Things are heating up again

Above the chromosphere is a very thin layer of the Sun's atmosphere about 100 km thick over which the temperature rises drastically from 20,000 degrees Kelvin in the upper chromosphere to over 2 million degrees Kelvin in the corona. This region is called the transition region.

Researchers still do not understand why the temperature rises so much in these outermost layers of the Sun which are far from the heat producing core. It is suspected that the complicated structure of the Sun's magnetic field may provide clues to the dramatic increase in temperature over such a small change in radius.


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