流星射电余辉的速率、通量密度和光谱指数
Rates, Flux Densities, and Spectral Indices of Meteor Radio Afterglows
摘要：
使用LWA 1的窄带全天空成像仪模式，我们现在已经检测到30个25.6 MHz的瞬变，1个34 MHz的瞬变，93个38.0 MHz的瞬变。虽然我们只能从光学上证实其中37个事件是流星的无线电余辉，但有证据表明，即使不是全部，也是大多数。使用LWA1的波束形成模式，我们还捕获了四个事件的22.0和55.0 MHz之间的宽带光谱。我们比较了这四个事件的平滑，光谱分量和适合的频率依赖的通量密度的幂律，并发现光谱指数是随时间变化的，随着时间的推移，频谱陡峭的每个流星余辉。使用这些频谱指数以及在25.6和38兆赫的123个事件的窄带通量密度测量，我们预测的预期流量密度和率流星余辉可能观察到的其他低频射电望远镜。
英文摘要：
Using the narrowband all-sky imager mode of the LWA1 we have now detected 30 transients at 25.6 MHz, 1 at 34 MHz, and 93 at 38.0 MHz. While we have only optically confirmed that 37 of these events are radio afterglows from meteors, evidence suggests that most, if not all, are. Using the beam-forming mode of the LWA1 we have also captured the broadband spectra between 22.0 and 55.0 MHz of four events. We compare the smooth, spectral components of these four events and fit the frequency dependent flux density to a power law, and find that the spectral index is time variable, with the spectrum steepening over time for each meteor afterglow. Using these spectral indices along with the narrow band flux density measurements of the 123 events at 25.6 and 38 MHz, we predict the expected flux densities and rates for meteor afterglows potentially observable by other low frequency radio telescopes.
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