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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Trapped Electron Energy Inferred From Cosmic Noise Absorption Signals Through Drift-Time Analysis in Empirical Electric and Semi-Empirical Magnetic Fields
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Trapped Electron Energy Inferred From Cosmic Noise Absorption Signals Through Drift-Time Analysis in Empirical Electric and Semi-Empirical Magnetic Fields

机译：俘获电子能源推断宇宙噪声通过Drift-Time分析吸收信号经验电气和半经验的磁性字段

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摘要

Riometers are ground-based passive radio receivers that detect cosmic noise emanating from distant stars and galaxies. Some of the radiowave energy from these galactic sources is absorbed in the lower ionosphere by free electrons, precipitated from magnetospheric sources. The eastward motion of magnetospheric electrons, due to the combined effects of convection and gradient and curvature drift, results in a delay in signal between ground stations separated by 100s and 1,000s of kilometers. In this study, the signal delay is used to infer the energy of trapped electrons by employing a full bounce-averaged drift velocity computation using two semi-empirical magnetic field models, an empirical electric field, and 13 Riometer stations in the NORSTAR ground observation network. It is shown statistically, that riometers respond to 20–80 keV electrons, and that the inferred energy rises with an increase in absorption. The inferred energy is also shown to depend on magnetic local time, and the choice of the magnetic field model. This study quantifies the capability to infer magnetically trapped electron energies from riometer signals. This important population of 10s of keV electrons acts as a source of electromagnetic wave energy, necessary for acceleration of trapped electrons to higher energies where they may be hazardous to space hardware.
机译：宇宙噪声测量器地面被动无线电接收器探测宇宙噪声来自遥远恒星和星系。从这些星系被吸收的来源由自由电子低电离层,沉淀磁性层的来源。的磁性层的电子,由于总和对流和梯度和曲率的影响漂移,结果之间的延迟信号地面站分离的100年代和1000年代公里。用来推断捕获的电子的能量雇佣一个完整bounce-averaged漂移速度使用两个半经验计算磁领域模型、实证电场和13所示宇宙噪声测量器站在NORSTAR地面观测网络。宇宙噪声测量器响应20 - 80 keV电子,和推断能量上升增加吸收。也显示当地时间取决于磁,和磁场模型的选择。研究量化推断的能力磁俘获电子的能量宇宙噪声测量器的信号。十年代keV电子充当的一个来源电磁波能量,所必需的加速困电子更高能量,他们可能有害空间硬件。

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