火球的无线电发射探测
Detection of Radio Emission from Fireballs
摘要：
我们介绍了原型全天空成像仪（PASI）的研究结果，PASI是长波长阵列（LWA1）第一站的后端相关器，它以25至75 MHz的频率记录了超过11，000小时的全天空图像。在搜索无线电瞬变的数据时，我们发现了49个长（10秒）持续时间的瞬变。其中10个瞬变现象在空间和时间上都与大流星（火球）相关，它们的特征表明火球发射了一种以前未发现的低频非热脉冲。这种发射为流星的物理学提供了新的探索，并确定了一种新形式的自然发生的无线电瞬变前景。
英文摘要：
We present the findings from the Prototype All-Sky Imager (PASI), a backend correlator of the first station of the Long Wavelength Array (LWA1), which has recorded over 11,000 hours of all-sky images at frequencies between 25 and 75 MHz. In a search of this data for radio transients, we have found 49 long (10s of seconds) duration transients. Ten of these transients correlate both spatially and temporally with large meteors (fireballs), and their signatures suggest that fireballs emit a previously undiscovered low frequency, non-thermal pulse. This emission provides a new probe into the physics of meteors and identifies a new form of naturally occurring radio transient foreground.
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