"aurorae" - 1 õppematerjal

NORTHERN LIGHTS

oxygen. Red colouring is also due to oxygen with a contribution from nitrogen. The violet we often see is due to nitrogen, as is most blue colouring. The charged particles originate from the sun, and it is the 'weather' conditions on the sun that decide whether or not we will see the aurora. Particles can stream out from the sun and some are captured by the Earth's magnetic field and find their way into the polar regions. How high up are the Northern Lights? Most aurorae occur between 90 and 130 km above sea level, but some, particularly the ray-like forms, extend to several hundred kilometers up. In comparison, the usual altitude for a jet aircraft is around 10km and the ozone layer lies between 20 and 30km so we have to be almost up at the heights of satellites orbits to be at the same height as the aurora Best Northern Lights pic ever?  List of used literature: http://geo.phys.uit.no/articl/nord_eng.html https://en.wikipedia