A long wave transverse electric‐transverse magnetic noise prediction model
A long wave transverse electric‐transverse magnetic noise prediction model
复制标题
长波横向电横向磁噪声预测模型
DOI：
10.1029/94rs03181
复制
发表时间：
1995
期刊：
影响因子：
1.6
通讯作者：
E. Field
中科院分区：
文献类型：
--
作者：
C. R. Warber;E. Field
本文描述了一个计算机物理模型，可以预测极低频至极低频波段（10hz至60khz）的水平和垂直极化噪声。由于该波段自然产生的无线电噪声是由闪电产生的，并通过地球电离层波导传播到接收器，因此该模型从平均闪电密度数据开始，从中计算水平和垂直噪声的辐射功率。对辐射功率进行调整，以说明闪电过程中的季节和纬度差异。然后将噪声功率整合到相当大的地理区域，形成水平和垂直等效噪声发射器。使用标准的各向异性长波传播算法和众所周知的地球电离层波导模型，从这些发射机中的每个发射机辐射的功率传播到接收器位置。该模型根据接收功率预测噪声的均方根值、标准差、电压偏差vd以及两个极化噪声的振幅概率分布。由于该模型是基于理论的，因此它也可以在受干扰的电离层条件下预测这些参数。该模型与RMS噪声数据的一致性较好
This paper describes a computerized physical model that predicts both horizontally and vertically polarized noise in the ELF to LF band (10 Hz to 60 kHz). Since naturally occurring radio noise in this band is produced by lightning and propagates to the receiver via the Earth-ionosphere waveguide, the model starts with average lightning flash density data from which it calculates radiated power for horizontal and vertical noise. Adjustments are made to the radiated power to account for seasonal and latitudinal differences in the lightning processes. The noise power is then integrated over fairly large geographic areas to formulate horizontal and vertical equivalent noise transmitters. The power radiated from each of these transmitters is propagated to the receiver location using standard anisotropic long wave propagation algorithms and well-known models of the Earth-ionosphere waveguide. From the received power the model predicts RMS noise, standard deviation, voltage deviation V D , and the amplitude probability distribution of the noise for both polarizations. Since the model is based on theory, it can also predict these parameters under disturbed ionospheric conditions. The model's generally good agreement with RMS noise data is demonstrated