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Etna volcano: smoke (steam) rings from New SE crater

After the violent paroxysm during 10-11 Nov 2013, the New SE crater continued to produce regular explosions, and, to our great surprise, we could observe during the afternoon of 11 Nov, that it often made fantastic vortex rings (steam rings or "smoke rings") that were blown eastward by strong Ponente.
Most likely, the eruption had changed the morphology of the vent into a way (into a particularly well circularly shaped form?) that allowed it to produce this rare phenomenon. And being Etna, she exaggerates: not only one ring every now and then, but she made dozens if not hundreds during a few hours, often in a row.
The next afternoon (12 Nov), the upper slopes of Etna are all white with snow. The main phase of the paroxysm is over, but explosions every minute or so continue at the NSEC. Interestingly, many of them produce steam rings, often in a row. (Photo: Tom Pfeiffer)
The next afternoon (12 Nov), the upper slopes of Etna are all white with snow. The main phase of the... [info]
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Strong Ponente wind pushes a thick cloud over the western part of the volcano, but leaves the Valle del Bove clear. A steam ring drifts in the sky. (Photo: Tom Pfeiffer)
Strong Ponente wind pushes a thick cloud over the western part of the volcano, but leaves the Valle ... [info]
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A perfectly circular steam ring vortex detaches from the steam plume of the explosion that created it. (Photo: Tom Pfeiffer)
A perfectly circular steam ring vortex detaches from the steam plume of the explosion that created i... [info]
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Zoom onto the rotating steam ring. (Photo: Tom Pfeiffer)
Zoom onto the rotating steam ring. (Photo: Tom Pfeiffer) [info]
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A freshly "born" steam ring (right) drifts ahead of another one in the making (left). (Photo: Tom Pfeiffer)
A freshly "born" steam ring (right) drifts ahead of another one in the making (left). (Photo: Tom Pf... [info]
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The rotation of the vortex can be seen in this picture in the sideways perspective of another steam ring. (Photo: Tom Pfeiffer)
The rotation of the vortex can be seen in this picture in the sideways perspective of another steam ... [info]
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Not all rings are perfectly flat. This one is more irregular. (Photo: Tom Pfeiffer)
Not all rings are perfectly flat. This one is more irregular. (Photo: Tom Pfeiffer) [info]
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"Failed attempt" (right) and successful blow-out plume from two explosions. See the result in the next picture. (Photo: Tom Pfeiffer)
"Failed attempt" (right) and successful blow-out plume from two explosions. See the result in the ne... [info]
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Very narrow and irregular vortext ring. (Photo: Tom Pfeiffer)
Very narrow and irregular vortext ring. (Photo: Tom Pfeiffer) [info]
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The New SE crater itself is only rarely visible. Here, it just had produced two explosions, each creating rings. (Photo: Tom Pfeiffer)
The New SE crater itself is only rarely visible. Here, it just had produced two explosions, each cre... [info]
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Sometimes, several rings (each from a small explosion) drift eastwards over the Valle del Bove in a row. (Photo: Tom Pfeiffer)
Sometimes, several rings (each from a small explosion) drift eastwards over the Valle del Bove in a ... [info]
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A "smaller" (but still tens of meters wide) ring in the sky. (Photo: Tom Pfeiffer)
A "smaller" (but still tens of meters wide) ring in the sky. (Photo: Tom Pfeiffer) [info]
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