Articles | Volume 10, issue 7
https://doi.org/10.5194/amt-10-2499-2017
https://doi.org/10.5194/amt-10-2499-2017
Research article
 | 
17 Jul 2017
Research article |  | 17 Jul 2017

Ice crystal characterization in cirrus clouds: a sun-tracking camera system and automated detection algorithm for halo displays

Linda Forster, Meinhard Seefeldner, Matthias Wiegner, and Bernhard Mayer

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Short summary
Halo displays are produced by scattering of sunlight by smooth, hexagonal ice crystals. Consequently, the presence of a halo should contain information on particle shape. This study presents HaloCam, a novel sun-tracking camera system, and an automated detection algorithm to collect and evaluate long-term halo observations. Two-year HaloCam observations revealed that about 25 % of the detected cirrus clouds occurred together with a 22° halo indicating the presence of smooth, hexagonal crystals.