THE EFFECT OF THE LARGE SCALE MAGNETOSPHERIC DISTURBANCE ON THE EQUATORIAL ELECTROJET——DATA ANALYSIS OF THE LOW-LATITUDINALGEOMAGNETIC STATIONS FROM INDIA AND CHINA
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摘要: 本文利用印度TRIVANDRUM、KODAIKANAL、ANNAMALAINAGAR和中国的琼中等低纬台站1983-1984两年地磁Z分量资料,对磁层大尺度扰动的赤道电急流效应作了进一步研究。形态分析和周期迭加分析结果证实了作者仅用我国地磁资料所得的结论,即对应磁层环电流的发展,有ΔZ的负扰(即附加东向电急流).双站对比和地方时平均法表明,该效应在日侧最大,半夜至黎明前最弱。有关观测特征与模式计算基本相符。Abstract: Z-component of geomagnetic measurements of 1983-1984 from several low-latitudinal stations are used for further study of the effect of the large scale magnetospheric disturbance on the equatorial electrojet. Data presented in this paper are from India (TRI, KOD, ANN, ...) and China (Qiong Zhong, ...). The results of event analysis and superposed epoch analysis confirm the conclution deduced by the same authors in a previous paper using the Chinese data only, i.e. corresponding to the development of the ring current in the magnetosphere, there is a negative perturbation AZ (it means an additional eastward electrojet). The contrast between the results from a pair of stations of different longitudes and the local time distribution of AZshows that the effect is strongest at daytime and weakest from midnight to dawn. It is basically in accordance with the model calculation of the authors. The results also prove the idea that in analysing the variation of the equatorial electrojet on disturbed days, one should distinguish the effects occured at different storm phases, and draw a distinction between the effects of dynamic and electrodynamic couplings, In order to ascertain the local time and the longitudinal variations of the effect, analyses for simultaneous measurements of global distributed stations are necessary.
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