长时间流星不均匀体母体特征个例研究

流星体坠入地球大气烧蚀电离产生流星等离子体尾迹，在等离子体不稳定性过程作用下产生流星不均匀体.利用光学视频和无线电雷达在低纬三亚开展流星体烧蚀和流星不均匀体综合探测结果，发展了一种获取流星不均匀体母体（流星体）特征参数的方法，并对2015年12月双子座流星雨期间观测的一次长持续时间流星不均匀体事例进行了分析，得到了其母体速度、质量和轨道等特征，结果显示产生这次流星不均匀体的流星体速度和轨道等具有双子座流星特点.该方法可应用于流星不均匀体及其母体特征研究. 

Case Study of Meteoroid Producing Long-duration Meteor Trail Irregularity

Meteoroids enter the Earth's atmosphere, creating columns of ionization and leaving a meteor trail of dense plasma, and the meteor irregularities are often produced through plasma instability. Using the simultaneous observations of meteor and meteor trail irregularities obtained by optical video and VHF radar over low latitude Sanya, respectively, a method to derive the characteristics of meteoroid producing meteor trail irregularities is developed. A case of long duration meteor trail irregularities observed during the Geminid meteor shower in December 2015 is investigated. The velocity, mass and orbit parameters of meteoroid are estimated through the location information of the meteor trail irregularities detected by radar and the direction and gray information of meteor trajectory observed by optical video. The results show that the speed and orbital parameters of the meteoroid producing the long-duration case are similar to those of the parent meteoroid causing the Geminid meteor shower. The method is expected to help understanding the occurrence characteristics of meteor trail irregularities and their corresponding meteoroids.