An Etymological Dictionary of Astronomy and Astrophysics
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The inner part of the → solar corona which extends to about two solar radii. It is due to the → Thomson scattering of light from the → photosphere by the free electrons in the corona. The K corona exhibits a → linearly polarized continuous spectrum. The high speeds of the scattering electrons (on the average 10,000 km s^-1 for a temperature of 2 million K) smear out the → Fraunhofer lines except the → H and K lines.

K from Ger. Kontinuum, → continuum; → corona.