在光学数据集中把流星雨从零星背景中分离出来的D准则的性能
Performance of D-criteria in isolating meteor showers from the sporadic background in an optical data set
摘要：
将流星雨从零星的流星背景中分离出来对于研究流星雨和零星的复合体都是至关重要的。流星与流星雨、母天体和其他流星的联系是通过轨道相似性的测量来完成的。这些测量通常采取所谓的D参数的形式，并且通常与一些截止值配对，在该截止值内，两个轨道被认为是相关的。合适的截止值取决于数据集的大小（Southworth & Hawkins 1963），观测到的大小范围内的零星贡献（Jopek 1995），或阵雨的倾角（Galligan 2001）。如果目标是最小化提取的簇射的零星污染，则截止值还应反映与局部零星背景相比的簇射强度。在本文中，我们提出了一种方法来确定，在每个淋浴的基础上，轨道相似性截止值，对应于一个选定的可接受的假阳性率。这种方法还有助于我们区分哪些簇射在一组数据中是重要的。我们将这些方法应用于光学流星观测从美国宇航局的全天空和安大略省南部流星网络。
英文摘要：
Separating meteor showers from the sporadic meteor background is critical for the study of both showers and the sporadic complex. The linkage of meteors to meteor showers, to parent bodies, and to other meteors is done using measures of orbital similarity. These measures often take the form of so-called D-parameters and are generally paired with some cutoff value within which two orbits are considered related. The appropriate cutoff value can depend on the size of the data-set (Southworth & Hawkins 1963), the sporadic contribution within the observed size range (Jopek 1995), or the inclination of the shower (Galligan 2001). If the goal is to minimize sporadic contamination of the extracted shower, the cutoff value should also reflect the strength of the shower compared to the local sporadic background. In this paper, we present a method for determining, on a per-shower basis, the orbital similarity cutoff value that corresponds to a chosen acceptable false-positive rate. This method also assists us in distinguishing which showers are significant within a set of data. We apply these methods to optical meteor observations from the NASA All-Sky and Southern Ontario Meteor Networks.
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