福衛三號電子濃度資料分析：電離層E層

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姓名

吳剛宏(Kang-Hung Wu) 查詢紙本館藏

畢業系所

太空科學研究所

論文名稱

福衛三號電子濃度資料分析：電離層E層
(An analysis of FORMOSAT-3/COSMIC-retrieved electron density profile in E-region)

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摘要(中)

利用福衛三號(FORMOSAT-3/COSMIC)得到最新觀測資料，反演出的電子濃度資料擁有良好的時間空間解析。在本篇論文中，我們收集20個月份的資料(從2006年7月到2008年2月)，並且制定一套簡易的篩選流程去挑出符合物理意義的資料。首先，挑選地球磁場寧靜時期的資料(Kp指數<4)。第二，挑選90公里到150公里的電子濃度資料，並且確認對應的電離層E層峰值高度和峰值濃度。去除有問題的資料後，我們探討電離層E層峰值高度和峰值濃度的全球變化。峰值濃度和峰值高度顯示緯度面上擁有異常現象。峰值濃度顯示最大值在地磁緯度30度、0度和-30度處，受到地球磁場控制，並且隨著太陽天頂角去移動。峰值高度顯示最大值位於磁赤道兩側15度到20度間。除此之外，我們利用查普曼層的推論去湊合觀測資料值。我們的結果顯示觀測值和查普曼層理論值大致上符合，並且在日落日出處，有顯著的高度抬昇。另外，在磁赤道附近的電子濃度擾動有強烈的經度方向變化。

摘要(英)

New observations obtained by the FORMOSAT-3/COSMIC satellite constellation reveal a good result of electron density profile with nice temporal and spatial coverage. In this study, we collect the data on the basis of 20 month data (July 2006 – February 2008), and develop a simple quality control algorithm to screen the data in harmony with the physical principle that the radio-occultated electron density should follow. First, the data in the geo-magnetic quiet conditions (Kp index < 4) were selected. Second, the electron density profiles between 90km and 150km were chose, and the corresponding peak electron density and peak height in the E-region were identified. After removing the skeptical data, we discuss the global distribution of the peak height and peak electron density in the E-region. The peak electron density and the peak height show an anomalous latitudinal distribution. The peak electron density shows maxima at about 30°,0° and -30° geomagnetic latitude, indicates strong magnetic control and follows the movement of the sub-solar point. The peak height shows maxima at about 15°-20° geomagnetic latitude on both sides of the geomagnetic equator. Furthermore, we fit theoretical curve from the Chapman theory to the observed peak height. Our results indicate that the observation is generally consistent with the Chapman theory, and the peak heights show remarkable raise at sunset and sunrise. In addition, the fluctuations of electron density at the dip equator exhibit a strong dependence on longitude.

關鍵字(中)

★ 福衛三號
★ 電離層
★ 電離層E層
★ 峰值濃度
★ 峰值高度

關鍵字(英)

★ FORMOSAT-3/COSMIC
★ ionosphere
★ E-region
★ peakdensity
★ peakheight

論文目次

第一章前言 1
第二章理論基礎 3
2.1 電離層簡介 3
2.2 電離層分層 16
2.3 GPS系統 22
2.4福爾摩沙衛星三號系統 24
2.5掩星觀測原理 27
第三章資料篩選 36
3.1 Kp index 37
3.2定義電離層E層之峰值高度和峰值濃度 38
3.3資料篩選流程 44
第四章觀測結果與討論 46
4.1電離層E層日間和夜間全球季變化 47
4.2電離層E層全球日變化 54
4.3電離層E層峰值高度和峰值濃度變化 62
4.4 電離層垂直高度變化 74
4.5 電離層E層經度變化 80
第五章結論與未來展望 86
5.1結論 86
5.2未來展望 88
參考資料 90
附錄一 NetCDF 96
附錄二太陽天頂角和地理座標轉地磁座標 103
太陽天頂角 103
地理座標轉地磁座標 104

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指導教授

朱延祥(Yen-Hsyang Chu)

審核日期

2008-6-24

推文