| 行星际磁场扇形结构对中低纬地磁场的影响 |
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| 引用本文： | 徐文耀,师恩琦.行星际磁场扇形结构对中低纬地磁场的影响[J].地球物理学报,1987,30(3):226-235. |
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| 作者姓名： | 徐文耀 师恩琦 |
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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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| 基金项目： | 国家自然科学基金，中国科学院青年基金 |
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| 摘 要： | 本文用特征向量分析法对1973年北京地磁台水平磁场强度H的时均值资料进行了研究,识别出了行星际磁场扇形效应对中低纬地磁场H日变化的贡献。研究结果表明,中低纬扇形效应约为3-5nT的数量级,分点月最大（～5nT）,冬季最小（～3nT）。当扇形磁场背离太阳时,扇形效应引起白天H增大,夜间减小;当扇形磁场朝向太阳时,H的变化相反。用第一特征向量推断行星际磁场的扇形极性,其符合率在两分点月份和夏季达到70％左右,冬季低于50％,暗示了冬季反向扇形效应的存在。
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| 关 键 词： | 扇形结构 扇形效应 中低纬度 特征向量 |
| 收稿时间： | 1986-01-30 |
IMF SECTOR EFFECT ON GEOMAGNETIC FIELD AT MID AND LOW LATITUDES |
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| XU WEN-YAO SHI EN-QI.IMF SECTOR EFFECT ON GEOMAGNETIC FIELD AT MID AND LOW LATITUDES[J].Chinese Journal of Geophysics,1987,30(3):226-235. |
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| Authors: | XU WEN-YAO SHI EN-QI |
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| Affiliation: | Institute of Geophysics, Academia Sinica, Beijing |
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| Abstract: | Geomagnetic data at Beijing and Guangzhou have been analysed by the use of eigenvalue method (or MNOC). The IMF sector effect on the geomagnetic field at mid and low latitudes have been recognized. The magnitude of the sector effect is about 3-5 nT at mid and low latitudes in contrast to tens nT at high latitudes. TheIMF sector effect is larger in equinoctial months (- 5 nT) than the winter (~3 nT). When the IMF is away from (or toward) the sun, the sector effect causes increase (or decrease) of H component at daytime and decrease (or increase) at night. The first eigenvector is used to estimate IMF sector polarities. The agreement of this estimate with satellite observations is~70% in summer and equinoctial months and less than 50% in winter, which implies the inverse sector effect in winter. |
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| Keywords: | Sector structure Sector effect Mid and low latitude Eigenvector |
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