Eruption of Bogoslof in Alaska’s Aleutian Islands
Himawari-8 Visible (0.64 µm, left) and Infrared Window (10.4 µm, right) images, with hourly surface and ship reports plotted in yellow [click to play animation]
A very oblique view of the volcanic cloud was captured by Korean COMS-1 satellite at 2315 UTC (below).
Himawaari-8 false-color images from the NOAA/CIMSS Volcanic Cloud Monitoring site (below) revealed the initial signature of a volcanic cloud — however, this signature became less distinct after about 02 UTC on 29 May. A different type of Himawari-8 false-color imagery (below) makes use of the 8.5 µm spectral band, which can help to infer the presence of sulfur dioxide within a volcanic cloud feature. A similar 8.4 µm band is available from the ABI instrument on the GOES-R series of satellites. A blend of Himawari-8 Infrared Window (10.4 µm) and radiometrically-retrieved Ash Cloud Height is shown below; the maximum ash cloud height was generally in the 10-12 km (33,000-39,000 feet above sea level) range (dark blue color enhancement). A volcanic ash signal was no longer apparent after 2320 UTC — this was likely due to enhanced ash particle removal via water (both liquid and ice) related processes.![Himawari-8 Infrared Window (10.4 µm) images and Ash Cloud Height retrievals [click to play animation]](https://cimss.ssec.wisc.edu/satellite-blog/wp-content/uploads/sites/5/2017/05/HIMAWARI-8.AHI.2017-05-28_22-40-00.Ash_Height.Aleutians_East_1_km.png)
Himawari-8 Infrared Window (10.4 µm) images and Ash Cloud Height retrievals [click to play animation]
A DigitalGlobe WorldView image at 2234 UTC (below) provided remarkable detail of the Bogoslof volcanic cloud shortly after the eruption began.
#Bogoslof May 28 eruption. Img data via Digital Globe NextView License Img by Dave Schneider @USGSVolcanoes/ AVO. https://t.co/sHzj0YLHTk pic.twitter.com/TJ04DGu0TN
— Alaska AVO (@alaska_avo) May 30, 2017