![]() ![]() ![]() The photosphere is the visible "surface" of the Sun. Outside eclipses it is visible in the monochromatic light of hydrogen atoms (the H-alpha spectral line). Immediately before and after a total solar eclipse, the chromosphere is visible as a crescent or diamond ring, of reddish colour. Over this distance, the temperature of the chromosphere increases from 4300 degrees to more than 400,000 degrees. It extends from a few hundred kilometers above the top of the photosphere and outwards to a height of about 2000 km where it merges with the corona. The chromosphere (which means "coloured sphere") is a transparent layer, just above the photosphere. Professional astronomers have developed a special telescope, a so-called coronograph that makes it possible to see and photograph the corona, also outside solar eclipses. Although as bright as the full Moon, the corona is normally "drowned" in the sunlight that is scattered in the Earth's atmosphere - the daytime sky near the Sun is simply too bright to see the surrounding corona.ĭuring a total solar eclipse, the Moon blocks the light from the solar photosphere, and the sky is sufficiently dark for the corona to become visible. You can only see the corona directly during a total solar eclipse. It is an extremely hot zone with temperatures reaching up to about 2 million degrees this is caused by the transport of energy from the layers below by means of magnetic fields. The corona (which means "crown") is the outer shell of the Sun's atmosphere. Photo of the Sun's corona, obtained during the solar eclipse on Aug(Philippe Duhoux - ESO) There is access to recent solar images (from ground-based telescopes and SOHO), via the dedicated webpage at the Observatoire de Paris. the core - the innermost region of the Sun's interior.the radiative zone - the middle "layer" of the Sun's interior.the convective zone - the uppermost "layer" of the Sun's interior.the various phenomena in the atmosphere, like "flares" and "prominences".the sunspots - dark areas on the photosphere, which are cooler than the surroundings.the photosphere - the visible "surface" of the Sun.the chromosphere - a transparent layer between the corona and the photosphere.the corona - the outermost, hot shell of the atmosphere.It is a huge, luminous ball of gas like other stars in the Universe. Mercury Transit on Information about the Sun ![]()
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