通过光学对应物测量的流星无线电余辉的高度依赖性
Altitudinal dependence of meteor radio afterglows measured via optical counterparts
摘要：
利用LWA1射电望远镜的全天空成像能力以及一系列全天空光学相机，我们现在已经观测到44个与无线电余辉对应的光学流星。结合这些观测结果，我们确定了所有44个余辉的地理位置。比较无线电探测的数量作为海拔高度的函数与预期的明亮流星的数量，我们发现一个强烈的高度依赖性，其特征在于低于$\sim$ 90公里的截止，低于该截止没有无线电发射发生，尽管许多观察到的光学流星穿透远低于这个高度。这一截止值表明，电子碰撞产生的波阻尼是射电余辉演化的重要因素，这与射电余辉是电子等离子体波发射的结果这一假设是一致的。
英文摘要：
Utilizing the all-sky imaging capabilities of the LWA1 radio telescope along with a host of all-sky optical cameras, we have now observed 44 optical meteor counterparts to radio afterglows. Combining these observations we have determined the geographic positions of all 44 afterglows. Comparing the number of radio detections as a function of altitude above sea level to the number of expected bright meteors we find a strong altitudinal dependence characterized by a cutoff below $\sim$ 90 km, below which no radio emission occurs, despite the fact that many of the observed optical meteors penetrated well below this altitude. This cutoff suggests that wave damping from electron collisions is an important factor for the evolution of radio afterglows, which agrees with the hypothesis that the emission is the result of electron plasma wave emission.
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