由太阳轨道器拍摄的记录日珥图像
(原标题: Record Prominence Imaged by Solar Orbiter)
2022-03-02
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我们的太阳发生了什么？上个月，它产生了有史以来最大的日珥和一个完整的太阳盘。这张记录图像是由绕太阳运行的太阳轨道飞行器在紫外线下拍摄的。静止日珥是太阳磁场作用下太阳表面的热气体云。这个日珥非常巨大，其长度与太阳本身的直径相当。太阳日珥可能会不可预测地爆发，并通过日冕物质抛射（CME）将热气体排出太阳系。当日冕物质抛射撞击地球及其磁层时，可能会出现明亮的极光。这次日珥确实产生了日冕物质抛射，但它的方向远离地球。虽然这肯定与太阳不断变化的磁场有关，但产生和维持日珥的能量机制仍然是一个研究课题。
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What's happened to our Sun? Last month, it produced the largest prominence ever imaged together with a complete solar disk. The record image, featured, was captured in ultraviolet light by the Sun-orbiting Solar Orbiter spacecraft. A quiescent solar prominence is a cloud of hot gas held above the Sun's surface by the Sun's magnetic field. This solar prominence was huge -- spanning a length rivaling the diameter of the Sun itself. Solar prominences may erupt unpredictably and expel hot gas into the Solar System via a Coronal Mass Ejection (CME). When a CME strikes the Earth and its magnetosphere, bright auroras may occur. This prominence did produce a CME, but it was directed well away from the Earth. Although surely related to the Sun's changing magnetic field, the energy mechanism that creates and sustains a solar prominence remains a topic of research.