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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >VLF wave intensity in the plasmasphere due to tropospheric lightning
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VLF wave intensity in the plasmasphere due to tropospheric lightning

机译：在等离子体层由于甚低频电波强度对流层闪电

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摘要

A climatology of VLF (very low frequency) wave intensity from lightning in the plasmasphere is constructed. Starting from Optical Transient Detector/Lightning Imaging Sensor (OTD/LIS) lightning data representing 1995-2005, a climatology of strikes is assembled with 1° × 1° latitude-longitude spatial resolution, averaged into 2 h bins for each month of the year. Assuming a linear relationship between optical flash rate and VLF power flux, and that the VLF amplitude drops off as one over distance, a proxy for VLF power is developed. A typical lightning spectrum is applied and the values are scaled by appropriate transionospheric absorptions for each time and place. These values are mapped along geomagnetic field lines in order to compare them to E-field spectral densities measured by the DEMETER satellite between 2005 and 2009. An overview of the DEMETER survey mode data is presented which leads to the best scaling of the lightning VLF climatology in LEO (low earth orbit). The resulting data set represents a monthly, 2-hour, solar minimum climatology of VLF wave intensity from lightning in LEO. Finally, the E-field spectral densities are converted to Poynting flux, mapped to the plasmasphere, and converted to B-field spectral densities. Good overall agreement is found with previous observations and estimates. This new climatology is expected to have a significant impact on calculations of pitch-angle diffusion for relativistic electrons in the inner radiation belt.
机译：气候学的甚低频(甚低频)波从等离子体层中的闪电强度构造。探测器/闪电成像传感器(定单计划/ LIS)闪电数据代表1995 - 2005气候学的罢工组装1°×1°经度的空间分辨率,平均为每月2 h垃圾箱。假设一个线性光学之间的关系闪光率和甚低频功率通量,甚低频振幅随距离而减少下降,一个代理甚低频权力。应用光谱和的值了适当的transionospheric吸收时间和地点。地磁场线来进行比较电谱密度来衡量得墨忒耳卫星在2005年和2009年之间。得墨忒耳的调查数据模式的概述导致的最佳比例闪电甚低频气候学在狮子座(低地球轨道)。月,2小时,太阳能最低的甚低频气候学波强度从狮子座的闪电。电谱密度转换为能流密度通量、映射到等离子体层和转换为磁场谱密度。发现与先前的整体协议观察和估计。预计将有显著影响吗计算的螺旋角扩散相对论电子的辐射带。

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