The Big Corona
Image Credit & Copyright: P. Horálek,Z. Hoder, M. Druckmüller, P. Aniol, S. Habbal / Solar Wind Sherpas
Explanation: Most photographs don\'tadequately portray the magnificence of the Sun\'s corona. Seeing the coronafirst-hand during a total solar eclipse is unparalleled. The human eye canadapt to see coronal features and extent that average cameras usually cannot.Welcome, however, to the digital age. The featured central image digitallycombined short and long exposures that were processed to highlight faint andextended features in the corona of the total solar eclipse that occurred inAugust of 2017. Clearly visible are intricate layers and glowing caustics of anever changing mixture of hot gas and magnetic fields in the Sun\'s corona.Looping prominences appear bright pink just past the Sun\'s limb. Faint detailson the night side of the New Moon can even be made out, illuminated by sunlightreflected from the dayside of the Full Earth. Images taken seconds before andafter the total eclipse show glimpses of the background Sun known as Baily\'sBeads and Diamond Ring. Tomorrow, a new total solar eclipse will be visiblefrom parts of South America.
广袤的日冕
几乎没有照片能够充分描绘出太阳日冕的壮丽。在日全食期间亲眼看到的日冕是无与伦比的。人眼能够适应普通照相机无法看到的日冕特征和规模。无论如何，欢迎来到数字时代。这幅绚丽的中央影像数码合成了短曝光和长曝光照片，经过数字处理，突出了2017年8月日全食期间日冕的黯淡和外延特征。清晰可见的是太阳日冕中不断变化的炽热气体和磁场混合物之复杂层状结构和炽热焦散线。环状日珥在太阳边缘呈现出亮粉色。由于受到整个地球白昼期间所反射阳光的照耀，新月夜面的黯淡结构也清晰可见。在全食阶段前后几秒钟拍摄到了名为贝利珠或钻石环背景的太阳惊鸿一瞥。明日，在南美洲大部分地区将会看到一次新的日全食。
参考文献：
https://apod.nasa.gov/apod/image/1907/TSE2017_Horalek_1600.jpg
近期文章：
Astronomy Picture of the Day——时长越来越长的白昼
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