A stalk-like prominence rose up above the sun, then split into roughly four strands that twisted themselves into a knot and dispersed over a two-hour period (July 12, 2011).

A NASA satellite has caught a stunning, yet eerie, video of a huge plasma twister rising up from the surface of the sun.

The video, taken by the Solar Dynamics Observatory, shows a plasma eruption that swirls up like a tornado to a dizzying height of up to 93,206 miles (150,000 kilometers) above the solar surface.

“Its height is roughly between 10 to 12 Earths,” solar astrophysicist C. Alex Young of NASA’s Goddard Space Flight Center in Greenbelt, Md., told SPACE.com.

The solar twister occurred on July 12 when an eruption of magnetic plasma, called a prominence, spiraled up from the sun in a graceful whirlwind, then split into four separate strands that twisted into a knot before fading away. The entire event lasted just a few hours.

Young said the ethereal twister look of the prominence was largely a matter of perspective. The Solar Dynamic Observatory was seeing the eruption from an angle that caught the prominence’s rise up from the solar surface.

“It would probably look much more normal, like a loop … kind of fill up like a loop and then fall back down,” Young said. “It’s not uncommon that we see this kind of helical-twisting structure.”

Prominences occur when material erupts along magnetic field lines that briefly extend out beyond the solar surface as the sun rotates on its axis.

“It’s kind of like having rubber bands and you’re twisting them, and they sort of bunch up and get knotted,” Young said. “The same thing is happening in the sun’s magnetic field.”

Source:
Massive Sun ‘Twister’ Swirls Up 12 Earths High
Live Science, 29 July, 2011

Category: Science, Weekend

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