利用声学记录比较火球发光效率模型

IF 2.5 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Icarus Pub Date : 2024-08-06 DOI:10.1016/j.icarus.2024.116250
Luke McFadden, Peter G. Brown, Denis Vida
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引用次数: 0

摘要

火球的总能量通常是通过光学测量和假定的发光效率值获得的。声学能量测量提供了一种独立的能量估算方法。在这里,我们结合光学和声学方法来验证 Borovičkaet 等人(2020 年)的发光效率模型。我们的目标是将这些模型与流星体能量沉积的声学测量结果进行比较。我们按照 Mcfaddenet 等人(2021 年)的方法,利用理论爆炸缩放定律,确定了四种不同明亮火球的火球碎裂事件和圆柱形冲击的爆炸当量。我们使用 MetSim 软件(Vidaet al.,2023 年)为火球建模,发现 Borovičkaet al.(2020 年)模型与我们的三个软玉体火球案例研究的一致性优于 2 倍。铁陨石火球是一个主要的例外,它的发光效率比用石质火球校准的模型预测值高出一个数量级。我们认为,光学能量和声学能量之间的巨大差异可能是铁质火球的一个特征,因此可以作为铁质火球的一个判别指标。
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A comparison of fireball luminous efficiency models using acoustic records

The total energy of a fireball is commonly obtained from optical measurements with an assumed value for luminous efficiency. Acoustic energy measurements offer an independent means of energy estimation. Here we combine optical and acoustic methods to validate the luminous efficiency model of Borovičkaet al. (2020). Our goal is to compare these models with acoustic measurements of meteoroid energy deposition. Employing theoretical blast scaling laws following the approach of Mcfaddenet al. (2021), we determine explosive yields for both fireball fragmentation events and cylindrical shocks for four different bright fireballs. We model fireballs using the MetSim software (Vidaet al., 2023) and find that the Borovičkaet al. (2020) model produces agreement better than a factor of two for our three chondritic fireball case studies. The major exception is an iron meteorite-producing fireball where the luminous efficiency is an order of magnitude higher than model predictions calibrated with stony fireballs. We suggest that large disparities between optical and acoustic energies could be a signature of iron fireballs and hence useful as a discriminant of that population.

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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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