PlzeÅ (Czech pronunciation: [ËplÌ©.zÉÉ²]), also called Pilsen in English and German, is a city in western Bohemia in the Czech Republic. About 90 kilometres (56 miles) west of Prague, it is the fourth most populous city in the Czech Republic.
The Chromosphere. Click on image for larger version. The chromosphere is an irregular layer above the photosphere where the temperature rises from 6000&degC to about 20,000&degC. At these higher temperatures hydrogen emits light that gives off a reddish color (H-alpha emission).
A Dancing. Views of the chromosphere show convective cell patterns similar to those in the photosphere, but much larger. This large scale convection is known as super-granulation. Another interesting feature of the chromosphere is its jagged outer layer which is constantly changing. The motion is much like flames shooting up several thousands of kilometers and then falling again. These spiky, dancing flames are called spicules and can be seen in the image to the right.