宝瓶座和猎户座流星雨的活动
Activity of the Eta-Aquariid and Orionid meteor showers
摘要：
我们提出了一个多仪器，多年代分析的埃塔宝瓶座和猎户座流星雨的活动的目的，约束模型的1 P/哈雷的流星体流。通过汇编1985年以前公布的目视和雷达观测数据以及国际流星组织（海事组织）目视流星数据库、海事组织视频流星网和加拿大流星轨道雷达报告的最近测量数据，对阵雨高峰活动和持续时间的年际变化进行了研究。这些技术探测流星体质量的范围从亚毫克到克。分析了1985年以来宝瓶座和猎户座流星雨活动的持续时间、形状、最大天顶小时速率（ZHR）值和年峰值的太阳经度。在有数据的情况下，对每个探测网络记录的年度活动概况进行了测量和比较。三种探测方法的观测结果在阵雨的形状、活动水平和年强度变化方面基本一致。这两个阵雨显示几个活动峰值的可变位置和强度随时间的推移。伊塔宝瓶座流星雨通常比猎户座流星雨强两到三倍，但这两个流星雨偶尔会爆发，峰值是平时活动水平的两到四倍。自2002年以来的CMOR观测似乎支持猎户座流星雨活动变化存在约12年的周期;然而，需要对流星雨进行额外和更长期的雷达和光学观测来确认这种周期性。
英文摘要：
We present a multi-instrumental, multidecadal analysis of the activity of the Eta-Aquariid and Orionid meteor showers for the purpose of constraining models of 1P/Halley's meteoroid streams. The interannual variability of the showers' peak activity and period of duration is investigated through the compilation of published visual and radar observations prior to 1985 and more recent measurements reported in the International Meteor Organization (IMO) Visual Meteor DataBase, by the IMO Video Meteor Network and by the Canadian Meteor Orbit Radar (CMOR). These techniques probe the range of meteoroid masses from submilligrams to grams. The Eta-Aquariids and Orionids activity duration, shape, maximum zenithal hourly rates (ZHR) values, and the solar longitude of annual peaks since 1985 are analyzed. When available, annual activity profiles recorded by each detection network were measured and are compared. Observations from the three detection methods show generally good agreement in the showers' shape, activity levels, and annual intensity variations. Both showers display several activity peaks of variable location and strength with time. The Eta-Aquariids are usually two to three times stronger than the Orionids, but the two showers display occasional outbursts with peaks two to four times their usual activity level. CMOR observations since 2002 seem to support the existence of an ~12 year cycle in Orionids activity variations; however, additional and longer term radar and optical observations of the shower are required to confirm such periodicity.
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