土星北极附近的极光
(原标题: Aurora around Saturn's North Pole)
2024-12-08
浏览次数: 19
土星的极光和地球的一样吗？为了帮助回答这个问题，哈勃太空望远镜和卡西尼号宇宙飞船在2017年9月卡西尼号绕土星最后轨道运行期间同时监测了土星的北极。在此期间，土星的倾斜使其北极从地球上清晰可见。这张特色图像是由哈勃望远镜拍摄的紫外线极光图像和土星云层和土星环的光学图像合成的。就像在地球上一样，土星的北极光可以在极点周围形成全部或部分环。然而，与地球不同的是，土星的极光经常是螺旋形的，而且更有可能在午夜和黎明之前达到亮度峰值。与木星的极光相比，土星的极光似乎与土星的内部磁场与附近多变的太阳风之间的联系更为密切。2004年，当地球可以清楚地看到土星的南极时，也曾拍摄过类似的土星南极光。你的天空惊喜：APOD在你的生日上展示了什么照片？(1995后)
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Are Saturn's auroras like Earth's? To help answer this question, the Hubble Space Telescope and the Cassini spacecraft monitored Saturn's North Pole simultaneously during Cassini's final orbits around the gas giant in September 2017. During this time, Saturn's tilt caused its North Pole to be clearly visible from Earth. The featured image is a composite of ultraviolet images of auroras and optical images of Saturn's clouds and rings, all taken by Hubble. Like on Earth, Saturn's northern auroras can make total or partial rings around the pole. Unlike on Earth, however, Saturn's auroras are frequently spirals -- and more likely to peak in brightness just before midnight and dawn. In contrast to Jupiter's auroras, Saturn's auroras appear better related to connecting Saturn's internal magnetic field to the nearby, variable, solar wind. Saturn's southern auroras were similarly imaged back in 2004 when the planet's South Pole was clearly visible to Earth. Your Sky Surprise: What picture did APOD feature on your birthday? (post 1995)