CACTUS Detection Parameters
- thresh - [default: 0.3 (LASCO and secchi-a), 0.25 (secchi-b)]. A measure for the intensity threshold in the Hough space. Reasonable values are 0.2 to 0.4, the lower the value, the more CMEs (and noise) you will detect. If you set it too high, weak parts of bright CMEs will not be detected.
- factor - [default: 6] Additional constraint to avoid false detections when noise is high: intensity > factor*sigma. The cactus-catalog version 1 did not use this constraint.
- width - [default: 5] Minimal width of CMEs that will be reported (in degrees)
- maxniterations - [default: 300] Maximum number of iterations that will be performed in the Hough space. This value should be set higher for larger data-sets.
Simulations
- Runs simu01 to simu12 below use Simulations 1 to 17 respectively, all run with CACTUS settings threshold = 0.3 , factor = 2 , width = 5
- Run simu12a below used simulation 12 with CACTUS settings threshold = 0.3 , factor = 3 , width = 5
- Run simu12b below used simulation 12 with CACTUS settings threshold = 0.3 , factor = 3.5 , width = 5
- Run simu12c below used simulation 12 with CACTUS settings threshold = 0.3 , factor = 3.7 , width = 5
- Run simu04a below used simulation 04 with CACTUS settings threshold = 0.3 , factor = 3 , width = 5
- Run simu04b below used simulation 04 with CACTUS settings threshold = 0.3 , factor = 1 , width = 5
