The National Geographic are reporting that parts of the sun are hotter due to sound waves produced by magnetic fields.

The temperature at the sun’s surface layer, or photosphere, is about 10,000°F (6,000°C)—much cooler than its 27,000,000°F (15,000,000°C) interior.
But in the chromosphere, the region just above the photosphere, the heat spikes again to about 20,000°F (11,000°C)…

Now McIntosh and colleagues’ studies show that magnetic fields send sound waves from the sun’s interior shooting upward, creating fountains of hot gas that shape and power the chromosphere.