High-altitude meteors and meteoroid fragmentation observed at the Jicamarca Radio Observatory
High-altitude meteors and meteoroid fragmentation observed at the Jicamarca Radio Observatory
复制标题
吉卡马卡射电天文台观测到的高空流星和流星体碎片
DOI：
10.1093/mnras/stu2176
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发表时间：
2015
影响因子：
4.8
通讯作者：
J. Mathews
中科院分区：
文献类型：
--
作者：
B. Gao;J. Mathews
现代高功率大孔径雷达已用于各种调查，包括流星体碎裂调查。碎片化的确定是基于对头部和尾部回波特性的无线电科学详细解释。我们现在扩大对碎裂流星体的讨论，以包括在希卡马卡射电天文台观测到的高空（130-180公里）明显流星。虽然有一些关于光学和雷达观测高空流星的报告，但流星雷达界仍然持怀疑态度，怀疑天线旁瓣污染是最常见的反对意见。我们报告的结果，从两组流星观测在JRO在2010年4月。我们的研究结果包括流星体碎裂的结果，类似于那些从阿雷西博甚高频雷达。这些发现导致的结论，碎片不仅在JRO观察到，但k-B散射增加了一个有趣的额外的无线电科学层面的问题。我们还报告了明显的高空流星事件，如果最终得到证实，提供洞察溅射作为流星电离的来源，也许表明磁场几何形状在这些头部回波观测的独特重要性。此外，还发现了新的、显然是高空的瞬变事件，可能与流星体通量有关。在介绍这些结果时，我们注意到我们对JRO雷达的仔细校准，利用卫星返回信号，以便在很大程度上（如果不是完全）排除旁瓣污染和其他可能的误差源，正如我们的配套文件中所报告的那样。
Modern high-power, large-aperture (HPLA) radars have been used in a variety of investigations including the investigation of meteoroid fragmentation. The identification of fragmentation has been based on a detailed interpretation, based on radio science, of head- and trail-echo properties. We now extend the discussion of fragmenting meteoroids to include apparent high-altitude (130–180 km) meteors observed at the Jicamarca Radio Observatory (JRO). While there have been a few reports of high-altitude meteors observed both optically and with radar, the meteor radar community has remained sceptical, with suspicions of antenna side-lobe contamination being the most commonly raised objection. We report results from two sets of meteor observations carried out at JRO in 2010 April. Our findings include meteoroid fragmentation results that are similar to those from the Arecibo VHF radar. These findings lead to the conclusions that fragmentation is not only observed at the JRO but thatk⊥Bscattering adds an interesting additional radio science dimension to the issue. We also report on apparent high-altitude meteor events that, if ultimately confirmed, offer insight into sputtering as a source of the meteor ionization, and perhaps indicate the unique importance of magnetic field geometry in these head-echo observations. Also, new, apparently high-altitude transient events, likely related to the meteoroid flux, have been identified. In presenting these results, we note our careful calibration of the JRO radar, utilizing satellite returns in order to largely, if not totally, exclude side-lobe contamination and other possible error sources, as reported in our companion paper.
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