mystery of hessdelan lights

The secret in the hegedelan valley of *** Norway from 1930

Intact it is. So far nothing is known about the light. The light is visible just above the ground. Earlier this kind of light beam was observed in 1930. Sometimes, they appear in flat patterns up to the sky, sometimes in different colors. This kind of light appears 10 to 20 times every year. Scientists have plenty of theory about it, but nothing is satisfactory.