Electric currents in the ionosphere - The conductivity
Electric currents in the ionosphere - The conductivity
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电离层中的电流 - 电导率
DOI：
10.1098/rsta.1953.0016
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发表时间：
1953
期刊：
影响因子：
--
通讯作者：
D. F. Martyn
中科院分区：
文献类型：
--
作者：
W. Baker;D. F. Martyn
马丁早期提出的发电机理论中电离层的有效电导率因霍尔电流的极化而增强的建议得到了定量详细的检验。给出了与均匀磁场成一定角度取向的电离薄片电导率的一般表达式。这样一个（球形）片包围地球的有效电导率被证明是大于佩德森或霍尔电导率。计算了电离层最大有效电导率水平的电导率随纬度的变化。考虑了实际电离层的高度积分电导率，并推导出有效值。结果表明，F2区将移动身体的电场的影响下，从较低的区域，从而降低其分流霍尔极化场的能力。地球大部分地区的有效电导率足以满足Stewart发电机理论。在赤道的狭长地带，导电性增强，从而解释了在这些地区发生的异常大的磁场变化。
An earlier suggestion by Martyn that the effective conductivity of the ionosphere in the dynamo theory is enhanced by polarization of the Hall current is examined in quantitative detail. General expressions are given for the conductivities of a thin ionized sheet oriented at an angle to a uniform magnetic field. The effective conductivity of such a (spherical) sheet surrounding the earth is shown to be greater than either the Pedersen or the Hall conductivities. The variation of conductivity with latitude is calculated for the ionospheric level of maximum effective conductivity. Consideration is given to the height-integrated conductivity of the actual ionosphere, and effective values deduced. It is shown that the F2 region will move bodily under the influence of the electric field from lower regions, thereby reducing its ability to shunt the Hall polarization field. The effective conductivity over most of the earth is found to be sufficient to satisfy Stewart’s dynamo theory. In a narrow strip at the equator the conductivity is enhanced, thereby accounting for the anomalously large magnetic variations found to occur in these regions.