论文标题
明显的无线电瞬变映射近地等离子体环境
Apparent radio transients mapping the near-Earth plasma environment
论文作者
论文摘要
我们报告发现明亮，快速的无线电闪光灯持续了数十秒钟，而Aartfaac High-All-All-Sky在60 MHz处发现。这些事件中的绝大多数与已知的明亮无线电来源相吻合，在此类事件期间，最多100个因素都可以照亮。我们将它们归因于地球附近血浆引起的放大事件，很可能在电离层的最密集部分中。它们可以在相对隔离的离子层条件下以及在更湍流的电离层条件下进行相对隔离。使用玩具模型，我们表明，更极端（高达100倍）放大事件的可能起源可能起源于电离层中峰值电子密度区域，高度为300-400 km。将这些事件与真正的天体物理瞬变区分开是必须将来的调查在一分钟以下的时间尺度上搜索低频无线电瞬变。
We report the discovery of bright, fast, radio flashes lasting tens of seconds with the AARTFAAC high-cadence all-sky survey at 60 MHz. The vast majority of these coincide with known, bright radio sources that brighten by factors of up to 100 during such an event. We attribute them to magnification events induced by plasma near the Earth, most likely in the densest parts of the ionosphere. They can occur both in relative isolation, during otherwise quiescent ionospheric conditions, and in large clusters during more turbulent ionospheric conditions. Using a toy model, we show that the likely origin of the more extreme (up to a factor of 100 or so) magnification events likely originate in the region of peak electron density in the ionosphere, at an altitude of 300-400 km. Distinguishing these events from genuine astrophysical transients is imperative for future surveys searching for low frequency radio transient at timescales below a minute.
