论文标题
对火球排放VLF的两年调查
A Two Year Survey for VLF Emission from Fireballs
论文作者
论文摘要
在这里，我们报告了为期两年的连续调查，以检查与流星更明亮的VLF信号-5。我们的调查允许VLF信号和火球轻曲线之间校准的时间和空间相关性。我们使用大气天气电磁系统中的连续观察来观察模型和教育（很棒）VLF接收器系统（Cohen等，2010）在加拿大安大略省伦敦附近的Elginfield天文台部署（43n，81W），以监视VLF无线电信号，并与所有Sky视频记录的Fireder录像带相关。这项从2017年5月至2019年3月的调查是使用安大略省南部流星网络检测到的火球提示的（Brown等，2010； Weryk等，2007）。直接在视频流中直接与视频录制连续同步GPS条件的时机，以确保子帧VLF光学时间校准。 Awesome系统具有两个正交的VLF天线，允许对传入的VLF信号进行定向计算，这些信号与同时检测到的火球的明显光学测量位置进行了比较。与国家雷电检测网络（NLDN）数据库进行了检查，可能与火球相关的VLF事件，以消除与闪电的假阳性关联。在两年的调查间隔中，检测到超过80个明亮的流星（明显比-5明亮，最亮的录制事件-7.8），并将其与Awesome System检测到的VLF信号进行了比较。没有发现从流星到限制幅度为-7.8的VLF发射的明确证据。
Here we report on a two year continuous survey to examine possible VLF signals associated with meteors brighter than magnitude -5. Our survey allowed both calibrated temporal and spatial correlations between VLF signals and fireball lightcurves. We used continuous observations from the Atmospheric Weather Electromagnetic System for Observation Modeling and Education (AWESOME) VLF receiver system (Cohen et al., 2010) deployed at the Elginfield Observatory near London, Ontario, Canada (43N, 81W) to monitor VLF radio signals and correlate with all-sky video recordings of fireballs. This survey from May 2017 to March 2019 was cued using fireballs detected by the Southern Ontario Meteor Network (Brown et al., 2010; Weryk et al., 2007). The GPS conditioned timing of the AWESOME system was continuously synchronized with video recordings directly in the video stream to ensure sub-frame VLF-optical time calibration. The AWESOME system has two orthogonal VLF antennas which permits directional calculation of incoming VLF signals, which were compared to the apparent optically measured locations of simultaneously detected fireballs. VLF events potentially linked to fireballs were checked against the National Lightning Detection Network (NLDN) database to remove false positive association with lightning. During the two year survey interval, over 80 bright meteors (apparent magnitude brighter than -5, brightest recorded event -7.8) were detected and compared to VLF signals detected by the AWESOME system. No definitive evidence was found for VLF emission from meteors up to a limiting magnitude of -7.8.
