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Stars and solar physics

Stars and solar physics

The enduring mystery of the solar corona

16 Sep 2021
Taken from the September 2021 issue of Physics World.

Physicists have long known that the Sun’s magnetic fields make its corona much hotter than the surface of the star itself. But how – and why – those fields transport and deposit their energy is still a mystery, as Philip G Judge explains

solar corona during an eclipse
Sunny times The solar corona photographed by Andreas Möller during the 2020 total eclipse over Argentina (image processing by Miloslav Druckmüller), showing plasma outflowing to space, bright loops and a coronal mass ejection. (Courtesy: Miroslav Druckmüller, Andreas Möller)
Look towards the Sun during a total solar eclipse (taking proper precautions of course) and you’ll

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