A fully developed corona is perhaps the finest form of aurora.
In architecture, the term "corona" is used of that part of a cornice which projects over the bed mould and constitutes the chief protection to the wall from rain; it is always throated, and its soffit rises towards the wall.
These coronagraphs produce images of the " emission line corona.
The corona is very faint relative to the main body of the sun.
A superb image of the sun's corona, captured during the 1999 total eclipse.