Cool Sun, hot solar atmosphere
Name: Doug A Foster
Why does the temperature of the Sun cool off from the core to the surface
and then get so hot again in the atmosphere?
The first part is pretty simple. The sun's furnace is near the center.
That is because the gravitational pressure there is so high that thermonu-
clear burning takes place. The further one gets from the center then the
cooler the solar material.
The second part is more complicated. There is a lot of funny stuff that
occurs on the surface that involves very strong magnetic fields and a lot of
stirring. The result is that occasional hot spots flare up and shoot "hot"
material outward from the Sun.
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Update: June 2012