Actually, core temp is about 15million K and there's nothing crazy about those numbers at all. In any case, there's no way you're going to directly measure the core temp of the Sun.
Also, the Sun is full of sound waves.
It's also a magnetohydrodynamic cauldron as well. You can't separate out one particular process and say its the dominant one, because in a body like the Sun, there are a number of equally important processes going on.
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