局部化源电流对大地电磁响应的高度效应
Altitude effects of localized source currents on magnetotelluric responses
摘要：
局部化源电流对大地电磁（MT）响应的影响已在文献中报道，在周期和地下结构的变化。在这项研究中的重点是在MT响应中所产生的源电流的垂直和水平距离的变化的偏差。在20和200 s的MT响应计算在不同的距离，从源电流。震源距离的微小变化会引起MT响应的偏移，并且偏差很大，特别是在MT数据分析中探索的海拔高度上（即，100 - 150公里），其中E层存在。电离层电导率随高度的分布和控制电离层电过程的区域随时间的变化，导致源场的垂直距离发生变化。因此，在评估MT响应的时间变化时，我们应该通过检查电离层环境来仔细对待它们。
英文摘要：
The effects of localized source currents on Earth's magnetotelluric (MT) responses have been reported in the literature in terms of the changes in period and subsurface structure. The focus in this study is on the bias within the MT responses arising from variations in the vertical and horizontal distances of the source current. The MT responses at 20 and 200 s were calculated at various distances from the source current. A slight change in source distance causes a shift in the MT responses, and the bias is large, especially over the altitudes explored in the MT data analysis (i.e., 100-150 km), where the E layer exists. The vertical distance of the source field varies because the distribution of conductivity with altitude in the ionosphere and the region controlling the ionospheric electrical process change temporally. Thus, in assessing the temporal changes in MT responses, we should treat them carefully by checking the ionospheric environment.
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