Coronal Loops
"Magnetism made visible: That describes virtually every feature on the sun, from sunspots to these soaring structures, called loops. Loops easily reach the height of ten Earths. Energy generated by the dynamics of smaller loops is likely the source of the solar corona's mysterious heat."
Solar Corona
Solar Corona, from satellite X-rays of the sun
"Why is the halo-like corona, visible from Earth only during a total eclipse, hundreds—even thousands—of times hotter than the sun's surface? That's one of the questions that keep scientists looking straight at the sun."
National Geographic
University of California Dept. of Mathematics
The Telegraph
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