Solar prominences are visible during this phase of the eclipse and appear as bright plumes of fire ejecting themselves off the surface of the Sun. This eclipse, they were very active. These are actually plasma material shooting into the Suns atmosphere, the pink color seen is fluorescing hydrogen gas, just in the right temperature and density to give us this pinkish color. They can reach near 500,000 miles long, and are part of the activity that contributes to the Northern Lights we see from Earth.
To learn more about solar prominence, check out this article from Earth Sky.