Bishop's ring and corona

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.