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Comment by slavik81

4 days ago

Could you elaborate on how magnetic fields cause instabilities? As a layman, it's not immediately obvious to me why that would be the case.

Because the plasma itself is charged and moves within the field, generating eddy currents which self-interact in complex and unpredictable ways. At a much much larger scale, the twisting of magnetic fields from convection within the sun causes sunspots and other phenomena around the solar surface.