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A two year survey for VLF emission from fireballs

机译：为期两年的火球VLF排放调查

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摘要

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 light curves. 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., 2008). 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.
机译：在这里，我们报告进行了为期两年的连续调查，以检查与流星比-5亮的流星相关的可能的VLF信号。我们的调查允许在VLF信号和火球光曲线之间校准时空相关性。我们使用来自大气电磁系统的连续观测进行观测建模和教育（AWESOME）VLF接收器系统（Cohen等，2010），该系统部署在加拿大安大略省伦敦附近的埃尔金菲尔德天文台（43N，81W），用于监测VLF无线电信号并与火球的全天候视频记录相关联。该调查于2017年5月至2019年3月进行，使用的是南安大略省流星网络检测到的火球（Brown等，2010; Weryk等，2008）。 AWESOME系统的GPS条件定时与视频流中的视频记录连续不断地同步，以确保子帧VLF光学时间校准。 AWESOME系统有两个正交的VLF天线，可以对输入的VLF信号进行定向计算，并将其与同时检测到的火球的光学测量位置进行比较。针对国家闪电检测网络（NLDN）数据库检查了可能与火球相关的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80多个明亮的流星（表观亮度大于-5，最亮的记录事件为-7.8），并与AWESOME系统检测到的VLF信号进行了比较。尚未找到有关流星VLF排放直至-7.8的极限量的确切证据。

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  • 来源
    《Planetary and space science》 |2020年第5期|104872.1-104872.10|共10页
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  • 作者单位

    Univ Western Ontario Dept Phys & Astron London ON N6A 3K7 Canada;

    Univ Western Ontario Dept Phys & Astron London ON N6A 3K7 Canada|Univ Western Ontario Ctr Planetary Sci & Explorat London ON N6A 5B7 Canada;

    Univ Colorado Boulder Ann & HJ Smead Dept Aerosp Engn Sci Boulder CO 80303 USA;

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  • 正文语种 eng
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  • 关键词

    Meteors; Fireballs; VLF;

    机译：流星;火球;甚低频;

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