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来自旅行者2号与土星相遇的极端紫外线观测
概括
土星 土星 土星 土星
科学领域:
- 行星科学 行星科学
- 大气物理学 大气物理学
- 环环系统 环环系统
背景情况:
- 了解土星的大气动力学和组成对于比较行星学至关重要.
- 之前的研究提供了有限的关于大气上层混合和外层温度的数据.
研究的目的:
- 为了研究土星上层大气层的垂直混合.
- 为了确定外层和同质期温度.
- 分析极光辐射和环状物质.
主要方法:
- 对气发光和恒星隐形的综合分析.
- 恒星遮蔽数据来推导大气中的H(2) 波段吸收.
- 对土星环的光学深度测量.
- 对极光辐射和形态学的分析.
主要成果:
- 土星上层大气层的垂直混合参数 (K) 约为8×107cm2/s,比木星高出一个数量级.
- 外层温度是~400K;同期期温度是~200K.
- 在C环中发现了一种新的异常环形.
- 环的紫外线反射率是均的 (3.5-5%).
- 极光辐射与电子对H的冲击是一致的.
结论:
- 土星的上层大气表现出强烈的垂直混合.
- 中度H(2) 带排放的能量来源需要进一步调查.
- 极光形态表明与土星千米辐射有联系.
- 碰撞可能会影响泰坦的体中的分布.
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