What atmospheric phenomenon has been reported by amateurs and then by NASA in 2015?
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What atmospheric phenomenon has been reported by amateurs and then by NASA in 2015?
Answer
Steve, Strong Thermal Emission Velocity Enhancement by retroacronymy, is a luminous phenomenon reported from 2015 onwards. It takes the form of a thin bright purple ribbon associated with green, adopting an east-west alignment. Its appearance is thus reminiscent of a polar aurora, although it is observed below the auroral zone.