Why the Sun’s Corona is So Much Hotter than Its Surface

One of the most enduring mysteries in solar physics is why the Sun’s outer atmosphere, or corona, is millions of degrees hotter than its surface.

Now scientists believe they have discovered a major source of hot gas that replenishes the corona: jets of plasma shooting up from just above the Sun’s surface.

Longstanding mystery of Sun’s hot outer atmosphere solved

Image credit: NASA

Update: also here:  BBC News – Jets implicated in solar riddle

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