Hessdalen lights are unusual, free-floating light balls presenting different shapes and light colors, observed in the Hessdalen valley in rural central Norway. In this work, it is shown that these ghostly light balls are produced by an electrically active inversion layer above Hessdalen valley during geomagnetic storms. Puzzling geometric shapes and energy content observed in the HL phenomenon may be explained through a little-known solution of Maxwell’s equations to electric (and magnetic) field lines: they can form loops in a finite space, called “unusual electromagnetic disturbance”. “Natural battery”, aerosols and global atmospheric electric circuit may play a crucial role for the electrification of the temperature inversion layers.

Hessdalen 灯是一种不寻常的、自由漂浮的光球，呈现出不同的形状和光色，在挪威中部农村的 Hessdalen 山谷中观察到。在这项工作中，表明这些幽灵般的光球是由地磁风暴期间 Hessdalen 山谷上方的电活性反转层产生的。在 HL 现象中观察到的令人费解的几何形状和能量含量可以通过麦克斯韦方程对电场（和磁场）线的一个鲜为人知的解来解释：它们可以在有限空间中形成回路，称为“异常电磁干扰”。“天然电池”、气溶胶和全球大气电路可能对逆温层的带电起关键作用。