Where and why on the Sun the temperature reaches hundreds of thousands of degrees?

In the convective zone of the Sun at a depth of 100-200 thousand kilometers, the temperature ranges from 10,000 to a million degrees, which is explained by the proximity to the hotter core. Temperatures of hundreds of thousands of degrees are also observed over the visible surface of the Sun in the chromosphere and the lower layers of the corona. The rise in temperature occurs as a result of shock waves in the tenuous atmosphere of the Sun.

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