Dynamical Studies on Structures of Halley's Comet

哈雷彗星是在1985年秋至1986年春用50厘米施密特望远镜和91厘米望远镜在Dodaira天文台和188厘米望远镜在冈山天体物理观测站用位于牛顿焦点的CCD相机观测的。这些拍摄的照片已经被太阳风科学家结合空间和宇航科学研究所的Suisei和Sakigake的结果进行了分析和利用。在Dodaira天文台拍摄的照片中，清晰地展示了尾巴的演化。冈山188厘米望远镜的CCD相机拍摄的数据非常令人兴奋，因为其中一些数据揭示了离子尾巴是如何产生的，以及喷流是如何从原子核中喷出的。我们于11月12日、13日和12月11日至14日在冈山观测了哈雷彗星。在11月，我们可以看到彗星的离子尾巴。尽管当时几位天文学家宣布他们可以观测到喷流，但我们认为它们不是喷流，而是离子尾巴，因为密度计结果显示图像是圆形的。然而，我们在12月12日观测到的是一股喷流，因为光的中心严重偏离了图形的中心。通过从国外许多观察者那里收集的这些数据，我们可以研究喷流如何与彗星运动的不规则性相关联。

Halley's comet was observed during autumn, 1985 to spring, 1986 by 50cm Schmidt telescope and 91cm telescope at Dodaira Observatory and 188cm telescope at Okayama Astrophysical Observatory with CCD camera at Newton focus. The pictures taken have been already analyzed and utilized by scientists of solar winds in conjunction with results by Suisei and Sakigake of the Institute of Space and Astronautical Sciences.In the photographs taken at the Dodaira Observatory evolutions of tails are clearly exhibited. Data taken with CCD camera with 188cm telescope at Okayama are very exciting, since some of them shos how ion tails were created and how jet streams came out from the nucleus. We observed Halley's comet at Okayama on November 12 and 13 and December 11-14. In November we could see ion tails of the comet. Although it was announced by several astronomers then that they could observe jet streams, we believe that they are not jets but ion tails, since the densitometer results show that the images are circular. However, what we observed on December 12 is a jet since the center of light deviates considerably from the center of the figure.By using these kinds of data which will be collected from many observers oversea we can study how jet streams were correlated with irregularity of the motion of the comet.