Ion Composition Results During the International Cometary Explorer Encounter with Giacobini-Zinner
Ion Composition Results During the International Cometary Explorer Encounter with Giacobini-Zinner
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国际彗星探测器与贾科比尼-津纳相遇期间的离子组成结果
DOI：
10.1126/science.232.4748.374
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发表时间：
1986
期刊：
影响因子：
56.9
通讯作者：
J. Geiss
中科院分区：
文献类型：
--
作者：
K. Ogilvie;M. Coplan;P. Bochsler;J. Geiss
1985年9月11日，国际彗星探索者号宇宙飞船穿过贾科比尼-辛纳彗星的彗发，距彗核反日方向约7800公里。离子组成仪器是敏感的环境离子的质量-电荷比的范围内1.4至3原子质量单位每电子电荷（amu e-1）和14至33 amu e-1。测量结果的初步解释表明存在H2O+、H3 O+，可能是CO+和HCO+，以及质量范围为23至24的离子;可能的候选离子是Na+和Mg+。除了这些重离子，在80至223公里每秒的速度范围内测量，该仪器还测量了237至463公里每秒范围内的太阳风起源的He 2+。重离子的速度分布表明它们是被运动的电场拾取的，而轻离子则随着彗星尾轴的接近而稳定地减速。这些结果与彗星主要由水冰和其他物质组成的图像一致，这些物质升华，从核中流出，电离，并与太阳风相互作用。K. W.奥格尔维，美国宇航局/戈达德太空飞行中心，代码692，绿地，MD 20771。
The International Cometary Explorer spacecraft passed through the coma of comet Giacobini-Zinner about 7800 kilometers antisunward of the nucleus on 11 September 1985. The ion composition instrument was sensitive to ambient ions with mass-to-charge ratios in the ranges 1.4 to 3 atomic mass units per electron charge (amu e-1) and 14 to 33 amu e-1. Initial interpretation of the measurements indicates the presence of H2O+, H3O+, probably CO+ and HCO+, and ions in the mass range 23 to 24; possible candidates are Na+ and Mg+. In addition to these heavy ions, measured over the velocity range 80 to 223 kilometers per second, the instrument measured He2+ of solar wind origin over the range 237 to 463 kilometers per second. The heavy ions have a velocity distribution which indicates that they have been picked up by the motional electric field, whereas the light ions are steadily decelerated as the comet tail axis is approached. These results are in agreement with the picture of a comet primarily consisting of water ice, together with other material, that sublimes, streams away from the nucleus, becomes ionized, and interacts with the solar wind. K. W. Ogilvie, NASA/Goddard Space Flight Center, Code 692, Greenbelt, MD 20771.