Chromosphere

http://solar.physics.montana.edu/YPOP/Spotlight/SunInfo/Chromosph.html

The Solar chromosphere is the ~2000 km thick layer of the solar atmosphere above the (temperature-minimum) transition region and below the corona. Being transparent in the continuum, it is seen during eclipses as a bright red ring around the Sun. Energy is transported by radiative diffusion through the chromosphere, which reveals itself most strongly in the light of Ha and CaII K. Views of the chromosphere show convective cell patterns similar to those in the photosphere, but much larger. This large scale convection is known as super-granulation.

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