簡易檢索 / 詳目顯示
| 研究生： |
陳怡璇 Yi-shyuan Chen |
|---|---|
| 論文名稱： |
太陽風對地球磁層頂內側磁場之影響 SolarWind Control of the Geomagnetic Field insidethe Magnetopause |
| 指導教授： |
許志浤
Jih-hong Shue |
| 口試委員: | |
| 學位類別： |
碩士 Master |
| 系所名稱： |
地球科學學院 - 太空科學研究所 Graduate Institute of Space Science |
| 畢業學年度： | 97 |
| 語文別： | 中文 |
| 論文頁數： | 66 |
| 中文關鍵詞： | 地球磁層頂內側磁場 |
| 外文關鍵詞： | geomagnetic field |
| 相關次數： | 點閱：18 下載：0 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
磁層頂的位置和形狀主要取決於太陽風的動壓和地球磁層內的磁壓平衡。本篇文章為了討論磁層頂內側磁場與地球磁偶極場的比值，我們使用了THEMIS任務中的五顆衛星的資料。利用五顆衛星擁有相同酬載的優點當作我們觀測資料的來源。經過資料處理之後我們發現日側磁層頂內側磁場與地球磁偶極場的比值與靜止平衡距離在南向行星際磁場（Southward IMF）的時候會呈現正比的關係。此外在北向行星際磁場的時候，磁層頂內側磁場會隨著靜止平衡距離的-2.6次方而變化；在南向行星際磁場的時候，磁層頂內側磁場會隨著靜止平衡距離的-1.9次方而變化。這有別於地球磁偶極場隨著靜止平衡距離的-3.0次方而改變，藉由磁層頂內側磁場與靜止平衡距離之間的關係可以得到一個最佳的方程式。
The pressure is balanced at the magnetopause where separates the shocked solar wind and the compressed geomagnetic field. In this research, we use the magnetic fields from five THEMIS probes and the theoretical dipole magnetic field model to calculate the ratio of the compressed geomagnetic field just inside the magnetopause to the dipole magnetic field. Here we find that the ratio is linearly proportional to the subsolar standoff distance. Additionally, we also research the relation between the compressed geomagnetic field and the subsolar distance. Here we also find that the compressed geomagnetic field varies with the subsolar distance in a power law of -2.6 (-1.9) on the Northward (Southward) IMF, which is different from that estimated from the dipole magnetic field (-3.0). Furthermore, this relation can be turned into a function of the compressed geomagnetic field in terms of the subsolar distance.
〔1〕Aubry, M. P., C. T. Russell, and M. G, Kivelson, “On inward motion of the magnetopause preceding a substorm”, J. Geophys. Res., 75, 7018-7031, 1970.
〔2〕Glassmeier, K. H., H. Auster, D. Constantinescu, K. Fornacon, Y. Narita, F. Plaschke, V. Angelopoulos, E. Georgescu, W. Baumjohann, W. Magnes, R. Nakamura, C. W. Carlson, S. Frey, J. P. McFadden, T. D. Phan, I. R. Mann, I. J. Rae, and J. Vogt, “Magnetospheric quasi-static response to the dynamic magnetosheath: A THEMIS case study”, Geophys. Res. Lett. 35, L17S01, doi:10.1029/2008GL033469, 2008.
〔3〕Korte, M. and C. Constable, “The geomagnetic dipole moment over the last 7000 years - new results from a global model”, Earth and Planetary Science Letters, 236, 348-358, 2005.
〔4〕Kivelson, M. G. and C. T. Russell, Introduction to Space Physics, Cambridge University Press, 1995.
〔5〕Tsyganenko, N. A., and D. G. Sibeck, “Concerning flux erosion from the dayside magnetosphere”, J. Geophys. Res., 99, 13,425-13,436, 1994.
〔6〕Russell, C. T. and R. L. McPherron, “The magnetotail and substorms”, Space Sci. Rev., 15, 205-266, 1973.
〔7〕Russell, C. T., “The ISEE 1 and 2 Fluxgate Magnetometers”, IEEE Transactions on Geoscience Electronics, vol. GE-16, 239-242, 1978.
〔8〕Russell, C. T., J. G. Luhmann, J. H. Shirley(Eds) and R. W. Fainbridge(Eds), Encylopedia of Planetary Sciences, Springer, New York, 1997.
〔9〕Sibeck D.G., “Signature of flux erosion from the dayside magnetosphere”, J. Geophys. Res., 99, 8513-8529, 1994.
〔10〕Schield, M. A., Pressure balance between solar wind and magnetosphere, J. Geophys. Res., 74, 1275, 1969.
〔11〕Wiltberger, M., R. E. Lopez, and J. G. Lyon, “Magnetopause erosion： A global view from MHD simulation”, J. Geophys., Res. 108, 235, doi:10.1029/2002JA009564, 2003.
