Surprising Answer to 400-year-old Sun Mystery May Help Predict Solar Storms

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Sun's magnetic field may be generated near its surface, in contrast to previous models that assumed it was generated deep inside our star.

Scientists may have taken one step closer to solving a centuries-old conundrum about the sun's magnetic field.The sun's powerful magnetic field is responsible for the sunspots that spit out dramatic solar flares and coronal mass ejections, but solar scientists have been puzzled over how deep into our star the magnetic field reaches.

'The winds in the Sun get stronger the deeper you go until you reach a depth of about 5 percent. The difference in the wind speed at the surface vs deeper into the Sun can amplify magnetic fields via a process known as the 'magnetorotational instability.''This process is well-known in astrophysics as a way of explaining the behavior of plasma orbiting black holes, but had not been thought to be important in the sun until this work, Lecoanet said.

 

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