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Eruptions on the sun's surface are probably caused by giant, unstable magnetic plasma arches, a new study reports — a discovery that brings scientists one step closer to predicting solar outbursts that can wreak havoc on Earth.
Astronomers have long observed gigantic arches of plasma emerging from the surface of the sun. Known as magnetic flux ropes, coronal loops and solar prominences, these structures possess spiraling magnetic field lines, as if a huge bar magnet had been twisted into a corkscrew. A vast amount of electric current typically runs through the core of each of these tubes.
Scientists have long thought magnetic flux ropes drive powerful solar explosions such as coronal mass ejections, or CMEs, which can spawn geomagnetic storms that damage satellites in space and disrupt power grids on Earth Read more...
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