南极光和国际空间站
(原标题: Aurora Australis and the International Space Station)
2024-09-13
浏览次数: 17
这张照片是8月11日国际空间站在地球南半球印度洋上空约430公里处拍摄的。这幅壮观的景色向南和向东望去，穿过红色和绿色的南极光的帷幕，朝着地球的地平线。极光是由高度稀薄的上层大气中激发态的氧原子发出的辐射引起的，这些氧原子仍然存在于轨道前哨的水平上。原子氧的绿色辐射在海拔100至250公里处占主导地位，而原子氧的红色辐射可以延伸到海拔500公里处。在这些南极光的光芒之外，这张近地轨道上的照片揭示了从南半球的角度看星空。猎户座腰带和猎户座星云中的恒星靠近地球中部偏左的边缘。天狼星，大犬座的阿尔法星，也是地球夜晚最亮的恒星，位于南轨道天空的右边缘上方。抬头看：国际观察月夜
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This snapshot from the International Space Station was taken on August 11 while orbiting about 430 kilometers above the Indian Ocean, Southern Hemisphere, planet Earth. The spectacular view looks south and east, down toward the planet's horizon and through red and green curtains of aurora australis. The auroral glow is caused by emission from excited oxygen atoms in the extremely rarefied upper atmosphere still present at the level of the orbiting outpost. Green emission from atomic oxygen dominates this scene at altitudes of 100 to 250 kilometers, while red emission from atomic oxygen can extend as high as 500 kilometers altitude. Beyond the glow of these southern lights, this view from low Earth orbit reveals the starry sky from a southern hemisphere perspective. Stars in Orion's belt and the Orion Nebula are near the Earth's limb just left of center. Sirius, alpha star of Canis Major and brightest star in planet Earth's night is above center along the right edge of the southern orbital skyscape. Looking Up: International Observe the Moon Night