Green halo UFO over Alps

Summary

On June 10, 2015, a witness in the French Alps heard a deep noise and saw a circular object with a green fluorescent halo. The object emitted a sound similar to a lawnmower and moved in a straight line from west to east before disappearing into the clouds. The description initially suggested a paramotor, but local experts ruled this out due to weather conditions and regional regulations. Although the hypothesis can't be completely dismissed, the case was classified as "C" due to lack of reliable information and corroboration.