kromosfääri

The chromosphere is a layer of the Sun's atmosphere that lies above the photosphere and below the corona. It is visible during a total solar eclipse as a reddish glow, which gives the chromosphere its name, derived from the Greek word "chroma" meaning color. This layer is characterized by its temperature increasing with altitude, a phenomenon that is the opposite of the photosphere.

The chromosphere is a dynamic region, exhibiting various phenomena such as spicules, which are jet-like eruptions of plasma extending outwards from the Sun's surface. It is also home to solar flares and prominences, large loops of plasma that extend outward from the Sun's surface and are often anchored to the chromosphere. The density of the chromosphere is much lower than that of the photosphere, but it is still dense enough to emit visible light, particularly in the red and blue parts of the spectrum.

Observations of the chromosphere provide valuable insights into solar activity and the Sun's internal processes. Its study helps scientists understand the mechanisms driving solar flares, the formation of solar prominences, and the heating of the solar corona. The chromosphere acts as a transition zone, connecting the cooler, denser photosphere to the extremely hot and tenuous corona.