The shadow of an eclipse travels fast enough that it creates a bow wave in the atmosphere—the same idea as the trailing v-shaped waves left behind by boats travelling in water.
from gizmodo http://www.gizmodo.co.uk/2017/12/the-august-eclipse-left-a-wake-in-the-earths-upper-atmosphere/
from gizmodo http://www.gizmodo.co.uk/2017/12/the-august-eclipse-left-a-wake-in-the-earths-upper-atmosphere/
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