延时影片: 极光、稳定极光红弧与银河

延时影片: 极光、稳定极光红弧与银河

Timelapse: Aurora, SAR, and the Milky Way
Video Credit & Copyright: Jeff Dai (TWAN); Music (License): Suite bergamasque by Claude Debussy

Explanation: What’s happening in the sky this unusual night? Most striking in the featured 4.5-hour 360-degree panoramic video, perhaps, is the pink and purple aurora. That’s because this night, encompassing May 11, was famous for its auroral skies around the world. As the night progresses, auroral bands shimmer, the central band of our Milky Way Galaxy rises, and stars shift as the Earth rotates beneath them. Captured here simultaneously is a rare red band running above the aurora: a SAR arc, seen to change only slightly. The flashing below the horizon is caused by passing cars, while the moving spots in the sky are satellites and airplanes. The featured video was captured from Xinjiang, China with four separate cameras.

Tomorrow’s picture: protostellar outflows

延时影片: 极光、稳定极光红弧与银河
影片提供与版权: Jeff Dai 戴建峰 (TWAN); 配乐（许可）: Suite bergamasque by Claude Debussy

说明: 这个不寻常夜晚的天空发生了什么事？在这部全长4个半小时的360度全景影片里，最吸睛的或许是粉红和紫色的极光。而拍摄影片的5月11日那晚，也因出现了全球性可见的极光而闻名遐迩。在影像里，随着夜晚流转，带状极光在天空摇曳，银河系的中央盘面升起，恒星随着地球自转而迁移。影片同时也记录了出现在极光上方，变化极为缓慢的罕见带状稳定极光红弧（SAR）。地平线下方的亮闪，是来自路过的汽车，而天空中的移动光点则是卫星和飞机。这部影片是用4部相机摄于在中国的新疆。

明日的图片: protostellar outflows

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