K Corona. (from "Kontinuum")

Of the white light corona (that is, the corona seen by the eye at a total solar eclipse), that portion which is caused by sunlight scattered by protons and free electrons in the hot outer atmosphere of the Sun. The K corona extends out to about 700,000 km from the photosphere . The K Corona's continuous spectrum resembles the photospheric spectrum, but the Fraunhofer lines are absent.