Aurora Borealis – arise when the charged particles from the Sun (the so-called solar wind) hit the Earth’s magnetic field. Along its lines are directed to the poles, where they collide with molecules of air. There was a belief that between fairy tales you should put in the history that polar lights sometimes made sounds, even “whispered” – until the case was investigated by scientists from the University of Aalto in Finland. The truth is that when the nights are cold and silent, auroras create rustlings and cracks. Audible for hundreds of kilometers. The reason is the so-called inversion layer. It arises when it is colder near the surface of the planet than at higher levels of the atmosphere. It causes that negatively charged particles from the Sun are trapped in the cold zone. If their accumulation exceeds the critical point. By reacting with positive ions in the atmosphere and causing discharges, rustling and crackling.
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