<P> A corona (Latin,' crown') is an aura of plasma that surrounds the Sun and other stars . The Sun's corona extends millions of kilometres into outer space and is most easily seen during a total solar eclipse, but it is also observable with a coronagraph . The word corona is a Latin word meaning "crown", from the Ancient Greek κορώνη (korōnè, "garland, wreath"). </P> <P> Spectroscopy measurements indicate strong ionization and plasma temperature in excess of 1,000,000 kelvin s, much hotter than the surface of the Sun . </P> <P> Light from the corona comes from three primary sources, from the same volume of space . The K - corona (K for kontinuierlich, "continuous" in German) is created by sunlight scattering off free electrons; Doppler broadening of the reflected photospheric absorption lines spreads them so greatly as to completely obscure them, giving the spectral appearance of a continuum with no absorption lines . The F - corona (F for Fraunhofer) is created by sunlight bouncing off dust particles, and is observable because its light contains the Fraunhofer absorption lines that are seen in raw sunlight; the F - corona extends to very high elongation angles from the Sun, where it is called the zodiacal light . The E-corona (E for emission) is due to spectral emission lines produced by ions that are present in the coronal plasma; it may be observed in broad or forbidden or hot spectral emission lines and is the main source of information about the corona's composition . </P>

What is the temperature of the corona of the sun