North Sea Green Flash
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Green flash at De Panne, Belgium . A frame from the sequence imaged by Forian Schaaf on 31st March '03. The I-Mir flash (close up) is produced by a layer of warm air just above the sea. Clear air is necessary for the most brilliant green flashes but clear skies are not. Here the sky is covered by high cloud but this does not overly influence the flash. Image ©Florian Schaaf, shown with permission.