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Evaluating Single Spacecraft Observations of Planetary Magnetotails With Simple Monte Carlo Simulations: 2. Magnetic Flux Rope Signature Selection Effects

机译:通过简单的蒙特卡洛模拟评估单个航天器对行星磁极的观测:2.磁通量绳签名选择效果

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摘要

A Monte Carlo method of investigating the effects of placing selection criteria on the magnetic signature of in situ encounters with flux ropes is presented. The technique is applied to two recent flux rope surveys of MESSENGER data within the Hermean magnetotail. It is found that the different criteria placed upon the signatures will preferentially identify slightly different subsets of the underlying population. Quantifying the selection biases first allows the distributions of flux rope parameters to be corrected, allowing a more accurate estimation of the intrinsic distributions. This is shown with regard to the distribution of flux rope radii observed. When accounting for the selection criteria, the mean radius of Hermean magnetotail quasi‐force‐free flux ropes is found to be 589269+273 km. Second, it is possible to weight the known identifications in order to determine a rate of recurrence that accounts for the presence of the structures that will not be identified. In the case of the Hermean magnetotail, the average rate of quasi‐force‐free flux ropes is found to 0.12 min−1 when selection effects are accounted for (up from 0.05 min−1 previously inferred from observations).
机译:提出了一种蒙特卡洛方法,用于研究选择标准对通量绳原位encounter的磁性特征的影响。该技术已应用于Hermean磁尾中的MESSENGER数据的两次最新通量绳调查。已经发现,放置在签名上的不同标准将优先识别底层人口的稍有不同的子集。首先,对选择偏差进行量化可以校正通量钢丝绳参数的分布,从而可以更准确地估计固有分布。这与观察到的通量绳半径的分布有关。考虑选择标准时,发现Hermean磁尾准无力磁通绳的平均半径为 58 9 - < mn> 269 + 273 公里。其次,可以对已知的标识进行加权,以便确定导致无法标识的结构存在的重复率。就Hermean磁尾而言,考虑选择效应时,准无力通量绳的平均比率为0.12 min -1 (从0.05́min -1 < / sup>先前从观察中推断出的)。

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