| 用我国地磁资料对磁层大尺度扰动之赤道电急流效应的初步分析 |
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| 引用本文： | 资民筠,高玉芬,沈长寿.用我国地磁资料对磁层大尺度扰动之赤道电急流效应的初步分析[J].地球物理学报,1988,31(3):257-269. |
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| 作者姓名： | 资民筠 高玉芬 沈长寿 |
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| 作者单位： | 1. 北京大学地球物理系;
2. 国家地震局地球物理研究所 |
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| 摘 要： | 本文利用我国琼中、广州、泉州三站1982-1983年地磁Z分量资料,对磁暴主相发展及恢复相初期的赤道电急流变化进行了研究。形态分析、周期叠加和相关分析均表明,不论在何地方时,对应环电流的发展有△Z的负扰（附加东向电急流）;而Dst开始回升则有△Z的正扰（附加西向电急流）。该变化之大小可能受地方时的调制。方差分析、x2-分析等统计检验也认证了上述变化。文中还对△Z正、负扰与极区电急流及极尖区位置的高、低纬向移动进行了讨论。本文结果表明,分析扰日赤道电急流变化应区分磁暴的不同阶段,即区分电动耦合和动力耦合效应。今后应采用大范围台站网资料,进一步得出有关电流系的图象。
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| 关 键 词： | 磁暴 低纬地磁变化 赤道电急流 统计分析 电动耦合 大尺度地磁扰动 |
| 收稿时间： | 1987-06-08 |
A PRELIMINARY STUDY OF THE EFFECT OF LARGE SCALE MAGNETOSPHERIC DISTURBANCE ON EQUATORIAL ELECTROJET BY USING LOW-LATITUDE GEOMAGNETIC DATA OF CHINA |
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| ZI MIN-YUN GAO YU-PEN.A PRELIMINARY STUDY OF THE EFFECT OF LARGE SCALE MAGNETOSPHERIC DISTURBANCE ON EQUATORIAL ELECTROJET BY USING LOW-LATITUDE GEOMAGNETIC DATA OF CHINA[J].Chinese Journal of Geophysics,1988,31(3):257-269. |
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| Authors: | ZI MIN-YUN GAO YU-PEN |
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| Institution: | 1. Department of Geophysics, Peking University, Beijing;
2. Institute of Geophysics, State Seismological Bureau |
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| Abstract: | The ground magnetic data of three low-latitude magnetic observatories in China (Qiong-zhong, Guangzhou, Quanzhou) have been used to study the variation of the equatorial electrojet during the main phase and at the beginning of the recovery phase of strong magnetic stroms. The analysis of variation of the Z-compoment demonstrates that corresponding to the developing of the ring current there is a negative disturbance of AZ (i.e. an additional eastward electrojet), while during the recovering of Dst, there is a positive disturbance (westward electrojet). The tendency is shown at all local times, but the amplitude of the variation may be modulated by the local time. The trend becomes insignificant at the later stage of the storm, or if the storm is not a solitary one but follows another storm closely.The results are tested by the superposed epoch analysis, the correlation analysis, the x2 -analysis and the analysis of variance. The influnce of the polar electrojet and the latitudinal variation of the polar cusp region is also discussed.The research indicates that in the study of equatorial electrojet on disturbed days, it is important to distinguish the features at different storm stages, and to make a distinction between the effects of dynamic coupling and those of electrodynamic coupling. For further study one needs to deduce the global current system by using the data from a world-wide net of ground magnetic stations. |
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| Keywords: | Magnetic storm Geomagnetic variation at low latitude Equatorial electro-jet Statistical analysis Electrodynamic coupling Geomagnetic disturbance of large scale |
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