海尔-波普彗星离子尾的间断和波动  

THE DISCONNECTION AND RIPPLING OF THE ION TAIL OF COMET HALE-BOPP

作　　者：汪琦[1] 杨捷兴[1] 张春生[1] 吴月珍 王玟 

机构地区：[1]中国科学院紫金山天文台,南京210008

出　　处：《空间科学学报》1999年第3期284-288,共5页Chinese Journal of Space Science

基　　金：小行星基金会资助

摘　　要：给出海尔-波普彗星近日点附近大尺度观测的结果．指出：1997年2月16、17和18日海尔-波普彗星等离子尾部分有断尾事件发生．观测时刻的离子尾内物质运动速度约为50km／s；离子尾射线向主尾主轴的并拢速度约为0．080'／s．1997年3月3日海尔-波普彗星离子尾有波动现象发生．波动发生在距离彗星密度中心约130×104km，偏离主轴30°处，振幅约20×104km、其离子束宽度约8×104km、波动的相速度约为200km／s．The observations of the large scale structure of Comet Hale-Bopp made around perihelion at Purple Mountain Observatory lead to the following results: 1) Some disconnection events occurred on Feb. 16, 17 and 18 in 1997. From these images it is concluded that the moving velocity of matter within the ion tail is about 50 km/s and the closing speed of a ray toward the main tail axis is 0.080'/s during the corresponding period of observations. 2) There is a rippling appeared in a beam of ion tail on March 3, 1997. Its phase velocity is about 200 km/s and its amplitude is about 0.2 million km. The width of this ion beam is 0.08 million km. The relevant data are obtained by means of PDS measurement.

关 键 词：彗星 离子尾 断尾 波动 海尔-波普彗星 

分 类 号：P185.81[天文地球—天文学]