The story really starts with the sun. The Sun boils off a stream of electric particles into space. Some of these particles are trapped by the Earth's magnetic field, and then guided to the polar regions, where they collide with the atmosphere, and thats what generates the aurora.
The Earths magnetic field stores magnetic particles for hours, or even days, and suddenly, and we don't yet know what triggers it: these particles explode into the atmosphere. Which produces the brillant "Northern Lights".
For the early Europeans this strange luminance, fortold wars or the death of kings. Really it is a picture of the Earth's magnetic field. A hundred miles high, and a thousand miles wide. That is the science of it!
Just think of being in Norway and sitting under the stars, with the tree line all the way in every direction, but up in the nights sky, millions of stars that make the night completly black, and all of the sudden, out of no where, you look up! Boom! The Earth's magnetic field. The beautiful flow of the "Northern lights" One would be in awe. To witness our mother protecting herself, living, to see her fragility, her mercy, too feel her strength and divine power, this is something to be grateful for all ones life.
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