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).
The aurora borealis and aurora australis occur in the Ionosphere from around 100 km up. This layer of the atmosphere is also called the Thermosphere.n the upper mesosphere and the lower thermosphere, gas particles become electrically charged. Because these charged particles are called ions, this part of the thermosphere i â¦ s called the ionosphere. In polar regions these ions radiate energy as shimmering lights called auroras, usually in latitudes above 50 degrees.