| 磁层亚暴期间高纬地区三维电流体系 |
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| 引用本文： | 孙炜.磁层亚暴期间高纬地区三维电流体系[J].地球物理学报,1986,29(4):407-418. |
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| 作者姓名： | 孙炜 |
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| 作者单位： | 中国科学院地球物理研究所, 北京 |
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| 摘 要： | 确定亚暴期间高纬地区的三维电流体系是磁层和电离层物理的基本问题之一,本文简述了近年来发展的根据地面地磁活动的记录及演三维电流体系的两种较新的方法:KRM（Kamide-Richmond-Matsushita）方法和K（Kisabeth）方法.在KRM方法和许多其它类似的计算中,都假定磁力线是垂直于电离层沿地球径向的直线.本文介绍了一种递推方法,可计算场向电流沿弯曲的偶极子场线流动的情况。同时,还介绍了高纬三维电流体系对亚暴期间中低纬度地磁扰动的贡献。最后介绍了在计算电流体系时所需的电离层电导率模式。
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| 关 键 词： | 电流体系 场向电流 Hall电导率 电离层电流 磁层亚暴 电离层电导率 地磁扰动 偶极子场 子午链 三维 |
| 收稿时间： | 1985-12-10 |
THREE-DIMENSIONAL CURRENT SYSTEM AT HIGH-LATITUDE DURING SUBSTORM |
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| SUN WEI.THREE-DIMENSIONAL CURRENT SYSTEM AT HIGH-LATITUDE DURING SUBSTORM[J].Chinese Journal of Geophysics,1986,29(4):407-418. |
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| Authors: | SUN WEI |
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| Institution: | Institute of Geophysics, Academia Sinica, Beijing |
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| Abstract: | Determination of three-dimensional current system at the high-latitude associatedwith substorm is an important aspect of magnetospheric and ionospheric physics.Twomethods, KRM and Kisabeth's methods, which can be used to invert, three-dimensionalcurrent system on the basis of the ground magnetic records are introduced in this paper.A radial field line was assumed in KRM and other similar methods. A new iterationscheme was presented by Sun et al. （1985） to estimate the effect of the curved fieldline. It was found that the correction to the ionospheric and field-aligned currentsobtained from KRM method is 5-20% in the high latitude （60°-80°） and is 15-35%in the middle latitude （<60°）. Another interesting topic is the coupling between highand low latitudes during substorm. As an example, Sun et al. （1984） estimated magneticdisturbances at middle latitude produced by three-dimensional current system at highlatitude during substorm. It was concluded that the assymetric magnetic variations atthe middle latitude can be attributed to three-dimensional current system, paticularlyfield-aligned current, at the high latitude. Finally, a few kind of conductivity modelsin the ionosphere are introduced which play important roles in estimating the electricfield and current in the ionosphere. |
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