Volcanic steam ring

Numéro d’image : 11650910
Volcanic steam ring
Volcanic steam ring. Sun,steam and a steam ring after being blown from the Bocca Nuova vent of Mount Etna,a volcano on the Italian island of Sicily. Steam rings are generated when a pulse of steam is ejected from a near-cylindrical volcanic vent. The steam in the centre of the pulse is propelled by thermal forces,whereas the steam at the edge of the ring suffers drag from the surrounding air. This drag rotates the steam and forms this annular (ring- shaped) vortex that can remain stable for several minutes. This is directly analogous to blowing smoke rings
Licence : Droits gérés
Crédit: Science Photo Library / Alean, Dr. Juerg
Taille de l’image : 3543 px × 2506 px
Model Release : Non requis
Property Release : Non requis
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