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An Overlooked Piece of the Solar Dynamo Puzzle

30 Oct 2019, 22:12 UTC
An Overlooked Piece of the Solar Dynamo Puzzle
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A previously unobserved mechanism is at work in the Sun's rotating plasma: a magnetic instability, which scientists had thought was physically impossible under these conditions. The effect might even play a crucial role in the formation of the Sun's magnetic field, say researchers from Helmholtz-Zentrum Dresden-Rossendorf (HZDR), the University of Leeds and the Leibniz Institute for Astrophysics Potsdam (AIP) in the journal Physical Review Fluids.Just like an enormous dynamo, the sun's magnetic field is generated by electric currents. In order to better understand this self-reinforcing mechanism, researchers must elucidate the processes and flows in the solar plasma. Differing rotation speeds in different regions and complex flows in the sun's interior combine to generate the magnetic field. In the process, unusual magnetic effects can occur - like this newly discovered magnetic instability.Researchers have coined the term "Super HMRI" for this recently observed special case of magnetorotational instability (MRI). It is a magnetic mechanism that causes the rotating, electroconductive fluids and gases in a magnetic field to become unstable. What is special about this case is that the Super HMRI requires exactly the same conditions that prevail in the plasma close to the solar equator - the place where astrophysicists observe the ...

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