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系統識別號 U0026-2908201215045400
論文名稱(中文) 平流層瞬間暖化對低緯度電離層的影響
論文名稱(英文) Impact of stratospheric sudden warmings on the low-latitude ionosphere
校院名稱 成功大學
系所名稱(中) 太空天文與電漿科學研究所
系所名稱(英) Assistant, Institute of Space, Astrophysical and Plasma Sciences(ISAPS)
學年度 100
學期 2
出版年 101
研究生(中文) 林佳廷
研究生(英文) Jia-Ting Lin
學號 la6994021
學位類別 碩士
語文別 中文
論文頁數 87頁
口試委員 指導教授-陳炳志
指導教授-林建宏
召集委員-蔡和芳
中文關鍵字 平流層瞬間暖化  電離層  潮汐 
英文關鍵字 stratospheric sudden warming  ionosphere  tides 
學科別分類
中文摘要 先前的研究認為平流層瞬間暖化對於電離層的影響,是由於行星波與潮汐的非線性交互作用所造成。在本論文中,我們使用臺灣福爾摩沙衛星三號掩星觀測反演之電離層電子密度剖面資料,利用大氣潮汐分解方法,分析在2008-2010年平流層瞬間暖化事件期間,低緯度電離層電子密度各潮汐項的變化。結果指出在平流層瞬間暖化期間,最大電子密度的緯向時間平均和太陽同步遷移潮汐(DW1、SW2和TW3)振幅有減小的現象,以及伴隨著峰值出現時間的提早(1.5 - 4個小時)。而典型的半天變化之SSW電離層效應顯示,白天電離層赤道異常(Equatorial Ionization Anomaly, EIA)提早出現,下午EIA提前消失,發現此典型的效應可以藉由重建SSW事件前後,最大電子密度太陽同步遷移潮汐變化的總差異獲得。因此推測SSW電離層效應,應是由太陽同步遷移潮汐的變化所主導。然而先前研究認為行星波與潮汐的非線性交互作用,增強了非太陽同步遷移潮汐SW1只是次要的效應。
英文摘要 In this thesis, modifications of the ionospheric tidal signatures during the 2008-2010 stratospheric sudden warming (SSW) events are studied by applying atmospheric tidal analysis to ionospheric electron densities observed using radio occultation soundings of FORMOSAT-3/COSMIC. The tidal analysis indicates that the zonal mean and major migrating tidal components (DW1, SW2 and TW3) decrease around the time of the SSW, with 1.5-4 hour time shifts in the daily time of maximum. The typical ionospheric SSW signature: a semi-diurnal variation of the ionospheric electron density, featuring an earlier commencement and subsidence of EIA, can be reproduced by differencing the migrating tides before and during the SSW period. Our results also indicate that the migrating tides represent ~80% of the ionospheric tidal components at specific longitudes, suggesting that modifications of the migrating tides may be the major driver for producing ionospheric changes observed during SSW events, accounting for greater variability than the nonmigrating tides that have been the focus of previous studies.
論文目次 摘要 I
Abstract II
誌謝 III
目錄 V
圖目錄 VII
第 1 章 地球大氣層與電離層概述 1
1.1 大氣層之結構 1
1.2 電離層 5
1.2.1 分層結構與形成機制 5
1.2.2 電離層赤道異常 12
第 2 章 前言 17
2.1 低層大氣與電離層耦合 18
2.2 研究動機 28
2.3 論文內容概述 29
第 3 章 平流層瞬間暖化 30
3.1 增溫的動力機制 32
3.2 平流層瞬間暖化之電離層效應 37
第 4 章 觀測資料來源與處理 40
4.1 福爾摩沙衛星三號星系 40
4.2 資料前處理 42
4.2.1 平流層資料處理 42
4.2.2 電離層資料處理 43
4.3 結果與討論 46
4.3.1 平流層瞬間暖化發展 46
4.3.2 定義電離層SSW天與正常天 48
4.3.3 電離層電子密度垂直剖面變化探討 51
第 5 章 大氣潮汐分析與結果 55
5.1 大氣潮汐理論 55
5.2 潮汐分解方法 58
5.3 結果與討論 61
5.3.1 SSW事件期間電離層潮汐項振幅變化 61
5.3.2 太陽同步遷移潮汐相位變化 65
5.3.3 重建太陽同步遷移潮汐在LT上的變化 67
5.3.4 太陽同步與非同步遷移潮汐之重要性 70
5.3.5 2008、2010年SSW事件之比較 71
第 6 章 結論與未來展望 77
6.1 結論 77
6.2 未來展望 79
參考文獻 80
附錄 83
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