VIIRS channel M-06 image, taken 22:23 UTC 30 October 2012 Published November 29, 2012 at 1172 × 1060 in The Case of the 100-year-old Ash Cloud VIIRS channel M-06 image, taken 22:23 UTC 30 October 2012 VIIRS channel M-06 image, taken 22:23 UTC 30 October 2012. The source region of volcanic ash from the 1912 eruption of Novarupta is highlighted.