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研究生： 孫慈寬
Tzu-Kuan Sun
論文名稱： 台灣上空F域公尺級場列不規則體沿磁力線映射之研究
指導教授： 朱延祥
Yen-Hsyang Chu
口試委員:
學位類別： 碩士
Master
系所名稱： 地球科學學院 - 太空科學與工程學系
Department of Space Science and Engineering
論文出版年： 2019
畢業學年度： 108
語文別： 中文
論文頁數： 123
中文關鍵詞： 電離層擴散F 、電場映射 、場沿不規則體 、特高頻雷達 、雷達干涉法
外文關鍵詞： Ionosphere spread-F, Mapping of electric field, Field-aligned irregularity, VHF radar, Radar interferometry
相關次數： 點閱：11  下載：0 
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    • 電離層不規則體過去曾由不同儀器進行研究，本文以架設在中壢與太麻里的特高頻雷達站共同觀測，分析跨越同一條磁力線但地點不同的電離層場列不規則體，其有利於研究台灣上空F層電漿不規則體特性。
    在2018/07/04白天時兩地同時觀測到F層場列不規則體，分析過程中發現兩地F層不規則體回波資料在時間上有重疊的區域，且都是自西向東的飄移、相似的頻譜寬以及都卜勒速度皆為遠離雷達方向，隨時間有增大的趨勢，並利用雷達干涉法將不規則體定位在經緯度上，比對兩地不規則體於時間、空間中的關係，透過以上觀測結果驗證磁赤道上空電場沿著磁力線映射到低緯度區域，造成當地電漿不規則體生成與飄移，才使同一條磁力線上有相似的動力行為。

    Ionospheric irregularities have been studied by different instruments in the past. This paper observed by using two VHF radar stations located in Chungli and Taimali, and analyzed the field-aligned irregularities of the ionosphere that across the same magnetic field line but different locations. It is conducive to study the characteristics of the F-layer plasma irregularities over Taiwan.
    During the daytime of 2018/07/04, the F-region field-aligned irregularities were observed simultaneously. During the analysis, we found that the echo data of F-region irregularities in two places are very similar in the east-west motion, the spectrum width and the Doppler velocity. The radar interferometry method is used to locate irregularities on latitude-longitude plane, comparing the relationship between the irregularities in time and space. Through the observations above, it is verified that the electric field on the magnetic equator mapping along the magnetic field lines to the low latitude area, causing local plasma irregularities to generate and drift, so that the same magnetic field line has similar dynamic behavior.

    摘要......................................................i Abstract.................................................ii 誌謝....................................................iii 目錄......................................................v 圖表目錄.................................................vii 第一章 前言 1.1研究動機................................................1 1.2中壢特高頻雷達天線陣列規格與特性..........................3 1.3太麻里特高頻雷達天線陣列規格與特性.......................11 第二章 理論基礎 2.1中緯度Spread-F產生機制與特性............................15 2.1.1赤道離子異常.........................................15 2.1.2 Rayleigh-Taylor instability機制....................16 2.1.3電離層電子密度場列不規則體與回波特性...................19 2.2利用雷達干涉法對Spread-F不規則體進行定位.................19 2.2.1雷達干涉法理論.......................................19 2.2.2中壢及太麻里雷達陣列干涉方程式.........................21 2.2.3反演Spread-F不規則體三維結構..........................23 第三章 系統初始相位差校正 3.1國際地磁參考模型(IGRF)簡介..............................27 3.2計算預測回波區方程式....................................28 3.3中壢與太麻里雷達之F層預測回波區特性......................29 3.4系統初始相位差.........................................39 3.5利用IGRF預測回波區進行太麻里雷達系統初始相位校正..........40 3.6利用IGRF預測回波區進行中壢雷達系統初始相位校正............42 第四章 資料取得與處理 4.1中壢與太麻里雷達參數及雷達觀測特性.......................45 4.2回波訊號處理...........................................46 4.3回波頻譜與Moment Method分析頻譜特性.....................51 4.4處理Barker code所造成的影響............................57 4.5互相關頻譜、相位差頻譜、相關係數頻譜.....................61 4.6電離層Spread-F的三維空間結構與定位......................67 第五章 觀測結果與分析討論 5.1同步觀測日間F層場列不規則體.............................70 5.2不規則體的頻譜寬、都卜勒速度、平均飄移速度比對統計........71 5.3不規則體東向飄移速度計算與分析...........................80 5.4太麻里與中壢不規則體在空間中的位置關係...................82 5.5中壢F層與E層場列不規則體特徵比較.........................97 5.6小結..................................................99 5.7太麻里發生中壢沒發生的事件.............................100 第六章 結論與未來展望 6.1結論.................................................104 6.2未來展望..............................................106 參考文獻.................................................107

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