利用福爾摩沙衛星三號觀察太陽活動極小期間之閃爍指數變化

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姓名

陳世平(Shih-ping Chen) 查詢紙本館藏

畢業系所

太空科學研究所

論文名稱

利用福爾摩沙衛星三號觀察太陽活動極小期間之閃爍指數變化
(A Study of FORMOSAT-3/COSMIC S4 Index During Solar Minimum)

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摘要(中)

電離層中因為電子不均勻分布，當電波穿過電離層中的不規則體時會受到干擾，稱為電離層閃爍現象。於2006 年運行至今的福爾摩沙衛星三號計畫，藉由接收全球32座GPS 衛星訊號進行掩星觀測分析而得到大氣中物理參數之垂直分布。使用福衛三號的空載GPS 接收機讓使用者得以觀察全球閃爍指數變化，以進一步研究閃爍現象甚至合理推測其成因。本論文藉福爾摩沙衛星三號在2007~2009 年太陽活動極小期間所收集之電離層閃爍指數(S4-index)資料，對閃爍現象之三維空間與時間分布進行討論，並將福爾摩沙衛星三號於電離層F 層高度閃爍指數資料與國際參考電離層(International Referance Ionosphere, IRI)模式之散狀F 層發生機率對照，討論F層閃爍指數與不規則體發生機率的關係。由福衛三號之資料發現在電離層E、F 層高度的閃爍指數資料具有不同的日與季節變化。夏半球E 層閃爍指數北半球大於南半球，秋半球E 層閃爍指數也較春半球強。利用地磁指數(Kp-index)將閃爍指數資料分類，也發現較強的地磁活動對於電離層閃爍具有壓制作用。福衛三號的全球閃爍指數具有明顯的經度效應，國際參考電離層可將福衛三號三維閃爍指數觀測列入參考，以建立完整之閃爍模式。

摘要(英)

Since the Satellite was launched at April 15 ,2006. FORMOSAT 3/COSMIC started offering atmoshperic and ionospheric vertical profile data by analying GPS L1-band signal. Due to the extensive data coverage, users are finally able to working on global ionospheric variation research. This research is using COSMIC scintillation index data in year 2007~2009 by comparing the COSMIC scintillation data in F-region with International Referance Ionosphere(IRI) model spread-F occurrence rate. COSMIC scintillation data in E and F region of ionosphere has different diurnal and seasonal variation. The scintillation index in summer northen hemisphere is larger then the index value in summer southern hemisphere, and it’s larger in autumn hemisphere than in spring hemisphere. We also find out scintillation index shows suppression when strong geomagnetic activity.

關鍵字(中)

★ 福爾摩沙衛星三號
★ 閃爍指數
★ 太陽活動極小期

關鍵字(英)

★ Formosat3/COSMIC
★ s4

論文目次

第一章緒論
1-1 電離層……………………………………………………………………1
1-2 電離層不規則體與訊號閃爍現象………………………………………3
1-3 研究動機…………………………………………………………………7
第二章實驗設計
2-1 福爾摩沙衛星三號………………………………………………………8
2-2 S4閃爍指數……………………………………………………………14
第三章結果與詮釋
3-1 福衛三號E 層閃爍指數觀測…………………………………………19
3-2 福衛三號F 層閃爍指數觀測…………………………………………36
第四章討論與結論 ………………………………………………………51
參考文獻……………………………………………………………………61
附錄…………………………………………………………………………64
VI
附錄A 2008~2009 年F 層高度閃爍指數隨緯度日變化…………………64
附錄B 2008~2009 年各月分北半球F 層高度之閃爍指數資料日變化…68
附錄C 2008~2009 年各月份閃爍指數於F 層高度隨緯度之日變化……72
附錄D 2007~2009 年南半球不同緯度帶E 層高度閃爍指數隨高度之日變化……73
附錄E 2007~2009 年南半球不同緯度帶F 層高度閃爍指數隨高度之日變化……75

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指導教授

劉正彥(Jann-yend Liu)

審核日期

2010-7-22

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