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Hungarian Bishop's Ring seen Sept 6-7, '08 by Ágnes Kiricsi from Vecsés and Kékesteto.Image ©Ágnes Kiricsi, shown with permission.

Bishop rings (recent German ring) are a form of corona produced by very small droplets or particles for example wind blown Sahara sand, volcanic ash or forest fire smoke. The smaller the particles, the larger is the corona or ring. The centre is characteristically bluish.