This(corona temp) has never been a stump, secret or mystery for classical physics.
As for all the relatively small spins on the surface, the most likely cause is an electrical Coriolis effect.
Plasma currents have inertia, just like electrical currents do here. But the inertia is not a neutral inertia, like a bowling ball. This inertia has a handedness(expressed as reactance) with it. It interacts with an angle. Further generating spins. Plasma is a flux. And nothing hides discrete fundamentals better than a flux. A flux gives us false narratives even to this day.
Be wary of all flux analysis. And remember all science and academia products, are a result of probability. Statistics. Data patterns. We only have comparative knowledge. And we can only speculate on the cause and reason the comparison is so. And we speculate wildly. Because our only restriction at present is mathematics. Which has a wide and funky range.
Physically is much, much more restrictive. Because an amount of physicality has a rate of handedness, independent of the past or the future. All physical amounts.......is....a rate of handedness. That includes a propagation.
But these are the old classical concepts which have been dis-proven with math and no longer taught in our society. So we have a lot of mysteries today. Mysteries within mysteries tied in some kind of spacetime knot. An irritation that can not be scratched.