A statistical study of meteoroid fragmentation and differential ablation using the Resolute Bay Incoherent Scatter Radar
A statistical study of meteoroid fragmentation and differential ablation using the Resolute Bay Incoherent Scatter Radar
复制标题
使用 Resolute Bay 非相干散射雷达对流星体破碎和差异烧蚀进行统计研究
DOI：
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
J. Mathews
中科院分区：
文献类型：
--
作者：
A. Malhotra;J. Mathews
[1]最近，流星物理学界对流星体质量通量到达高层大气的详细过程很感兴趣。特别令人感兴趣的是简单的烧蚀，差分烧蚀，和碎片的高功率大孔径（HPLA）雷达观测到的流星事件的解释的相对作用。有必要了解这些机制的相对作用，以确定到达高层大气的大量流星质量通量是否主要以纳米尘埃/烟雾的形式到达（通过碎裂）或原子形式（通过烧蚀），这反过来不仅对了解该地区的高层大气，而且对了解各种高层大气现象的形成和演变，如极地中层夏季回波，都有重要的影响。使用流星观测新业务的坚决湾非相干散射雷达（RISR），我们提出了第一个统计研究显示这些机制的相对贡献。我们发现RISR头部回波表现出约48%的碎裂，约32%的简单消融和约20%的差异消融。我们还报告存在的复合流星事件表现出一个以上的质量损失机制的签名。这些结果强调，流星体物质沉积到高层大气的过程是复杂的，涉及到这里所述的所有三种机制。这一结论与以前报道的结果不同，以前报道的结果强调了这些机制中的一个或另一个的重要性。这些结果还将有助于改进目前的流星体解体/烧蚀模型。
[1] There has been much interest in the meteor physics community recently regarding the detailed processes by which the meteoroid mass flux arrives in the upper atmosphere. Of particular interest are the relative roles of simple ablation, differential ablation, and fragmentation in interpretation of the meteor events observed by the high-power large-aperture (HPLA) radars. An understanding of the relative roles of these mechanisms is necessary to determine whether the considerable meteor mass flux arriving in the upper atmosphere arrives mostly in nanometer dust/smoke (via fragmentation) or atomic form (via ablation), which in turn has important consequences in understanding not only the aeronomy of the region but also the formation and evolution of various upper atmospheric phenomenon such as Polar Mesospheric Summer Echoes. Using meteor observations from the newly operational Resolute Bay Incoherent Scatter Radar (RISR), we present the first statistical study showing the relative contribution of these mechanisms. We find that RISR head echoes exhibited ∼48% fragmentation, ∼32% simple ablation, and ∼20% differential ablation. We also report existence of compound meteor events exhibiting signatures of more than one mass loss mechanism. These results emphasize that the processes by which the meteoroid mass is deposited into the upper atmosphere are complex and involve all three mechanisms described here. This conclusion is unlike the previously reported results that stress the importance of one or the other of these mechanisms. These results will also contribute in improving current meteoroid disintegration/ablation models.
影响因子：
5.2
作者：
D. Janches;L. Dyrud;S. Broadley;J. Plane
通讯作者：
D. Janches;L. Dyrud;S. Broadley;J. Plane
流星烧蚀的化学模型
影响因子：
6.3
作者：
Vondrak T
通讯作者：
Vondrak T