*** 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.