Hessdalen lights

Residents of the Hessdalen valley reported bright white, yellow or red lights that hover, drift or move fast, 15 to 20 times a week between December 1981 and mid-1984 and less often since. Project Hessdalen's 1984 field campaign and, from 1998, an automatic measurement station with cameras, radar and magnetometers have recorded the lights repeatedly, with results in peer-reviewed papers; some sightings proved to be stars, aircraft or headlights. There is no agreed mechanism: proposals include combustion of airborne dust and a dusty plasma, and the workbench dossier treats it as a persistent unidentified natural light, not evidence of craft.

An unexplained natural atmospheric or geophysical light (dust combustion or dusty plasma proposed)

• Wikipedia: Hessdalen lightsen.wikipedia.org