CH service title

*** SPoCA Coronal Hole *** This service provides a catalog of Coronal Holes obtained with the Spatial Possibilitistic Clustering Algorithm (SPoCA). Level 2 AIA 19.3nm images (calibrated and corrected for degradation) are used, at a cadence of one AIA image every 6 hours. Only coronal holes older than three days are being reported. Bounding box and characteristics such as areas and pixel intensity statistics, on AIA 19.3nm and HMI magnetogram images are provided.
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Acquisition start time (in JD), as UTC at time_refposition
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Acquisition stop time (in JD), as UTC at time_refposition
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This research has been made at the Royal Observatory of Belgium