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題名 | The Solar Wind Control of the Magnetopause Shape: A Comparison of A Model Magnetopause and Empirical Models=太陽風對磁層頂形狀之影響:理論模型與實驗模型之比較 |
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作者 | 鄭慶章; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷期 | 9:2 1998.06[民87.06] |
頁次 | 頁239-254 |
分類號 | 338.8 |
關鍵詞 | 太陽風; 磁層頂形狀; Solar wind; Magnetopause; IMF; |
語文 | 英文(English) |
英文摘要 | The solar wind control of the magnetopause shape is studied with a model magnetopause that results from three sources of magnetic field. One source is the geomagnetic field produced by the Earth's dipole. Another results from an image dipole placed in front of the magnetopause to produce the effect of the magnetopause current which limits the spatial extent of the geomagnetic field. The third is a southward interplanetary magnetic field (IMF) in the Earth's vicinity. With an image dipole strength and the location to account for the effect of the solar wind dynamic pressure (D�b), the shape of the model magnetopause can be regarded as controlled by D�b and the southward IMF. As an image dipole strength is about fourteen times the Earth's dipole and the location is at thirty times the Earth's radius, the shape of the model magnetopause is consistent with observational results for a southward IMF. A comparison of the shape of the model magnetopause and an empirical model by Shue et al. (1997) shows that the image dipole strength at a fixed location correlates linearly with D�b for a southward IMF. In addition, they agree qualitatively for high D�b and a southward IMF. |
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