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Bringing the Visible Universe into Focus with Robo-AO
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在彗星Shoemaker-Levy 9撞击期间,HST对木星的远紫外线成像
J T Clarke1, R Prangé, G E Ballester
1Space Physics Research Laboratory, University of Michigan, Ann Arbor 48109.
Science (New York, N.Y.)
|March 3, 1995
概括
哈勃太空望远镜远紫外线图像显示,木星是木星.
科学领域:
- 行星科学 行星科学
- 天文学 天文学
- 天体物理学 天体物理学
背景情况:
- 1994年7月,Shoemaker-Levy 9彗星撞击木星,为研究木星大气提供了独特的机会.
- 之前对气体巨星撞击的影响的观测在光谱范围和时间分辨率上是有限的.
研究的目的:
- 用远紫外线 (FUV) 成像分析木星对Shoemaker-Levy 9撞击的大气反应.
- 将FUV观测与更长波长进行比较,以了解撞击产生的气溶的高度和特性.
- 为了调查与撞击相关的木星极光活动的潜在变化.
主要方法:
- 利用哈勃太空望远镜的FUV成像能力,在撞击期间和撞击后捕获木星的高分辨率图像.
- 分析了FUV频谱中撞击地点的时间演变.
- 与极光辐射和全球极光活动相关联的FUV观测.
主要成果:
- 撞击区域在FUV图像中显示在撞击后2-3小时内变暗,持续更长时间,并且比可见波长的特征更远.
- 这表明,与可见光吸收器相比,紫外线吸收气体或气溶的存在更广泛,更能吸收,并且在更高的高度吸收紫外线.
- 在K撞击地点的磁联附近检测到过渡性极光辐射;全球极光活动比平均水平微弱.
结论:
- 在FUV观测显示了受冲击影响的独特大气层,具有显著的高空气溶或气体沉积.
- 撞击影响了木星的磁层,导致局部的极光增强和全球极光亮度的普遍下降.
- 这项研究强调了FUV观测对于在外星撞击期间探测大气动力学和组成的实用性.
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