A corona is a type of plasma "atmosphere" of the Sun or other celestial body, extending millions of kilometres into space, most easily seen during a total solar eclipse, but also observable in a coronagraph. The Latin root of the word corona means crown. , as seen from France.]] The high temperature of the corona gives it unusual spectral features, which led some to suggest, in the 19th century, that it contained a previously unknown element, "coronium". These spectral features have since been traced to highly ionized Iron (Fe(XIV)) which indicates a plasma temperature in excess of 10^6 kelvin. Light from the corona comes from three primary sources, which are called by different names although all of them share the same volume of space. The K-corona (K for kontinuierlich, "continuum" in German) is created by sunlight scattering off free electrons; Doppler broadening of

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # TAGS