庞斯-布鲁克斯彗星不断变化的离子尾巴
(原标题: The Changing Ion Tail of Comet Pons-Brooks)
2024-04-08
浏览次数: 9
彗星尾巴是如何变化的？这取决于彗星。从3月6日到14日（从上到下）的9天内，彗星12P/ Pons-Brooks的离子尾巴发生了明显的变化。在某些日子里，彗星的离子尾巴相对较长且复杂，但不是每天都如此。彗尾变化的原因包括彗核物质抛射的速度、经过的太阳风的强度和复杂程度，以及彗星的自转速度。在一周的时间里，明显的变化甚至包括从地球上看的角度的变化。一般来说，彗星的离子尾巴会指向远离太阳的地方，因为太阳的风会把彗星上的气体推出去。今天，对于那些能够看到太阳完全被月亮遮住的人来说，庞斯-布鲁克斯可能会成为一颗罕见的彗星，在正午突然可见。美国宇航局报道：今天的日全食全日食图像：值得注意的提交给APOD
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How does a comet tail change? It depends on the comet. The ion tail of Comet 12P/Pons–Brooks has been changing markedly, as detailed in the featured image sequenced over nine days from March 6 to 14 (top to bottom). On some days, the comet's ion tail was relatively long and complex, but not every day. Reasons for tail changes include the rate of ejection of material from the comet's nucleus, the strength and complexity of the passing solar wind, and the rotation rate of the comet. Over the course of a week, apparent changes even include a change of perspective from the Earth. In general, a comet's ion tail will point away from the Sun, as gas expelled is pushed out by the Sun's wind. Today, Pons-Brooks may become a rare comet suddenly visible in the middle of the day for those able to see the Sun totally eclipsed by the Moon. NASA Coverage: Today's Total Solar Eclipse Total Eclipse Imagery: Notable Submissions to APOD
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