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A reproducible method to determine the meteoroid mass index

机译:确定流星体质量指数的可重现方法

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Context. The determination of meteoroid mass indices is central to flux measurements and evolutionary studies of meteoroid populations. However, different authors use different approaches to fit observed data, making results difficult to reproduce and the resulting uncertainties difficult to justify. The real, physical, uncertainties are usually an order of magnitude higher than the reported values. Aims. We aim to develop a fully automated method that will measure meteoroid mass indices and associated uncertainty. We validate our method on large radar and optical datasets and compare results to obtain a best estimate of the true meteoroid mass index. Methods. Using MultiNest, a Bayesian inference tool that calculates the evidence and explores the parameter space, we search for the best fit of cumulative number vs. mass distributions in a four-dimensional space of variables ( a,b, X _(1), X _(2) ). We explore biases in meteor echo distributions using optical meteor data as a calibration dataset to establish the systematic offset in measured mass index values. Results. Our best estimate for the average de-biased mass index for the sporadic meteoroid complex, as measured by radar appropriate to the mass range 10~(-3) & m & 10~(-5) g, was s = ?2.10 ± 0.08 . Optical data in the 10~(-1) & m & 10~(-3) g range, with the shower meteors removed, produced s = ?2.08 ± 0.08 . We find the mass index used by Grün et al. (1985) is substantially larger than we measure in the 10~(-4) & m & 10~(-1) g range.
机译:上下文。流星质量指数的确定对于流星测量和流星体种群进化研究至关重要。但是,不同的作者使用不同的方法来拟合观察到的数据,使得结果难以重现,因此不确定性也难以证明。实际的物理不确定性通常比报告的值高一个数量级。目的我们旨在开发一种可测量流星体质量指数和相关不确定性的全自动方法。我们在大型雷达和光学数据集上验证了我们的方法,并比较了结果,以获得对真实流星体质量指数的最佳估计。方法。使用MultiNest(贝叶斯推断工具,可计算证据并探索参数空间),我们在变量(a,b,X _(1),X)的四维空间中搜索累积数与质量分布的最佳拟合_(2))。我们使用光学流星数据作为校准数据集探索流星回声分布中的偏差,以在测得的质量指数值中建立系统偏移。结果。我们最好地估计零星流星体复合体的平均去偏质量指数,这是通过雷达测得的,适合质量范围为10〜(-3)&。 m& 10〜(-5)g,s =π2.10±0.08。光学数据在10〜(-1) m& 10〜(-3)g范围,去掉花洒流星,得出s =?2.08±0.08。我们发现Grün等人使用的质量指数。 (1985年)大大大于我们在10〜(-4)& m < 10〜(-1)g范围

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