(Click Image to Enlarge)From Discovery News:
The solar corona is the magnetically dominated atmosphere of the sun, reaching millions of miles into space. Paradoxically, the corona is many times hotter than the solar 'surface' (the photosphere) and solar physicists are currently trying to understand why this is the case.
The photosphere has an average temperature of approximately 6000 degrees Celsius, whereas the corona can be millions of degrees Celsius. This is analogous to the air surrounding a hot light bulb being hotter than the bulb itself; in reality, the air surrounding the bulb is cooler than the bulb's glass surface, and it gets cooler the further you move your hand away.
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