2022年10月30日在斯堪的纳维亚上空观测到的巨大流星群的性质、年龄和起源
Properties, age, and origin of a huge meteor cluster observed over Scandinavia on 30 October 2022
AI总结：
本研究利用多台相机观测数据，计算了2022年10月30日斯堪的纳维亚上空流星群的大气轨迹和光度质量，发现流星群形成于撞击地球前约10.6天，热应力导致的母体碎裂是其最可能成因。
摘要：
2022年10月30日发生在波罗的海和南斯堪的纳维亚上空的流星爆发（包含至少22颗流星）被多台相机记录下来。一颗明亮的火球在10秒内被较暗的流星跟随。所有流星都沿着平行轨迹运行。本研究的目的是确定流星的大气轨迹和光度质量，并利用这些数据确定母体流星体破裂和流星群形成的具体情况。使用视频相机进行双站和三站观测，用于计算流星的大气轨迹和光度质量。随后利用它们的相对位置和质量分布来确定流星体碎裂的时间和原因。假设流星体体积密度为1000 kg.m$^{-3}$，流星群粒子在大气中的相对位置及其质量分布最符合较小碎片在撞击地球前10.6$\pm$1.7天从质量占主导的碎片上分离的情况。喷射速度在0.16-0.61 m.s$^{-1}$范围内。喷射速度的方向受限于一个顶角为$43^\circ$的锥体。该锥体的轴的黄道坐标为$l=154^\circ$和$b=26^\circ$，且与太阳方向相距$66^\circ$。热应力似乎是导致这种流星群形成的最可能原因。
英文摘要：
A meteor outburst consisting of at least 22 meteors above the Baltic sea and southern Scandinavia that occurred on 30 October 2022 was recorded using multiple cameras. A bright fireball was followed by fainter meteors over a 10 second period. All the meteors were travelling on parallel trajectories. The goal of this study is to determine the atmospheric trajectories and photometric masses of meteors and to use these data to determine the specifics of the progenitor meteoroid break-up and cluster formation. Double and triple-station observations using video cameras were used for the calculation of the atmospheric trajectories and photometric masses of the meteors. Their relative positions and mass distribution were then used to determine the time and cause of the meteoroid fragmentation. The relative position of the cluster particles in the atmosphere and the distribution of their masses best correspond to the separation of the smaller fragments from the mass-dominant fragment 10.6$\pm$1.7 days before the collision with Earth, assuming a meteoroid bulk density of 1000 kg.m$^{-3}$. The ejection velocities are in the range 0.16-0.61 m.s$^{-1}$. The directions of the ejection velocities are bounded by a cone with an apex angle of $43^\circ$. The axis of this cone has ecliptic coordinates of $l=154^\circ$ and $b=26^\circ$ and is $66^\circ$ away from the direction to the Sun. Thermal stresses appear to be the most likely cause of such meteor cluster formation.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
