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系統識別號 U0026-2107202010375300
論文名稱(中文) 2019年哈吉貝颱風觸發之移行電離層擾動
論文名稱(英文) Traveling Ionospheric Disturbances Triggered by Typhoon Hagibis in 2019
校院名稱 成功大學
系所名稱(中) 地球科學系
系所名稱(英) Department of Earth Sciences
學年度 108
學期 2
出版年 109
研究生(中文) 鄭又禎
研究生(英文) Yu-Chen Cheng
學號 L46071120
學位類別 碩士
語文別 中文
論文頁數 55頁
口試委員 指導教授-林建宏
口試委員-陳佳宏
口試委員-孫楊軼
口試委員-林其彥
中文關鍵字 電離層  MSTID  重力波  颱風 
英文關鍵字 ionosphere  MSTID  gravity wave  typhoon 
學科別分類
中文摘要 劇烈對流層天氣可以驅動同心圓大氣重力波並擾動電離層電子濃度,此種重力波擾動能產生同心圓狀的波紋向上傳播至電離層。藉由分析大量雙頻全球衛星定位系統接收站資料,可以了解在電離層中帶電粒子的電漿密度變化。在2019年10月11日,日本北海道觀測到強烈颱風哈吉貝產生之擾動波,與前人研究颱風造成中尺度移行電離層擾動(Medium Scale Traveling Ionospheric Disturbance,MSTID)類型相符。然而在此次事件中,我們也發現到除了在颱風西側存在理論預測的電離層擾動,理論預期較不產生擾動的北側也存在明顯電離層擾動,其相對位置、季節、波動週期以及波長皆與以往觀測到的颱風事件波動截然不同。本研究藉由帶通濾波器(Bandpass Filter)分析電離層重力波擾動的週期、波長、水平相速度等性質,以及重力波追蹤方程式(Equations of CGWs Ray Tracing),發現重力波垂直傳遞到電離層層峰高度所需的時間和半徑隨著高度逐漸增加,其特性符合重力波線性理論。此外,以往10月份在北海道地區不易產生MSTID的波動,但藉由此次颱風事件可清楚觀察到颱風引起的MSTID由北海道北邊往西南方向傳播。在較少存在MSTID的季節,劇烈天氣現象驅動的強對流系統對電離層的影響較為明顯,並在颱風北側產生MSTID等電離層擾動現象,本研究有助於更加了解天氣變化對太空天氣造成的影響。
英文摘要 On October 11, 2019, Typhoon Hagibis arrived and made landfall over Japan and triggered a series of traveling ionospheric disturbances. By analyzing receiving signals from Global Position System (GPS) using a dense ground based network in Japan, we calculated the total electron content (TEC) and its perturbations to observe the corresponding ionosphere disturbances triggered by this severe weather event. The event triggered the concentric gravity wave (CGW) and affected the ionosphere by generating concentric traveling ionospheric disturbances (CTIDs) with wave characteristics of 10-25 min period and 500 km radius at 250 km altitude traveling for 118 minutes. The characteristics of the CTIDs corresponded with the linear gravity wave theory and had the most likely source in the convective clouds after performing ray tracing analysis. Additionally, there was a series of medium scale traveling disturbance (MSTID) occurred over Hokkaido following CTIDs. As MSTID is rarely occurred in October at latitude around Hokkaido the event is of interest to for studying the coupling processes between CTIDs and MSTIDs. We have checked the existing of Es layer over the region as Es layer instability is one of the important drivers of MSTID formation. We find that the MSTIDs over Hokkaido area were not associated with Es layer after comparing the occurrence of MSTIDs and foEs from ionosondes. These results suggest that the occurrence of MSTIDs over Hokkaido area during the typhoon Hagibis invasion was driven by the CGWs and the relative locations of the MSTIDs and CGWs are unexpected according to the theoretical prediction. We also have examined other events over the same region and found that most of them were triggered by the tropospheric convective events.
論文目次 第1章 緒論 1
1.1 電離層簡介 1
1.2 中尺度移行電離層擾動 3
1.3 文獻回顧 8
1.4 研究動機 12
第2章 觀測儀器 13
2.1 GPS觀測原理 13
2.2 電離層探測儀 17
第3章 資料處理與分析 19
3.1 NRLMSISE-00 Atmosphere Model 19
3.2 濾波器 21
第4章 資料分析與結果 23
4.1 GPS觀測颱風事件觀察結果 23
4.2 MSTID與Es統計分析 34
4.2.1 MSTID統計結果 34
4.2.2 Es統計結果 37
4.3 非颱風事件之MSTID觀察結果 44
第5章 結論 51
參考資料 53
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周育霆,「低緯度地區中尺度電離層移行擾動研究」,國立成功大學,碩士論文,2017。
陳柏成,「火山噴發對電離層擾動之研究」,國立成功大學,碩士論文,2014。
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