Ogilvie K W, Coplan M A, Bochsler P, Geiss J
Science. 1986 Apr 18;232(4748):374-7. doi: 10.1126/science.232.4748.374.
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 H(2)O(+), H(3)O(+), 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 He(2+) 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.
1985年9月11日，国际彗星探测器飞船穿过贾科比尼-津纳彗星的彗发，位置在彗核背向太阳约7800公里处。离子成分仪器对质量电荷比在1.4至3原子质量单位每电子电荷（原子质量单位/电子电荷，即amu e⁻¹）以及14至33 amu e⁻¹范围内的环境离子敏感。对测量结果的初步解读表明存在H₂O⁺、H₃O⁺，可能还有CO⁺和HCO⁺，以及质量范围在23至24的离子；可能的候选离子是Na⁺和Mg⁺。除了这些在80至223公里每秒速度范围内测量到的重离子外，该仪器还在237至463公里每秒的范围内测量到了太阳风起源的He²⁺。重离子的速度分布表明它们是被运动电场俘获的，而轻离子在接近彗尾轴时会持续减速。这些结果与彗星主要由水冰以及其他物质组成的图景相符，这些物质升华后从彗核流出，被电离，并与太阳风相互作用。K. W. 奥格尔维，美国国家航空航天局/戈达德太空飞行中心，代码692，马里兰州格林贝尔特，邮编20771。
