Blue, green, red. Twisting, diffuse or curtain-like… Auroras occur when the Earth’s magnetosphere traps or diverts the charged particles from the Sun.
The colour of polar lights (or auroras) teaches us something about the chemical elements in our atmosphere.
A multidisciplinary science based on observations of the atmospherical environment (terrestrial and extraterrestrial).
Large cities, as well as the main industrial regions stand out as severely polluted and are consequently clearly identifiable on air pollution maps.
Gases in Earth’s atmosphere (like nitrogen, oxygen and ozone) filter out harmful UV radiation
A filter that selects different optical wavelengths in an incoming light beam by applying a radio-frequency signal.