The Solar corona - why is it so hot?

Scientists have never understood why the atmosphere of the Sun (corona), has a temperature that rises to millions of degrees. Now there is a better understanding of the cause.
The Sun produces many X-ray Jets that heat the Solar Corona

http://science.nasa.gov/headlines/y2007/06dec_xrayjets.htm

12/07/07
(E.O.A.S.)1 Students will gain a better understanding of the heating process around the sun and how the solar corona has become so hot compared to the sun surface etc