流星射电余辉光谱分布的宽带成像研究
Broadband Imaging to Study the Spectral Distribution of Meteor Radio Afterglows
摘要：
我们目前的观测86流星无线电余辉（MRA）使用新的宽带成像仪在长波长阵列塞维利亚（LWA-SV）站。使用带宽高达20 MHz的全天空图像检测MRA。我们用幂律和对数正态函数拟合光谱。当用幂律拟合时，光谱从平坦到陡峭变化，并且从拟合导出的光谱指数分布在-1.73处达到峰值。当与对数正态函数拟合时，光谱在30-40 MHz之间的频率处表现出翻转，并且似乎与光谱有更好的函数拟合。我们比较了两种拟合方法的光谱参数与磁共振波谱的物理性质。我们观察到的对数正态转换频率和海拔高度的MRA之间的弱相关性。从幂律拟合的光谱指数没有表现出任何强的相关性与MRA的物理性质。然而，半峰全宽（FWHM）的持续时间与当地的时间，入射角，光度和光学派生的动能的母流星体。此外，平均光度的MRA似乎是相关的动能的母流星体和高度，它们发生。
英文摘要：
We present observations of 86 meteor radio afterglows (MRAs) using the new broadband imager at the Long Wavelength Array Sevilleta (LWA-SV) station. The MRAs were detected using the all-sky images with a bandwidth up to 20 MHz. We fit the spectra with both a power law and a log-normal function. When fit with a power law, the spectra varied from flat to steep and the derived spectral index distribution from the fit peaked at -1.73. When fit with a log-normal function, the spectra exhibits turnovers at frequencies between 30-40 MHz, and appear to be a better functional fit to the spectra. We compared the spectral parameters from the two fitting methods with the physical properties of MRAs. We observe a weak correlation between the log-normal turnover frequency and the altitude of MRAs. The spectral indices from the power law fit do not show any strong correlations with the physical properties of MRAs. However, the full width half maximum (FWHM) duration of MRAs is correlated with the local time, incidence angle, luminosity and optically derived kinetic energy of parent meteoroid. Also, the average luminosity of MRAs seems to be correlated with the kinetic energy of parent meteoroid and the altitude at which they occur.
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