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Alfecca Meridiana is the name of the star alpha Coronae Australis in the constellation southern crown. Alfecca Meridiana belongs to the spectral class A2V and possesses an apparent brightness of +4,11 mag. It is distant 100 light-years from the earth.
An interesting feature of the corona is the fact that it is much hotter (by a factor of nearly 200) than the visible "surface" of the Sun: the photosphere The photosphere of an astronomical object is the region at which the optical depth becomes one.
However, during the Sun's active periods, the corona is evenly distributed over the equatorial and polar regions, though it is most prominent in areas with sunspot A sunspot is a region on the Sun's surface (photosphere) that is marked by a lower temperature than its surroundings, and intense magnetic activity.
The first direct observation of waves propagating into and through the solar corona was made in 1997 with the SOHO space-borne solar observatory, the first platform capable of observing the Sun in the extreme ultraviolet for long periods of time with stable photometry.
CoronaAustralis is a small constellation 128 sq° in area, composed of a graceful arc of 4th and 5th magnitude stars, directly east of the "Tail" of Scorpius.
Alpha and beta are the two brightest stars, both magnitude 4.1 and found in the north eastern quadrant of CoronaAustralis.
The CoronaAustralis molecular cloud that pervades this region is one of the nearest clouds of its type at an average distance of 130 parsecs (Marraco and Rydgren 1981), around 420 light years, though this figure is still uncertain.
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