A column of grey and brown ash billows up through a round hole in the cloud cover. The smooth white cloud is caused by condensed air created from the rapid rising and then cooling of the air directly above the ash column

This white cap is called a pileus cloud.
The eruption, which began a week ago, is ongoing. The ISS has been tracking the ash cloud since it is only a few handred miles from one of the world's busiest air corridors and flights have been diverted to avoid sucking the abrasive ash into aircraft engines.
1 comment:
The Astronomy picture of the Day website had this image in 3D but I didnt' have any red/green glasses to look at it and get the full benefit.
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