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Eruption of Anak Krakatau in Indonesia

By Scott Bachmeier •

10-minute Himawari-9 Ash RGB images, from 1500 UTC on 04 September to 0620 UTC on 05 September

JMA Himawari-9 Ash RGB images created using Geo2Grid (above) showed a major eruption of Anak Krakatau in Indonesia, which began around 1620 UTC on 04 September 2026. A lower-altitude ash cloud (depicted by shades of magenta) remained closer to the volcano — while a higher-altitude SO2 cloud (shades of yellow-green) moved rapidly west-southwestward.

Large #eruption of #Krakatau #volcano (#Indonesia) started at ~16:30 UTC on Sept 4, and is continuing as of 13:00 UTC on Sept 5. #NOAA-20 OMPS satellite data showing injection of ~0.2 Tg SO? into the upper troposphere by 06:50 UTC on Sep 5.

— Prof. Simon Carn (@simoncarn.bsky.social) 2026-09-05T13:45:18.892Z

After sunrise on 05 September, Himawari-9 True Color RGB images (below) showed the lower-altitude ash cloud as shades of brown, with pulses of higher-altitude volcanic cloud (a mixture of water vapor, ash and SO2) moving quickly westward away from the volcano. The lower-altitude ash caused the suspension of numerous flights at Jakarta International Airport (located east of the volcano).

10-minute Himawari-9 True Color RGB images, from 0000-1000 UTC on 05 September

Categories: Geo2Grid, Himawari-9, Red-Green-Blue (RGB) images, Volcanic activity