Brightness temperature difference between VIIRS channels M-12 and M-15 from 14:41 UTC 5 June 2012 Published June 8, 2012 at 1258 × 938 in Cape Verde Waves and Plumes Brightness temperature difference between VIIRS channels M-12 and M-15 from 14:41 UTC 5 June 2012 Brightness temperature difference between VIIRS channels M-12 and M-15 from 14:41 UTC 5 June 2012.