Northern lights in Tromsø, displaying the collisions between electrically charged particles from the sun which penetrate the earth’s magnetic shield and strike atoms and molecules in our atmosphere. Collisions excite the atoms causing electrons to move to higher-energy orbits, further away from the nucleus. When electrons move back to lower-energy orbits, they release particles of light call ...[Read More]
Imaggeo on Mondays: Northern lights in northern Norway
Northern lights in northern Norway. Credit: Rita Nogherotto (distributed via imaggeo.egu.eu)