The Belgian wave, 1989–90: an F-16 radar lock and a confessed hoax

From November 1989, Belgium experienced a sustained wave of reports describing large, slow, silent triangular objects with lights at the corners. It ran for about eighteen months, produced thousands of accounts, and was investigated with a degree of official openness that has no real parallel.

What is documented

The Belgian Air Force cooperated with SOBEPS, a civilian research group, rather than dismissing or absorbing the investigation. Senior officers gave interviews and released data. That relationship is the genuinely unusual feature of the case.

On the night of 30–31 March 1990, following ground radar contacts and police reports, two F-16s were scrambled. The aircraft achieved radar locks on targets that, according to the released data, performed accelerations and descents outside the envelope of known aircraft. The pilots made no visual contact.

The photograph, and why it matters

The image most people associate with the wave — a dark triangle with three corner lights and a central glow, taken at Petit-Rechain — was admitted to be a fake in 2011 by the man who made it. He described the technique: a piece of polystyrene, painted, with lights, photographed.

That confession is not disputed. It should be stated plainly wherever the image appears, and it frequently is not.

The radar night, examined

The F-16 data has been reanalysed since, and the conventional reading is that the locks were on electronic interference or ground returns, with the extreme accelerations being artefacts of the radar attempting to track a false target rather than measurements of a real object’s motion.

This is a serious argument and it accounts for the absence of visual contact — the pilots saw nothing because there was nothing to see. The counter-argument is that ground radar and multiple witnesses reported something in the same window.

What was probably happening in the wave

A large share of the sightings are consistent with aircraft — including, some have argued, unfamiliar aircraft operating at low level — seen at night by people primed by heavy media coverage to interpret three lights as one large object. The triangle shape follows naturally from three lights in formation.

That accounts for most of it. It does not obviously account for the reports of size, silence and slowness that recur, and the honest summary is a mostly explained wave with a residue nobody has closed.