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Citizen scientist data helps unravel the mystery of low-latitude blue auroras

It was one of two photos of blue-dominated auroras analyzed in this study. Credit: Takuya Usami On May 11, 2024, colorful aurora borealis appeared over the islands of Honshu and Hokkaido in Japan, triggered by an intense geomagnetic storm. Auroras observed at low latitudes usually appear red due to the emission of oxygen atoms. However, on this day, a salmon-pink…