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Corona1. The outermost layer of the solar atmosphere, characterized by low densities (< 1.0x109/cc) and high temperatures (> 1.0x106 K).
2. In solar-terrestrial terms, a white or colored circle or set of concentric circles of light of small radius seen around a luminous body, especially around the sun or moon. The color varies from blue inside to red outside and the phenomenon is attributed to diffraction of light by thin clouds or mist (distinguished from halo).Coronal HoleIn solar-terrestrial terms, an extended region of the corona, exceptionally low in density
and associated with unipolar photospheric regions.Coronal Rain(Abbrev. CRN) In solar-terrestrial terms, material condensing in the corona and appearing to rain
down into the chromosphere as observed at the solar limb above strong sunspots.Coronal TransientsIn solar-terrestrial terms, a general term for short-time-scale changes in the corona, but principally used to describe outward-moving plasma clouds.F CoronaIn solar-terrestrial terms, 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 or reflected by solid particles (dust) in inter-planetary space.K CoronaIn solar-terrestrial terms, 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 electrons in the hot outer atmosphere of the sun.
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