空间站，日珥，太阳
(原标题: Space Station, Solar Prominences, Sun)
2023-11-19
浏览次数: 19
那不是太阳黑子。这是国际空间站（ISS）从太阳前面经过的照片。太阳黑子，单独地，有一个黑暗的中央本影，周围较浅的半影，没有龙胶囊附着。相比之下，国际空间站是一个复杂的多尖顶机构，是人类有史以来创造的最大、最复杂的航天器之一。此外，太阳黑子绕着太阳转，而国际空间站绕着地球转。对于每90分钟绕地球一周的国际空间站来说，凌日并不罕见，但要想拍到一张好照片，就很难找到合适的位置、时间和设备。这张特色图片结合了2021年在同一地点几乎同一时间拍摄的三张照片。其中一张照片——过度曝光——捕捉到了太阳顶部微弱的日珥，第二张照片——曝光不足——捕捉到了太阳色球层的复杂纹理，而第三张照片——最难拍到的——捕捉到了空间站在几分之一秒内穿越太阳的画面。仔细观察空间站的轮廓，甚至可以看到一个停靠在空间站上的“龙”号太空舱。在Instagram上关注APOD：阿拉伯语，英语，波斯语，葡萄牙语和台湾语
查看原文解释
That's no sunspot. It's the International Space Station (ISS) caught passing in front of the Sun. Sunspots, individually, have a dark central umbra, a lighter surrounding penumbra, and no Dragon capsules attached. By contrast, the ISS is a complex and multi-spired mechanism, one of the largest and most complicated spacecraft ever created by humanity. Also, sunspots circle the Sun, whereas the ISS orbits the Earth. Transiting the Sun is not very unusual for the ISS, which orbits the Earth about every 90 minutes, but getting one's location, timing and equipment just right for a great image is rare. The featured picture combined three images all taken in 2021 from the same location and at nearly the same time. One image -- overexposed -- captured the faint prominences seen across the top of the Sun, a second image -- underexposed -- captured the complex texture of the Sun's chromosphere, while the third image -- the hardest to get -- captured the space station as it shot across the Sun in a fraction of a second. Close inspection of the space station's silhouette even reveals a docked Dragon Crew capsule. Follow APOD on Instagram in: Arabic, English, Persian, Portuguese, and Taiwanese
© Mehmet Ergün