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The ILAN-ES (Imaging of Lightning And Nocturnal Emissions from Space)experiment was conducted in April 2022 as part of the Axiom company AX-1private mission to the International Space Station, in the framework of Rakia,an Israeli set of experiments selected for flight by the Ramon Foundation andthe Israeli Space Agency. The mission objective was to record transientluminous events from the Cupola window in the ISS, based on preliminarythunderstorm forecasts uploaded to the crew 24-36 hours in advance. A Nikon D6camera with a 50 mm lens was used, in a video mode of 60 fps. During the 12-daymission, 82 different targets were identified for the ISS, of which 20 wereimaged by the astronauts, yielding a total harvest > 80 TLEs: sprites, Elvesand BLUEs (blue corona discharges). We report here on opportune nadirobservation of a thunderstorm that produced multiple blue events near theMyanmar-Thailand border on April 21st, 2022, at 21:30 UT. The storm producedmany visible blue discharges of varying sizes and durations, in sizes rangingfrom hundreds of meters to a few km2. The emissions were mostly in blue,however the brightest events had also a conspicuous red component. We usedmeteorological and ENTLN lightning data to establish the relationship betweenlightning type and the observable properties of the blue corona discharges.

Space-based optical imaging of blue corona discharges on cumulonimbus cloud tops