A New Analysis of the Geomagnetic Sq Field
A New Analysis of the Geomagnetic Sq Field
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地磁方场的新分析
DOI：
10.5636/jgg.25.259
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发表时间：
1973
期刊：
影响因子：
--
通讯作者：
A. Suzuki
中科院分区：
文献类型：
--
作者：
A. Suzuki
本文用一种新的方法分析了地磁太阳静日变化场Sq，并与MATSUSHITA和MAEDA（1965）的结果进行了比较。新方法的目的是为了避免由于赤道电喷流纬向宽度窄而在谐波分析中产生的误差;赤道电喷流产生的磁效应被暂时忽略，直到球谐分析完成后，再将其加入。与Matsushita和Maeda的结果相比，发现：（1）Sq场的球谐系数普遍变小。(2)（3）影响喷流效应的主要系数有a16、a110、b16、b110、a27、a211等;它们变得相当小。在这些项中的许多项中，外部部分与内部部分的振幅比Emn/Imn也变得更小。(4)主项的振幅比Emn/Imn变大。
The geomagnetic solar quiet daily variation field, Sq, was analyzed by a new method and the result was compared with that of MATSUSHITA and MAEDA (1965). The new method is intended to avoid errors which occur in harmonic analysis due to the equatorial electrojet of narrow latitudinal width; the magnetic effect originating from equatorial electrojet currents is temporarily omitted until after the spherical harmonic analysis has been performed, and later the effect is added in. Compared with the results obtained by Matsushita and Maeda, it is found that: (1) Spherical harmonic coefficients for the Sq field generally become smaller. (2) Magnitude of the equivalent current systems external to the earth diminishes by 10-20 per cent. (3) The coefficients which are mainly responsible for the jet effect are a16, a110, b16, b110, a27, a211, etc.; they become considerably smaller. In many of these terms the amplitude ratio Emn/Imn of the external to the internal part also becomes smaller. (4) The amplitude ratios, Emn/Imn, for main terms become larger.