{"id":24064,"date":"2017-05-28T23:59:28","date_gmt":"2017-05-28T23:59:28","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=24064"},"modified":"2017-06-01T02:26:10","modified_gmt":"2017-06-01T02:26:10","slug":"eruption-of-bogoslof-in-alaskas-aleutian-islands","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/24064","title":{"rendered":"Eruption of Bogoslof in Alaska’s Aleutian Islands"},"content":{"rendered":"

\"Himawari-8<\/a>

Himawari-8 Visible (0.64 \u00b5m, left) and Infrared Window (10.4 \u00b5m, right) images, with hourly surface and ship reports plotted in yellow [click to play animation]<\/p><\/div>The Bogoslof volcano in Alaska’s Aleutian Islands erupted around 2216 UTC<\/strong><\/a> on 29 May 2017. A comparison of Himawari-8 Visible (0.64 \u00b5m) and Infrared Window (10.4 \u00b5m) images (above; MP4<\/a>)<\/strong><\/em> showed the volcanic cloud as it drifted north\/northeastward.<\/p>\n

A very oblique view of the volcanic cloud was captured by Korean COMS-1 satellite at 2315 UTC (below)<\/strong><\/em>.<\/p>\n

\"COMS-1<\/a>

COMS-1 Visible (0.67 \u00b5m) images, with surface observations plotted in yellow [click to enlarge]<\/p><\/div>Himawaari-8 false-color images from the NOAA\/CIMSS Volcanic Cloud Monitoring<\/strong><\/a> site (below)<\/strong><\/em> revealed the initial signature of a volcanic cloud — however, this signature became less distinct after about 02 UTC on 29 May.<\/p>\n

\"Himawari-8<\/a>

Himawari-8 false-color RGB images [click to play animation]<\/p><\/div>A different type of Himawari-8 false-color imagery (below)<\/strong><\/em> makes use of the 8.5 \u00b5m spectral band, which can help to infer the presence of sulfur dioxide within a volcanic cloud feature. A similar 8.4 \u00b5m<\/strong><\/a> band is available from the ABI<\/strong><\/a> instrument on the GOES-R<\/strong><\/a> series of satellites.<\/p>\n

\"Himawari-8<\/a>

3Himawari-8 false-color images [click to play animation]<\/p><\/div>A blend of Himawari-8 Infrared Window (10.4 \u00b5m) 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)<\/em>. 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.<\/p>\n

\"Himawari-8<\/a>

Himawari-8 Infrared Window (10.4 \u00b5m) images and Ash Cloud Height retrievals [click to play animation]<\/p><\/div>\n

A DigitalGlobe WorldView image at 2234 UTC (below)<\/em><\/strong> provided remarkable detail of the Bogoslof volcanic cloud shortly after the eruption began.
\n

<\/p>\n
\n

#Bogoslof<\/a> May 28 eruption. Img data via Digital Globe NextView License Img by Dave Schneider @USGSVolcanoes<\/a>\/ AVO. https:\/\/t.co\/sHzj0YLHTk<\/a> pic.twitter.com\/TJ04DGu0TN<\/a><\/p>\n

— Alaska AVO (@alaska_avo) May 30, 2017<\/a><\/p><\/blockquote>\n