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系統識別號 U0026-2008201809284100
論文名稱(中文) 地球磁層日側之合唱波事件統計分析
論文名稱(英文) Statistical Study of the Occurrence of Chorus Waves in the Dayside Magnetosphere
校院名稱 成功大學
系所名稱(中) 太空與電漿科學研究所
系所名稱(英) Institute of Space and Plasma Sciences
學年度 106
學期 2
出版年 107
研究生(中文) 林相名
研究生(英文) Hsiang-Ming Lin
學號 LA6011093
學位類別 碩士
語文別 中文
論文頁數 76頁
口試委員 指導教授-談永頤
口試委員-汪愷悌
口試委員-張博宇
中文關鍵字 合唱波  日側地區  電子加熱 
英文關鍵字 chorus waves  dayside  electron heating 
學科別分類
中文摘要 在地球磁層內,有一種右旋極化的電磁波(RHP WAVES)叫做合唱波,它會沿著磁力線傳播且電磁波頻率大約落在大0.1~0.8倍的電子迴旋頻率之間。合唱波會在內磁層中會與電漿中的粒子產生交互作用,使得環境中周圍的電子產生加速的效應。

本研究聚焦在日側地區進行觀測分析,以西密斯衛星中的其中一顆THEMIS-D衛星在西元2010年所做得觀測,並以高時間解析度的磁場資料作為研究的材料,用以探討合唱波於日側地區出現的次數和機率統計,以及與環境的背景磁場和電子溫度進行比對,從而推測合唱波事件發生時,空間位置與背景參數之間是否有影響。

以空間位置來看,觀測到的數據其結果為與合唱波事件於MLT=15時發生的機率最高為32.5%,在L-parameter落在6~10區間,機率為46.76%機率最高,在geocentric distance落在5~8 (Re)區間,機率為60.00%機率為最高。

以環境背景參數背景磁場強度與電子溫度來看,在日側地區背景磁場強度大小的觀測基礎上,我們發現合唱波事件和無合唱波時段所發生的機率曲線高度重合下,因而推論合唱波事件發生與背景磁場強度沒有太大的關係,若以環境的電子溫度來看,我們會發現若合唱波事件發生,普遍來說,周圍的電子溫度大概只可以被加熱到700eV這個區間範圍,且在低溫區域範圍內(電子溫度小於700eV)時,我們可以總結出一個規律,若有發生合唱波事件的整體機率上溫度偏高。
英文摘要 In the Earth’s magnetosphere, chorus waves are a kind of right-handed polarized(RHP) waves with frequency range between 0.1f_ce and 0.8f_ce, where f_ce is the electron cyclotron frequency.

Chorus waves travel along magnetic field lines and interact with the particles causing electron heating in the space environment. This study focuses on the location of the dayside magnetosphere. The magnetic field data come from one of the THEMIS satellites called THD.

In terms of spatial position, according to the observed data, chorus waves occur with maximum probabilities of 32.50% at magnetic local time(MLT)=15, 46.76% at L-parameter between 6 and 10, 60.00% at geocentric distances between 5 and 8 Earth radii (R_E). In terms of the intensity of the background magnetic field, the probability curves of the chorus wave events and time intervals without waves are highly coincident.

We conclude that chorus wave events do not have much relationship with the background magnetic field magnitude. But based on the electron temperature of the environment, it is found that if chorus waves occur, the surrounding electron temperature is most likely heated up to a range of 700 eV, and in the low-temperature range (electron temperature less than 400 eV), we find the following trend: the higher the temperature, the higher probability of finding a chorus wave event.
論文目次 摘要.............i
Abstract............ii
致謝..............v
第一章 緒論............1
1-1 簡介.............1
1-2 研究動機...........2
1-3 論文架構...........3
第二章 合唱波理論背景介紹...........4
2-1 地球磁層的介紹..........4
2-2 內磁層....................6
2-3 范艾倫輻射帶 (Van Allen Radiation Belt) ..........9
2-4 哨聲模合唱波(Whistler-mode Chorus Wave) .......11
第三章 資料分析.................13
3-1 資料介紹.................13
3-2 資料處理方法...............15
3-3 資料分析步驟..............18
第四章 資料分析結果與討論...........21
4-1 合唱波事件分佈..............21
4-2 合唱波的區域分佈............23
4-3 合唱波發生事件與環境背景參數關係 .......40
第五章 結論與未來展望..............62
附錄一........................64
附錄二....................... 65
附錄三........................66
參考文獻......................75
參考文獻 Angelopoulos, V. (2008), The THEMIS Mission, Space Sci. Rev. 141:5.

Burtis, W., and R. Helliwell (1969), Banded chorus ── A new type of VLF radiation observed in the magnetosphere by OGO 1 and OGO 3, J. Geophys. Res., 74(11), 3002-3010.

Horne R.B., R.M. Thorne, S.A. Glauert, J.M. Albert, N.P. Meredith, and R.R. Anderson (2005), Timescale for radiation belt electron acceleration by whistler mode chorus waves, J. Geophys. Res., 110, A03225, doi:10.1029/2004JA010811.

Kivelson, M. G., and Russell, C.T. (1995), Introduction to Space Physics, Cambridge University Press, New York.

Li, W., R. M. Thorne, J. Bortnik, Y. Y. Shprits, Y. Nishimura, V. Angelopoulos, C. Chaston, O. Le Contel, and J. W. Bonnell (2011), Typical properties of rising and fallingtone chorus waves, Geophys. Res. Lett., 38, L14103, doi:10.1029/2011GL047925.

Omura, Y., M. Hikishima, Y. Katoh, D. Summers, and S. Yagitani (2009), Nonlinear mechanisms of lower-band and upper-band VLF chorus emissions in the magnetosphere, J. Geophys. Res., 114, A07217, doi:10.1029/2009JA014206.

Russell, C.T. and J. G. Luhmann (1997), Earth: magnetic field and magnetosphere, in Encyclopedia of Planetary Sciences, pp. 208-211, Chapman and Hall, New York.

Sazhin, S. S., and M. Hayakawa (1992), Manetospheric chorus emissions: A review, Planet. Space Sci., 40(5), 681-697.

Shue, J.-H., Y.-K. Hsieh, S. W. Y. Tam, K. Wang, H. S. Fu, J. Bortnik, X. Tao, W.-C. Hsieh, and G. Pi (2015), Local time distributions of repetition periods for rising tone lower band chorus waves in the magnetosphere, Geophys. Res. Lett., 42, doi: 10.1002/2015GL066107.

Thorne, R. M., W. Li, B. Ni, Q. Ma, J. Bortnik, L. Chen, D. N. Baker, H.E. Spence, G. D. Reeves, M. G. Henderson, C. A. Kletzing, W. S. Kurth, G. B. Hospodarsky, J. B. Blake, J.F. Fennell, S. G. Claudepierre and S. G. Kanekal (2013), Rapid local acceleration of relativistic radiation-belt electrons by magnetospheric chorus, Nature, 504, 411-414, doi:10.1038/nature12889.

Tu, W., G. S. Cunnlngham, Y. Chen, S. K. Morley, G. D. Reeves, J.B. Blake, D. N. Baker, and H. Spence (2014), Event-specific chorus wave and electron seed population models in DREAM3D using the Van Allen Probes, Geophys. Res. Lett., 41, 1359–1366, doi:10.1002/2013GL058819.
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