Science
The sun’s atmosphere is hundreds of times hotter than its surface – here’s why – The Conversation UK
Alfvén waves, first proposed 80 years ago, could explain why the sun’s atmosphere is so much hotter than its surface.
The visible surface of the sun, or the photosphere, is around 6,000°C. But a few thousand kilometres above it a small distance when we consider the size of the sun the solar atmosphere, also called the corona, is hundreds of times hotter, reaching a million degrees celsius or higher.
This spike in temperature, despite the increased distance from the suns main energy source, has been observed in most stars, and represents a fundamental puzzle that astrophysicists have mulled over for decades.
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