The collision of charged particles directed by the Earth’s magnetic field cause a natural light called Aurora, displayed in the sky. Aurora Lights usually appeared at night and typically occurs in the ionosphere, a part of the upper atmosphere. And these lights only appear in deep inside the polar regions. Plus, this phenomenon appears infrequently and often invisible to eyes. These things were believed in religious also. For example, in Cree, they called this “Dance of Spirits”. In the middle age in Europe, they believe the lights were a sign from a God (see Wilfried Schröder, Das Phänomen des Polarlichts, Darmstadt 1984).
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