博碩士論文 87227007 詳細資訊




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姓名 徐靖程(Jing-Cheng Hsu)  查詢紙本館藏   畢業系所 太空科學研究所
論文名稱 對全球QP回波觀測結果之整理與分析
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摘要(中) 而在赤道地區的不規則體的回波都為連續性回波(continuous radar echoes)這種回波不論是白天或晚上都有出現,且其不規則體的型態為型態1(type I)以及型態2(type II)兩種。早期在中緯度地區,由於雷達技術較不為發達,雖然有觀測到不同於連續性回波的雷達回波(即所謂的準週期性雷達回波,quasi-periodic radar echoes),亦在RTI(range-time-intensity plot)圖上發現到這種回波有一2~15分鐘的出現週期,但是當時所用來觀測的雷達,其空間解析度均只有3~15公里。一直到日本的MU雷達的加入以後(空間解析度為600公尺),才可以開始對種種的雷達回波做更進一步的研究。Yamamoto et al.,(1991)便是首位利用MU達觀測到準週期性回波的學者。這一類的回波在RTI圖上是間歇性的出現,而非連續性。而本論文之研究主要則是在於利用中壢VHf雷達對電離層散塊E層觀測實在RTI圖上所出現的準週期性回波做一進一步的分析與研究,並將在中壢所觀測道的準週期性回波與其他雷達所觀測到的準週期性回波做一比較與整理。
摘要(英) The main purpose of this thesis is to do the research about the quasi-periodic radar echoes detected by Chung-Li VHF radar and Gadanki MST radar from radial Doppler velocity, range rate, periodicity, and spectral width. The results show that the periodicity decreases with increasing range rate and the direction of the radial Doppler velocity in the upper and the lower region of some QP striations detected by Gadanki
MST radar are opposite. Besides these two characteristics, we also find that the spread of Doppler velocities increases as the altitude coverage of the echoes increases. These three characteristics are shown to be consistent with the variations to be expected if the shears in the neutral wind and the variations in the background mean flow are the dominant
mechanisms controlling the initiation of the echo structures. Moreover, there are seven radar stations detect the phenomenon of QP echoes from 1991 to 1999,so we also compare the observation results between these seven different radars located in different latitude .
關鍵字(中) ★ QP回波 關鍵字(英) ★ QP
論文目次 第一章 緒論………………………………………………………….1
§ 第一節 電離層之定義以及其形成原因………………1
§ 第二節 Es層(sporadic E)的介………………………4
§ 第三節 形成 層的機制………………………………6
§ 第四節 研究動機與內容………………………………8
第二章 中壢特高頻雷達觀測電離層之設備以及參數簡介紹……12
§ 第一節 天線系統……………………………………..12
§ 第二節 電離層觀測參數及訊號處理流程…………..16
第三章 觀測理論……………………………………………………17
§ 第一節 場沿不規則體(field-aligned irregularities)的形態介紹…………………………………..17
§ 第二節 產生小尺度不規則體的非線性理論………..21
§ 第三節 準週期性回波的理論………………………..22
§ 第四節 準週期性回波的特性………………………..31
第四章 觀測資料的分析……………………………………………33
§ 第一節 中性風對準週期性回波的貢獻……………..33
§ 第二節 中壢VHF雷達觀測之準週期性回波………44
§ 第三節 印度MST雷達觀測之準週期性回波………51
§ 第四節 對目前全球出現之準週期性回波作一整理與比較…………………………………………59
第五章 結論…………………………………………………………72
第六章 參考文獻
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王建亞,利用中壢VHF雷達進行電離層散塊E層不規則體之觀測,博士論文,國立中央大學太空科學研究所,1999。
朱延祥,MST雷達回波機制的研究,博士論文,國立中央大學大氣物理研究所,1988。
指導教授 潘貞杰(Chen-Jeih Pan) 審核日期 2000-7-5
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