Hessdalen lights, Norway

From 1981, people in the Hessdalen valley reported white, yellow, and red lights that hovered, darted, and sometimes passed behind terrain. A wave in 1981–85 brought Project Hessdalen: magnetometers, radar, and cameras on the ridge. Lights continue, less often, into the present. Spectra have sometimes shown a thermal continuum, sometimes not.

Ionization, combustion of valley gases, and dust have been modeled. No model owns every night. The wiki keeps a single index file for a long watch: a valley, a research station, and a phenomenon that did not end when the reporters left.