论文标题
低速流星的协调光学和雷达测量
Coordinated Optical and Radar Measurements of Low Velocity Meteors
论文作者
论文摘要
为了更好地估计哪种发光效率（$τ$）值与电离系数（$β$）的当代值兼容，我们报告了一系列同时的光学和镜面回声雷达测量值。总共确定了1249个同时发生的EMCCD和雷达流星。详细分析了36个事件的子集，其中29个速度小于20 km/s。这些流星在+4至+7.7之间的镜面雷达点上具有G波段幅度，平均辐射功率为5W（假设零幅度的流星的功率为945 W），质量为1-10 mg。这些对应于+6的典型大小。我们发现$β$ / $τ$与辐射功率密切相关。我们所有同时的流星都有类似小行星的轨道，六个可能是可能的铁子体，占我们慢速速度样本的20％。发光效率值在低速下平均为0.6％，范围从少于0.1％到几乎30％。尽管可能存在较高的发光效率和辐射功率之间的相关性较弱，但速度与速度的发光效率没有明显趋势。
To better estimate which luminous efficiency ($τ$) value is compatible with contemporary values of the ionization coefficient ($β$), we report a series of simultaneous optical and specular echo radar measurements of low speed meteors. A total of 1249 simultaneous EMCCD and radar meteors were identified. A subset of 36 events were analyzed in detail, with 29 having speed less than 20 km/s. These meteors had G-band magnitudes at the specular radar point between +4 and +7.7, with an average radiant power of 5W (assuming a 945 W power for a zero magnitude meteor) and masses of 1 - 10 mg. These correspond to a typical magnitude of +6. We find that $β$ / $τ$ strongly correlates with radiant power. All our simultaneous meteors had asteroidal-like orbits and six were found to be probable iron meteoroids, representing 20 percent of our slow velocity sample. Luminous efficiency values averaged 0.6% at low speed, ranging from less than 0.1% to almost 30%. No trend of luminous efficiency with speed was apparent, though a weak correlation between higher values of luminous efficiency and radiant power may be present.
