Thanks Carl, Oh yes i'm familiar with the theories presented to date... combinations of convection, conduction and radiation....
To say it's "well understood" is misleading. Coronal heating has no place in a fusion model of the sun... tis why you see the word 'surprise' and 'puzzle'.
http://imagine.gsfc.nasa.gov/docs/sc...l1/corona.html
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The problem is, no one can really explain how this corona exists. Even if the temperature in the core of the Sun does reach 15 million degrees, it drops to a mere 5000 degrees at the surface. The temperature should be even lower farther away from the Sun, but the temperature of the corona is measured at more than a million degrees.
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Yes they are now recognizing magnetic field interactions... one would then ask... what causes a magnetic field?
Heres another one for you...
Why is the neutrino flux inversely proportioned to the number of sun spots. That is to say... when there are holes in the surface of the sun, looking into the core... why do we see less neutrinos?