December 3., 2025

Another type of transient luminous event has been identified within the observational material of the UHU experiment. The pixie, also known as a blue emission, or simply ‘blue’, is a short-lived variant of corona discharges. These flashes typically form at or near the top of an active thundercloud. Although their name originates from early long-distance... Details »

August 27., 2025

Hints on how to start photographing TLEs, compiled by Christophe Suarez, are now linked in the page that intends to help photographers recently become interersted in capturing these events. The document is available in English, Spanish, and French.
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August 22., 2025

New observation data are becoming available from the UHU experiment, recorded by the crew of Axiom Space’s Ax-4 mission aboard the International Space Station between June 27 and July 13. Our team continues conducting quality checks and reviewing of the video recordings, searching for TLE . During the mission, we provided 8–12 potential observation possibilities... Details »

August 1., 2025

The observation campaign related to the project ended on 31 July. The collection of observations is still ongoing, similarly to the evaluation of observations made from space, some of which we still do not have access to. Thank you for the images you have sent and shared so far! We are still waiting for the observations made in July! Although this campaign has... Details »

July 18., 2025

During preliminary quality checks of the videos recorded during Axiom Space’s Ax-4 mission in the framework of the UHU Earth Observation experiment, we identified two distant ELVES , captured by Ax-4 mission commander Peggy Whitson on July 4 while flying over the Philippines and Eastern Indonesia. These are the first lightning-related optical flashes... Details »