Analysis of FORTE data to extract ionospheric parameters
Analysis of FORTE data to extract ionospheric parameters
复制标题
分析 FORTE 数据以提取电离层参数
DOI：
10.1029/2000rs002587
复制
发表时间：
2001
期刊：
影响因子：
1.6
通讯作者：
L. Triplett
中科院分区：
文献类型：
--
作者：
R. Roussel;A. Jacobson;L. Triplett
本文导出了具有任意径向电子密度分布的球对称电离层的电离层传递函数，其中所关心的无线电频率ω远大于等离子体频率ωpe。将传递函数按参数X（= ω 2 pe/ω2）展开到二阶。在这个极限下，电离层的色散特性表现为频率依赖的到达时间，包括以1/ω表示的二次、三次和四次项。这些项的系数分别与沿着从发射器到接收器的倾斜路径的总电子含量（TEC）、TEC和沿沿着倾斜路径的纵向磁场强度的乘积以及折射弯曲和高阶电子密度分布效应有关。通过将跨电离层信号的到达时间与频率拟合为1/ω的多项式，可以提取TEC、纵向磁场强度、峰值电子密度和电离层的有效厚度。这一练习是针对由FORTE卫星接收器在甚高频中测量并由洛斯阿拉莫斯便携式脉冲发生器产生的一些跨电离层脉冲进行的。结果进行了比较，来自国际参考电离层和美国地质调查局地磁场模型的预测。
The ionospheric transfer function is derived for a spherically symmetric ionosphere with an arbitrary radial electron density profile in the limit where the radio frequencies of interest ω are much larger than the plasma frequency ωpe. An expansion of the transfer function to second order in the parameter X (= ω2pe/ω2) is carried out. In this limit the dispersive properties of the ionosphere are manifested as a frequency‐dependent time of arrival that includes quadratic, cubic, and quartic terms in 1/ω. The coefficients of these terms are related to the total electron content (TEC) along the slant path from transmitter to receiver, the product of TEC and the longitudinal magnetic field strength along the slant path, and refractive bending and higher‐order electron density profile effects, respectively. By fitting the time of arrival versus frequency of a transionospheric signal to a polynomial in 1/ω it is possible to extract the TEC, the longitudinal magnetic field strength, the peak electron density, and an effective thickness for the ionosphere. This exercise was carried out for a number of transionospheric pulses measured in the VHF by the FORTE satellite receiver and generated by the Los Alamos Portable Pulser. The results are compared with predictions derived from the International Reference Ionosphere and the United States Geological Survey geomagnetic field model.