| ID | #1566300976 |
| Added | Tue, 20/08/2019 |
| Author | July N. |
| Sources | |
| Phenomena | |
| Status | Result
|
| Resume |
Initial data
March Odberg Gran looked out the kitchen window and found a strange round dark object with some smoke trailing behind it.
She took my camera and photographed the object from inside the house. Shortly thereafter, the object vanished or disappeared.
The investigation of UFO-Norge shed light on training exercises for firefighters that day. Five liters of diesel fuel burned by the explosion, the flames rose several meters up, and the smoke formed a dark ring at the height of 50-100 meters.
In clear weather, this kind of blowing smoke rings can be seen from great distances. The reason the photo shows a line, not a circle, is that the ring was visible on the edge.
Translated by «Yandex.Translator»
Original news
26 January 1999, 13:00 – Kraby, Lena, Østre Toten Marthe Oddbjørg Gran looked out of her kitchen window and discovered a strange round dark object with some smoke trailing after it. She got her camera and shot a photo of the object from inside the house. Shortly after that the object dissolved or disappeared. The investigation by UFO-Norge shed light on a firemen’s training exercise that day. Five liters of diesel fuel were burned explosively, the flames rising several meters up, and the smoke producing a dark ring at a height of 50-100 meters. In clear weather this kind of smoke rings can be seen from great distances. The reason the photo shows a line and not a circle, is that the ring was seen on edge.
Hypotheses
Investigation
Resume
Vortex ring
Toroidal vortex (also vortex ring) is a phenomenon in which the region of rotating fluid moving through the same or a different area of a fluid when the flow pattern takes the shape of a toroid (donut).
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