溫度非均向性對於地球磁層頂二維結構之影響

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姓名

陳冠文(Guan-Wen Chen) 查詢紙本館藏

畢業系所

太空科學與工程研究所

論文名稱

溫度非均向性對於地球磁層頂二維結構之影響
(The Effects of Temperature Anisotropy on Two-Dimensional Earth’s Magnetopause Structures)

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摘要(中)

Grad-Shafranov（GS）重建方法可以利用單一人造衛星的觀測資料，建構出空間中二維磁場與電漿磁流體力平衡結構的數值分佈，至今已被廣泛運用在重建地球磁層頂的二維結構。溫度非均向性是太空中重要的電漿特性，而過去的GS重建模式均未將此特性包含其中。本論文首次發展以描述電漿熱力狀態的double-polytropic energy closure為基礎、包含溫度非均向性之磁流體GS重建數值模式，且首度利用THEMIS （The Time History of Events and Macroscale Interactions during Substorms）與MMS （Magnetospheric Multiscale）人造衛星穿越地球磁層頂的高解析度觀測資料，重建地球磁層頂之二維磁場與電漿結構，以及探討溫度非均向性與不同的熱力狀態對於磁層頂結構的效應。研究結果顯示，溫度非均向對於磁層頂的磁島結構有顯著的效應，然對於磁重連的X-line結構較無影響。

摘要(英)

Grad-Shafranov (GS) reconstruction method can reveal the two-dimensional magnetohydrodynamic (MHD) equilibrium plasma and magnetic field structures by using spacecraft observational data. The GS reconstruction technique has been widely applied to reconstruct the Earth’s magnetopause structures. The temperature anisotropy is an important characteristic of Earth’s space plasma environments. However, this property has not been considered in the previous GS reconstruction procedures. In this study we first develop the GS reconstruction numerical scheme with temperature anisotropy based on the double-polytropic MHD plasma models. We then apply the GS reconstruction scheme to the Earth’s magnetopause crossing events observed by the THEMIS (The Time History of Events and Macroscale Interactions during Substorms) and MMS (Magnetospheric Multiscale) spacecraft. We analyze the effects of plasma temperature anisotropy and thermodynamics on the Earth’s magnetopause structures. The reconstruction results show that the temperature anisotropy and energy closures may affect the features of magnetic islands within the magnetopause but have less effects on the magnetic reconnection with a single X-line.

關鍵字(中)

★ 磁層頂
★ Grad-Shafranov 重建
★ 磁重連
★ 撕裂模不穩定
★ 溫度非均向

關鍵字(英)

★ Magnetopause
★ Grad-Shafranov reconstruction
★ Magnetic reconnection
★ Tearing instability
★ Anisotropic temperature

論文目次

中文摘要 I
英文摘要 II
目錄 IV
表目錄 VI
圖目錄 VII
第一章緒論 1
第二章 Grad-Shafranov重建方法 8
2.1 Minimum Variance Analysis（MVA） 8
2.2 deHoffmann-Teller（HT）frame 9
2.3 Ideal magnetohydrodynamic（MHD）模式 11
2.4 溫度均向之GS模式 12
2.5 溫度非均向之GS模式 14
2.6 GS重建數值模式 15
2.7 GS重建參考座標 20
2.8 解析解測試 20
第三章磁層頂二維結構重建與分析 27
3.1 THEMIS磁層頂穿越事件 28
3.2 THEMIS磁層頂穿越事件之GS重建 29
3.3 Energy closure的效應 31
3.4 溫度非均向的效應 32
3.5 Field-aligned flow的效應 33
3.6 MMS磁層頂穿越事件 34
3.7 MMS磁層頂穿越事件之GS重建 35
3.8 Energy closure的效應 36
3.9 溫度非均向的效應 37
3.10 Field-aligned flow的效應 38
第四章總結 72
參考文獻 74

參考文獻

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指導教授

郝玲妮(Lin-Ni Hau)

審核日期

2020-12-29

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