Coronal heating problem
Why is the Sun’s corona hundreds of times hotter than its surface?
Summary
The corona reaches millions of kelvin above a surface of about 5,800 K, and how it is heated is unresolved.
Source
Open, as listed by Wikipedia · Unsolved problems in astronomy. Checked 29 Sep 2026.
The status is the source’s. Papex does not decide whether a problem is solved.
Records on this problem
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