Abstract We present direct video observations of fragmentation in the first half of the atmospheric trajectory of several fireballs recorded with the Czech part of the European Fireball Network. The fragmentation takes place in the form of wakes. In this work we describe heights, velocities, and sizes of meteoroids, deduced from our Digital Autonomous Fireball Observatories, where these wakes form and disappear, and lengths of wakes from our video records. We compare derived fireball parameters with values derived on the basis of light curve modeling. The aim of the work is to determine the type of fragmentation and propose its possible source. The observed dynamic pressures at these fragmentation points are of the order of 0.01 ​MPa. Observed flow regimes indicate that the creation of wakes may be triggered by the meteor shock wave. Quasi-continuous fragmentation was determined as the responsible type of fragmentation in the first half of the atmospheric trajectory by our model.

中文翻译：

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大气轨迹前半段的火球碎裂

摘要 我们展示了欧洲火球网络捷克部分记录的几个火球大气轨迹前半部分碎片的直接视频观测。碎片以尾迹的形式发生。在这项工作中，我们描述了流星体的高度、速度和大小，这些流星体是从我们的数字自治火球天文台推导出来的，这些尾流在那里形成和消失，以及我们的视频记录中的尾流长度。我们将派生的火球参数与基于光曲线建模的值进行比较。这项工作的目的是确定碎片的类型并提出其可能的来源。在这些破碎点观察到的动态压力约为 0.01 MPa。观察到的流动状态表明，流星冲击波可能会触发尾流的产生。