用SWAN仪器观测的彗星C/1999 S4 (LINEAR) 的水产量
J T Mäkinen1, J L Bertaux, M R Combi
1Finnish Meteorological Institute, Geophysics Research, Post Office Box 503, FIN-00101 Helsinki, Finland. teemu.makinen@fmi.fi
Science (New York, N.Y.)
|May 19, 2001
概括
彗星C/1999 S4 (LINEAR) 由于连续爆发而碎片化,释放了3.3×10^9公斤的水. 其活动是由碎片化驱动的,碎片大小的力量分布法.
科学领域:
- 彗星科学 彗星科学
- 太阳系探索 太阳系探索
- 天体物理学 天体物理学
背景情况:
- 彗星C/1999 S4 (LINEAR) 经历了完全的碎片化.
- 使用SOHO航天器上的SWAN Lyman-alpha摄像头进行了观测.
研究的目的:
- 为了确定彗星C/1999 S4 (LINEAR) 碎片化期间的水产量.
- 分析碎片化过程及其对彗星活动的影响.
主要方法:
- 在SOHO航天器上使用了SWAN Lyman-alpha全天空摄像头.
- 收集了2000年5月至8月彗星昏迷的数据.
- 使用功率定律建模碎片大小分布.
主要成果:
- 估计在碎片化之前,阳光照射的核表面面积的下限为1平方公里.
- 在3.3 x 10^9公斤释放的量化总水量.
- 每16天发现四次大爆发,最终在7月21日完全碎片化.
结论:
- 彗星活动主要是由连续的碎片事件所主导的.
- 一个功率定律分布N(R) ~R^(-2.7) 对于碎片大小复制观察到的消散.
- 碎片尺寸分布可能反映彗星的内部结构.
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