论文标题
全球流星网络数据中的流星淋浴辐射分散体
Meteor shower radiant dispersions in Global Meteor Network data
论文作者
论文摘要
当源自公共来源的流星流与地球相交时，流星阵雨会发生。在溪流中不同的流星体的运动方向之间会有很小的差异，这些小差异将起作用，以扩大淋浴的辐射或明显的起源点。当考虑地球重力对溪流的影响时，流星辐射中的这种分散尤其重要，因为它限制了由于引力聚焦而导致的溪流通量的增强程度。在本文中，我们使用全球流星网络的观测值介绍了十二个阵雨的辐射分散体。我们发现，淋浴辐射的单个流星的中位数范围从0.32 $^\ circ $的Eta Aquariids到南方牛头龙的1.41 $^\ Circ $。我们还发现，对于大多数阵雨，随着时间的流逝，以日光为中心的黄道辐射和/或地理为中心的速度有一个小但统计学上的漂移。最后，我们将辐射分散液与淋浴时间进行比较，发现与先前的结果相比，我们的数据中没有相关的两个量。
Meteor showers occur when streams of meteoroids originating from a common source intersect the Earth. There will be small dissimilarities between the direction of motion of different meteoroids within a stream, and these small differences will act to broaden the radiant, or apparent point of origin, of the shower. This dispersion in meteor radiant can be particularly important when considering the effect of the Earth's gravity on the stream, as it limits the degree of enhancement of the stream's flux due to gravitational focusing. In this paper, we present measurements of the radiant dispersion of twelve showers using observations from the Global Meteor Network. We find that the median offset of individual meteors from the shower radiant ranges from 0.32$^\circ$ for the eta Aquariids to 1.41$^\circ$ for the Southern Taurids. We also find that there is a small but statistically significant drift in Sun-centered ecliptic radiant and/or geocentric speed over time for most showers. Finally, we compare radiant dispersion with shower duration and find that, in contrast with previous results, the two quantities are not correlated in our data.
