Red, green... and sometimes even blue #aurorae visible at mid-latitudes! A rare spectacle, evidence of an intense episode of #spaceweather.

Green and red auroras result from interactions between the #SolarWind and atmospheric #oxygen molecules. Much rarer, blue emissions are caused by the excitation of #nitrogen molecules. All of these phenomena reflect specific conditions in the atmosphere and the flux of incoming particles, which #SpaceWeather models must account for: https://www.irap.omp.eu/en/2026/03/a-blue-aurora-observed-in-our-part-of-the-world-a-rare-and-revealing-phenomenon/