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姓名 高偉仁(William Kao) 查詢紙本館藏 畢業系所 太空科學研究所 論文名稱 極端AU指數事件之研究
(A study of events with extreme AU index)相關論文 檔案 [Endnote RIS 格式] [Bibtex 格式] [相關文章] [文章引用] [完整記錄] [館藏目錄] [檢視] [下載]
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摘要(中) AU指數主要用來測量當磁副暴發生時,極光區東向電噴流對地面所造成的磁場擾動(向北為正)。一般來說AU指數會大於零,然而我們發現在2005年8月24日這天卻有連續約一小時的時間AU都小於零,於是開始尋找類似的事件。我們蒐集了1998年2月5日到2013年10月21日的資料,經過篩選後,我們得到了超過五分之四的極端負AU事件發生於行星際磁場(IMF)同時有晨向分量與南向分量的時候。我們以類似作法分析了AU很大的事件,發現了超過五分之四的極端正AU事件發生於IMF有黃昏向分量的時候。並且我們也討論與分析了SymH對AU造成的影響,發現當AU愈負,SymH對AU的貢獻度愈低。同時我們也反過來探討在行星際磁場南向分量夠強的事件中,IMF By的正負對AU指數造成的影響。我們發現IMF By愈負,極端負AU事件發生機率愈高。最後我們將SuperMAG的資料加入分析後,找到了極端負AU事件可能與東向電噴流位置往赤道方向移動有關的證據。 摘要(英) AU index is designed to measure the substorm magnetic disturbance on the ground due to eastward auroral electrojet. AU index is usually greater than zero, but we find an event with AU much less than zero on 24 August 2005. So we start looking for other similar events. We analyze data from 5 February 1998 to 21 October 2013 and find 80% of the extreme negative-AU events occurred when the interplanetary magnetic field (IMF) has dawnward and southward components. We apply the similar analysis to large AU events and find 80% of the extreme positive-AU events occurred when IMF is duskward. We also analyze the effect of SymH and find that the contribution of SymH decreases with decreasing AU in the negative-AU events. We also examine the sufficient conditions for the occurrence of the extreme negative-AU events. We find that the occurrence of the extreme negative-AU events increases with increasing dawnward component of the IMF when the IMF has a clear southward component. Finally, we analyze the SuperMAG data, and find the possible evidence of equatorward movement of the eastward electrojet during the extreme negative-AU events. 關鍵字(中) ★ 磁副暴
★ 電噴流關鍵字(英) ★ substorm
★ electrojet論文目次 摘要...i
Abstract...ii
致謝...iv
目錄...v
圖目錄...vii
表目錄...xi
第一章 緒論...1
1.1 磁暴與磁暴相關指數...1
1.2 磁副暴與磁副暴相關指數...4
1.3 Kp指數...12
1.4 研究動機...13
第二章 資料統計分析與結果..16
2.1 ACE太空船(Advanced Composition Explorer)..16
2.2 AU < 0單一事件分析..17
2.3 AU < 0事件與IMF統計分析...22
2.4 AU >> 0事件與IMF統計分析...31
第三章 討論...38
3.1 SymH對AU造成的影響...39
3.2 行星際磁場南向分量夠強時,晨昏分量對AU指數的影響...42
3.3 SuperMAG指數...48
3.4 極端AU事件發生與日夜分布之關係...50
3.4.1 AU < −10 nT事件與日夜分布之統計分析...50
3.4.2 AU > 500 nT事件與日夜分布之統計分析...53
第四章 總結...57
參考資料...59
附錄A GSM座標系說明 ...63
附錄B 相近事件合併方法...65
附錄C SuperMAG資料問題...67
附錄D 太陽風速不均勻造成的問題...69
參考文獻 A.參考文獻
[1]Akasofu, S.-I., The development of the auroral substorm, Planet. Space Sci., 12, 273-282, 1964.
[2]Akasofu, S.-I., Y. Kamide, and J. L. Kisabeth, Comparison of two modeling methods for three-dimensionalcurrent systems, J. Geophys. Res., 86, 3389, 1981.
[3]Bartels, J., The standardized index, Ks, and the planetary index, Kp, Int. Union Geod. Geophys. IATME Bull., no. 12b, 97, 1949.
[4]Davis, T. N., and M. Sugiura, Auroral electrojet activity index AE and its universal time variations, J. Geophys. Res., 71, 785, 1966.
[5]Friis-Christensen, E., Polar cap current systems, in Magnetospheric Currents, ed. by T.A. Potemra, Amer. Geophys. U., Washington, DC, 86, 1984.
[6]Feldstein, Y. I., Popov, V. A., Cumnock, J. A., Prigancova, A., Blomberg, L. G., Kozyra, J. U., Tsurutani, B. T., Gromova, L. I., and Levitin, A. E., Auroral electrojets and boundaries of plasma domains in the magnetosphere during magnetically disturbed intervals, Ann. Geophys., 24, 2243–2276, doi:10.5194/angeo-24- 2243-2006, 2006.
[7]Gjerloev, J. W., The SuperMAG data processing technique, J. Geophys. Res., 117 , A09213, doi:10.1029/2012JA017683, 2012.
[8]Iijima T., and T. A. Potemra, Large-scale characteristics of field-aligned currents associated with substorms, J. Geophys. Res., 83, 599, 1978.
[9]Iyemori, T., T. Araki, T. Kamei, and M. Takeda, Mid-latitude geomagnetic indices ASY and SYM (Provisional) No. 1, 1989, Data Anal. Center for Geomagn. and Space Magn., Kyoto Univ., Kyoto, Japan, 1992. http://wdc.kugi.kyoto-u.ac.jp/aeasy/asy.pdf
[10]Kaufmann, R. L., Substorm currents: Growth phase and onset, J. Geophys. Res., 92, 7471, 1987.
[11]McPherron, R. L., Substorm related change in the geomagnetic tail: The growth phase, Planets, Space Sci., 20, 1521-1539, 1972.
[12]McPherron, R. L., C. T. Russell, and M. P. Aubry, Satellite studies of magnetospheric substorms on August 15, 1968, 9, Phenomenological model for substorms, J. Geophys. Res., 78, 3131, 1973.
[13]Uwamahoro, J., and L. A. McKinnell, Solar and interplanetary precursors of geomagnetic storms in solar cycle 23, Adv. Space Res. 51, 395-410, 2013.
B.參考網頁
[14]Advanced Composition Explorer. (ACE) (cited on March 5, 2014)
http://www.srl.caltech.edu/ACE/
[15]SuperMAG indices. (cited on January 7, 2015)
http://supermag.jhuapl.edu/
[16]The Exploration of the Earth′s Magnetosphere. (cited on April 23, 2015) http://www-spof.gsfc.nasa.gov/Education/Intro.html
[17]The International Service of Geomagnetic Indices. (I.S.G.I) (cited on August 27, 2014)
http://isgi.latmos.ipsl.fr/des_kp_ind.html
[18]World Data Center for Geomagnetism, Kyoto. (WDC Kyoto Observatory) (cited on March 12, 2014)
http://wdc.kugi.kyoto-u.ac.jp/index.html
指導教授 呂凌霄(Ling-Hsiao Lyu) 審核日期 2015-8-20 推文 facebook plurk twitter funp google live udn HD myshare reddit netvibes friend youpush delicious baidu 網路書籤 Google bookmarks del.icio.us hemidemi myshare