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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >A Study on Meteor Head Echo Using a Probabilistic Detection Model at Jicamarca
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A Study on Meteor Head Echo Using a Probabilistic Detection Model at Jicamarca

机译：使用概率研究流星头上回声检测模型Jicamarca

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摘要

A coded long pulse is applied to the Jicamarca 50 MHz high power large aperture radar to study meteor head echoes. We develop a probabilistic detection model, which finds 25% more meteors than the commonly used signal-to-noise threshold method. The long code and the probabilistic approach allow us to detect over 180 meteors per minute during the dawn hours, which is several times higher than reported previously. The typical mass of the meteoroids is estimated to be about 10?9 kg, slightly smaller than other sensitive very-high-frequency and ultrahigh-frequency high power large aperture radars except the Arecibo radar. The high sensitivity allows us to observe numerous meteors in the presence of the strongest equatorial electrojet. We report and discuss the characteristics of meteor flux rate, ablation height, and velocity with a constant noise power for the first time for the Jicamarca radar. The highest average detection height is found to be near 2 a.m., instead of near 6 a.m. when the largest average velocity is observed. This is likely due to the combination of the relative large atmospheric velocity and the substantial atmospheric entry angles around 2 a.m. The observed characteristics suggest that many meteors are detected 8° off zenith despite that the full beam width is only 2.4°.
机译：编码的长脉冲应用于Jicamarca 50MHz高功率大孔径雷达研究流星回声。检测模型,发现超过25%的流星比常用信噪比阈值方法。方法允许我们检测超过180颗流星在黎明小时分钟,几个倍报道。典型的流星体的质量估计大约10吗?敏感的甚高频和超高频率高功率大光圈除了阿雷西博雷达雷达。灵敏度允许我们观察大量的流星在赤道最强的存在电喷流。流星流量特点,消融高度,以一个恒定的噪声功率和速度第一次Jicamarca雷达。最高平均检测高度是发现2点附近,而不是6点附近时最大平均速度是观察。可能由于相对的结合大大气的速度和实质性的大气输入角度2点左右。观察表明,许多特征流星检测到8°天顶尽管如此完整的波束宽度只有2.4°。

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