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Two
coronas. The smaller bright red rimmed
aureole is made by water droplets in the visible tropospheric
cloud. The outer glow pervading almost the whole of the image
is a Bishop's
ring produced by ash and hydrated sulfate particles injected
into the stratosphere by the eruption of Mount Pinatubo. Bob Harrington
(site) took
this late one afternoon in the early 90s in the Pacific Northwestern
USA. Another Bishop's Ring. Pinatubo
sunset over Puget Sound. Image
©2004 Bob Harrington, reproduced with permission. |
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