2022年3月2日

这张特色图片显示了太阳在2月中旬经历了一次大爆发,可以看到一个大的日珥。请参阅说明以获取更多详细信息。

Record Prominence Imaged by Solar Orbiter
Image Credit:
Solar Orbiter, EUI Team, ESA & NASA; h/t: Bum-Suk Yeom

Explanation: 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.

Tomorrow’s picture: spiral galaxy NGC 2841


太阳轨道飞行器拍摄的创纪录日珥
影像提供:
Solar Orbiter, EUI Team, ESA & NASA; h/t: Bum-Suk Yeom

说明: 太阳发生了什么事?上个月,它产生一个影像记录史上最庞大的日珥 ,而同时入镜的还有完整的日盘。上面这幅呈现此创纪录日珥的主题影像,是由绕行太阳的太阳轨道飞行器拍摄于紫外光波段。太阳表面上方的宁静日珥,是指受太阳磁场局束的悬浮团状炽热气体。上图的日珥极为庞大,其宽度和太阳的直径相当。日珥有时会突然发生爆发,并以日冕物质抛射(CME)的形式,把炽热气体喷入太阳系。当日冕物质抛射冲撞地球及其磁层时,有时会触发明亮的极光。这例日珥后来的确产生日冕物质抛射,但喷发在远离地球的方向。虽然日珥和太阳多变的磁场必然有关联,不过日珥到底如何形成和维持,其能量机制仍然是科学研究的课题。

明日的图片: spiral galaxy NGC 2841

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