The two competing theories trying to explain the Coronal heating problem are the Wave heating theory, proposed by Alan Hood, and the theory of magnetic twisting, proposed by Harrison. i'm going to bet for Hood's theory
spicules, lurking ... er ... above?
"These images also indicate, for the first time, that the ultimate cause of spicules is sound-like waves that flow over the Sun's surface but leak into the Sun's atmosphere" from APOD
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