Abstract

The problem of anomalous meteors with diffuse view and increased size of their comas at the beginning of radiation is considered. Results from processing some meteors detected with high-sensitive observational TV systems of the Super-Isocon type during Leonid storm observations in 2002 are given. As opposed to similar cases described in literature previously, the given meteors had an increased in size diffuse structure of the meteor coma not at extra-high altitudes but below 128 km: 118.06 ± 0.07 km, 123.01 ± 0.02 km, and 124.45 ± 0.10 km. At the trajectory beginning, their absolute stellar magnitudes varied in the range of +6^m to +5^m, and they reached –0.5^m in maximum of brightness. The range of their masses was 0.03–0.06 g. The influence of the TV system’s working mode on the possible appearance of artifacts is considered. While the transparent, diffuse view of a limiting low-light meteor image can be a result of a low signal-to-noise ratio, the increase in spatial size of a meteor coma cannot be explained by technical artifacts. Separation of some extremely low-light meteor images in start frames onto a range of individual point-like objects placed inside a zone of 0.5–1.5 km can serve as an indirect argument for real fragmentation of an initial particle. A conclusion is drawn about the possible fragmentation of some meteoroids from the Leonid stream during a time period of 2–3 weeks before collision with the Earth with velocities of fragment separation on the order of millimeters a second.

中文翻译：

---

一些流星在其古典高度的轨迹开始时的扩散结构

摘要

考虑了在辐射开始时具有弥散视图和彗形变大的异常流星的问题。给出了处理在2002年狮子座暴风云观测期间使用超Isocon型高灵敏度观测电视系统检测到的一些流星的结果。与先前文献中描述的类似情况相反，给定的流星在不是在超高海拔而是在128 km以下时，流星昏迷的大小弥散结构增加了：118.06±0.07 km，123.01±0.02 km和124.45±0.10 km 。在轨迹开始时，它们的绝对恒星大小在+6 ^m至+5 ^m的范围内变化，并且达到–0.5 ^m在最大亮度下。其质量范围为0.03-0.06 g。考虑了电视系统的工作模式对伪像可能出现的影响。虽然有限的低光流星图像的透明，漫射视图可能是低信噪比的结果，但流星昏迷的空间大小增加无法用技术人工制品来解释。在起始帧中将一些极弱光的流星图像分离到放置在0.5-1.5 km区域内的一系列单个点状对象上，可以作为间接破碎初始粒子的间接参数。得出的结论是，在与地球碰撞之前的2-3周内，狮子座流中的一些流星体可能发生碎片化，碎片分离的速度约为每秒毫米。