博碩士論文 93643601 詳細資訊

以作者查詢圖書館館藏 以作者查詢臺灣博碩士 以作者查詢全國書目 勘誤回報 、線上人數:25 、訪客IP:
姓名 查傑希(PK Rajesh)  查詢紙本館藏   畢業系所 太空科學研究所
論文名稱 低緯度電離層大氣暉光之研究
(Airglow Investigations of the Low-Latitude Ionosphere)
★ 台灣地區1996年散塊E層之變化★ 2000年4月6日磁暴研究
★ 利用GPS觀測與IRI 模擬研究1997及2000年台灣經度赤道異常峰之變化★ 台灣地區1996及2000年電離層散狀F層與全球定位系統相位擾亂之比較
★ 電離層地震前兆之研究★ 電離層波動垂直能量傳播之研究
★ 南美洲磁赤道地區散狀F層於太陽活動極大期之研究★ 台灣地區中界層於第22-23太陽週期間之特性研究
★ 利用全球定位系統觀測電離層地震前兆★ 臺灣地區電離層季節異常與太陽活動之相關性研究
★ 台灣地區地震與閃電之研究★ 台灣地區地震前之電離層電子濃度異常
★ 磁暴時低緯度電離層變化★ 電離層赤道異常與赤道電噴流
★ 日出前及日落後電離層高度變化之研究★ 電離層探測儀與全球定位系統聯合觀測電離層F層電漿密度不規則體
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摘要(中) 本篇論文利用全天式影像儀研究電離層不規則體。全天式影像儀用以觀測夜間之大氣暉光,且可觀測到大尺度的不規則體,即赤道散狀F層。整個觀測系統分別架設在印度的Kavalur (12.5N, 78.8E, 地磁緯度:4.6N) 與台灣的鹿林山 (23.47N, 120.87E, 地磁緯度:13.45N)。全天式影像儀所觀測的大氣暉光波長選定在630.0奈米、557.7奈米以及777.4奈米,因為不同的大氣暉光波長會顯示出大氣暉光耗損不同的特徵。在進行大氣暉光觀測的同時,觀測地附近的電離層探測儀也被用來量測電離層的最低高度,並記錄當大氣暉光耗損存在時,散狀F層是否出現。
摘要(英) This dissertation focuses on the study of ionospheric irregularities using selected airglow emissions whose intensity is related to plasma density. All sky imaging technique is used to observe the large scale ionospheric structures, known as plasma depletions, which are often associated with Equatorial Spread-F (ESF) phenomena. The experiments conducted from Kavalur (12.5N, 78.8E; 4.6N geomagnetic), India, and Mt. Lulin (23.47N, 120.87E; 13.45N Geomagnetic), Taiwan are used in this work. The 630.0, 557.7, and 777.4 nm emissions are used for recording the images. The different emissions reveal different characteristics of depletions. The ionosonde data is used to monitor the base height of the F-layer as well as the presence or absence of Spread-F at the time of the appearance of depletions in all sky images.
Several new features of plasma depletions are revealed in this study such as the new type of ‘joined’ pair of depletions where the northern (and later the southern) ends join together, producing an inverted ‘V’ shape bifurcation, which later merge together, sequences of depletions developing in the field of view of the all sky imager in the post-midnight period, depletions in 630.0 nm images entering the field of view (FOV) as dark patches from the north end in the post-midnight period, and the frequent observations of plasma depletions in 557.7 nm images. The ionospheric conditions resulting in the joining and merging of depletions, and the post-midnight development are discussed. The field aligned mapping of irregularities together with the altitude dependence of the 630.0 nm emission is proposed to be responsible for the 630.0 nm depletions to appear as dark patches at the northern ends of the FOV. A simulation is carried out to understand the important physical parameters that influence the emissions of the 557.7 nm in various local times and solar activities, and result in the appearance of depletions in the integrated images.
An all sky imager has been designed and developed at the Institute of Space Science, National Central University, during the course of this dissertation. The imager was operated from Mt. Lulin, during the new moon periods since August 2006 to study the large scale ionospheric structures. The optical signatures of traveling ionospheric disturbances (TID’s) detected during this period are described. These observations are also used to understand the nocturnal variation of airglow intensity over Taiwan in different wavelengths.
關鍵字(中) ★ 赤道散狀F層
★ 大氣暉光
★ 電離層
關鍵字(英) ★ Equatorial Spread F
★ Airglow
★ Ionosphere
論文目次 Abstract (Chinese) ... i
Abstract (English) ... ii
Acknowledgements ... iv
List of figures ... viii
List of Tables ... xi
1. Introduction ... 1
1.1 Historical Perspective ... 1
1.2 Airglow and Ionosphere ... 4
1.3 Ionospheric Irregularities ... 5
1.4 Airglow Imaging ... 7
1.5 Scope of the Present Work ... 10
2. Theory, Instrument, and Analysis ... 13
2.1 Airglow Chemistry ... 13
2.2 Instrumentation ... 21
2.3 Image Analysis ... 29
3. PRL All Sky Imager Observations ... 33
3.1 Bifurcations, Joining and Merging of Depletions ... 39
3.2 Generation in the FOV ... 52
3.3 Altitude-Latitude Mapping ... 65
3.4 Depletions in 557.7 nm Images ... 75
4 All Sky Imaging from Mt. Lulin ... 92
Conclusions and Future Work ... 106
References ... 111
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指導教授 劉正彥(Jann-Yenq Liu) 審核日期 2007-7-10
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