AnomalyOn April 12, 2017 at 2:00 p.m., a witness is intrigued by the slow movement of a very bright round shape in the clear sky. He films and takes a photo of the phenomenon. Only one testimony will be collected. As the witness mentions, his observation could well correspond to the passage of a radiosonde balloon. Indeed, after verification with the Météo-France center in Brest-Guipavas contacted on June 27, 2017, balloon releases take place twice a day at 11:00 a.m. UTC and 11:15 p.m. UTC. It is entirely probable that a radiosonde balloon released in Brest-Guipavas at 11:00 a.m. UTC ends up in Saint-Brieuc at 1:50 p.m. local time. Balloons can fly at an altitude of 20 km and are not subject to ground-level winds. GEIPAN classifies this case as B, likely the observation of a Météo-France radiosonde balloon released from Brest-Guipavas.
C�tes-d'Armor, France · 2017-04-12 · from the GEIPAN archive
An account in C�tes-d'Armor, France
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This is an official case file of GEIPAN, the French space agency's unidentified aerospace phenomena office, machine translated from French. The original text and the full investigation file are at geipan.fr. We reproduce it with thanks and remove anything on request.