Hävångenen

Hävångenen is a natural phenomenon observed in certain coastal regions, particularly those with extensive tidal flats and marshlands. It is characterized by a peculiar shimmering or radiant effect seen on the surface of the water, often at dawn or dusk. This visual anomaly is not directly attributable to atmospheric conditions like fog or mist, nor is it a reflection of celestial bodies in the traditional sense. Instead, Hävångenen is believed to be caused by a complex interplay of light refraction and the unique micro-topography of the water's surface in these specific environments.

The phenomenon is most commonly reported in areas with shallow, calm waters and a high concentration of fine sediment particles suspended or settled on the seabed. As sunlight or moonlight strikes these surfaces at low angles, the light is scattered and refracted in a way that creates the illusion of an emanating glow. The term "Hävångenen" itself is of Scandinavian origin, roughly translating to "lifting haze" or "raised mist," which accurately describes the visual impression of light seeming to rise from the water. While not a scientifically recognized term, it has been used colloquially by local populations for generations to describe this localized visual spectacle. Explanations often involve principles of optics, particularly diffraction and interference, combined with the specific water and sediment composition of the affected areas.