2020年双子座流星雨期间地基高功率雷达微流星体通量观测研究  

A Study on the Flux of Micrometeoroids Observed by Ground-based High-Power Radar during the 2020 Geminid Meteor Shower

作　　者：曾令旗 郭垚 赵必强[1,2,3,4] 丁锋[1,2,3,4] 李鸣远 ZENG Lingqi;GUO Yao;ZHAO Biqiang;DING Feng;LI Mingyuan(Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Beijing National Observatory of Space Environment,Beijing 100029,China)

机构地区：[1]中国科学院地质与地球物理研究所地球与行星物理学科中心,北京100029 [2]中国科学院地球科学创新研究院,北京100029 [3]中国科学院大学地球与行星科学学院,北京100049 [4]北京空间环境国家野外科学观测研究站,北京100029

出　　处：《空间科学与试验学报》2024年第4期55-63,共9页Journal of Space Science and Experiment

基　　金：国家自然科学基金项目(42174205);中国科学院A类先导专项项目(XDA17010206)。

摘　　要：基于三亚非相干散射雷达在2020年双子座流星雨期间的观测数据,研究了近地空间微流星体通量。2020年12月13至14日,在连续24 h观测时长里,共观测到9500次微流星事件,平均每小时约400次。根据雷达波束宽度及工作占空比等估算,近地空间微流星体通量为每日4.3次/百平米。由于受到雷达的观测模式和灵敏度限制,该估算值要低于实际微流星体通量值。微流星体通量周日分布差异较大,极大时刻出现在北京时间7:00,极小值时刻为19:00。美国“长期暴露设施”通过撞击坑获得的近地空间微流星体通量密度是三亚雷达获得的3倍。除了两种测量方式测量空间高度和测量时长等原因外,微流星体通量的地方时分布,可能是导致两者测量值差异的主要原因之一。本研究对建立我国自主的微流星体通量模型具有参考价值。Based on the observation data from the Sanya Incoherent Scatter Radar during the 2020 Geminid meteor shower,this study analyzed the flux of micrometeoroids in near-Earth space.From December 13th to 14th,2020,a total of 9,500 micrometeoroid events were detected over a continuous 24-hour observation period,with an average rate of approximately 400 events per hour.Considering the radar beam width and duty cycle,the flux of micrometeoroids in nearEarth space was estimated to be 4.3 events per day per 100 square meters.Given the radar's observational mode and sensitivity limitations,this estimated value is likely lower than the actual micrometeoroid flux.The diurnal distribution of micrometeoroid flux showed significant variation,with a peak occurring around 07:00 Beijing Time and a minimum around 19:00.The micrometeoroid flux density obtained by the Long Duration Exposure Facility(LDEF)in the United States through impact craters is three times higher than that obtained by the Sanya radar.In addition to differences in the spatial height and duration of measurements between the two methods,the local time distribution of micrometeoroid flux may also be one of the main reasons for the discrepancy between the two measured values.This study provides a reference for establishing an independent micrometeoroid flux model in China.

关 键 词：微流星体通量 高功率地基雷达 双子座流星雨 

分 类 号：P185[天文地球—天文学]