Long-TermInvestigations of the Sun (SOLIS) facility is now operational and obtains thefirst-ever vector magnetic field measurements of the entire visible solarhemisphere. To fully exploit the unprecedented SOLIS/VSM data, however, onemust first address two critical problems: first, the study of solar activeregions requires an automatic, physically intuitive, technique foractive-region identification in the solar disk. Second, use of active-regionvector magnetograms requires removal of the azimuthal $180^o$-ambiguity in theorientation of the transverse magnetic field component. Here we report on aneffort to address both problems simultaneously and efficiently. To identifysolar active regions we apply an algorithm designed to locate complex,flux-balanced, magnetic structures with a dominant E-W orientation on the disk.Each of the disk portions corresponding to active regions is thereafterextracted and subjected to the Nonpotential Magnetic Field Calculation (NPFC)method that provides a physically-intuitive solution of the 180-degreeambiguity. Both algorithms have been integrated into the VSM data pipeline andoperate in real time, without human intervention. We conclude that thiscombined approach can contribute meaningfully to our emerging capability forfull-disk vector magnetography as pioneered by SOLIS today and will be carriedout by ground-based and space-borne magnetographs in the future.

Automatic Active-Region Identification and Azimuth Disambiguation of the SOLIS/VSM Full-Disk Vector Magnetograms