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Analysis Algorithm For Sky Type And Ice Halo Recognition In All-Sky Images, Sylke Boyd, Stephen Sorenson, Shelby Richard, Michelle King, Morton Greenslit
Analysis Algorithm For Sky Type And Ice Halo Recognition In All-Sky Images, Sylke Boyd, Stephen Sorenson, Shelby Richard, Michelle King, Morton Greenslit
Physics Publications
Halo displays, in particular the 22∘ halo, have been captured in long time series of images obtained from total sky imagers (TSIs) at various Atmospheric Radiation Measurement (ARM) sites. Halo displays form if smooth-faced hexagonal ice crystals are present in the optical path. We describe an image analysis algorithm for long time series of TSI images which scores images with respect to the presence of 22∘ halos. Each image is assigned an ice halo score (IHS) for 22∘ halos, as well as a photographic sky type (PST), which differentiates cirrostratus (PST-CS), partially cloudy (PST-PCL), cloudy (PST-CLD), or clear (PST-CLR) within …