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天文学家首度确认海王星存在极光现象
#太空

天文学家首度确认海王星上存在极光现象,由 NASA 韦伯太空望远镜所发现,补上了太阳系四颗巨行星极光观测的最后一块拼图。这也是我们首次直接捕捉到这颗最远行星的极光辉光与光谱特征。海王星位于太阳系边缘,距离太阳约45亿公里,是一颗冰冷巨行星。自 1989 年航海家二号飞掠海王星后,这颗遥远行星便再无太空船造访。如今韦伯太空望远镜首度捕捉到海王星上明亮的极光活动。这项突破得益于韦伯望远镜优异的近红外灵敏度,不仅能拍下极光发出的辉光,还能透过光谱清楚辨识代表极光活动的重要指标:三氢阳离子(H₃⁺)。这种离子也曾在木星、土星与天王星的极光中被侦测到,被视为气体行星极光的重要证据。与地球或木星不同,海王星的极光并不集中于南北极,而是分布在行星的中纬度地区。这是因为海王星具有异常倾斜的磁场结构,其磁轴与自转轴倾斜达 47 度,这一特征最早由航海家二号所发现。
天文館:首度捕捉到海王星極光
NASA's Webb Captures Neptune's Auroras For First Time



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天文学家首度确认海王星存在极光现象
#太空

天文学家首度确认海王星上存在极光现象,由 NASA 韦伯太空望远镜所发现,补上了太阳系四颗巨行星极光观测的最后一块拼图。这也是我们首次直接捕捉到这颗最远行星的极光辉光与光谱特征。海王星位于太阳系边缘,距离太阳约45亿公里,是一颗冰冷巨行星。自 1989 年航海家二号飞掠海王星后,这颗遥远行星便再无太空船造访。如今韦伯太空望远镜首度捕捉到海王星上明亮的极光活动。这项突破得益于韦伯望远镜优异的近红外灵敏度,不仅能拍下极光发出的辉光,还能透过光谱清楚辨识代表极光活动的重要指标:三氢阳离子(H₃⁺)。这种离子也曾在木星、土星与天王星的极光中被侦测到,被视为气体行星极光的重要证据。与地球或木星不同,海王星的极光并不集中于南北极,而是分布在行星的中纬度地区。这是因为海王星具有异常倾斜的磁场结构,其磁轴与自转轴倾斜达 47 度,这一特征最早由航海家二号所发现。
天文館:首度捕捉到海王星極光
NASA's Webb Captures Neptune's Auroras For First Time

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