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姓名 張耀文(Yao-weng Chang) 查詢紙本館藏 畢業系所 太空科學研究所 論文名稱 日蝕前後電離層散塊E層變化之研究
(the variation of sporadic E in the ionosphere during the solar eclipse)相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 2009年7月22日為最近一次發生日蝕的時間,而中壢地區剛好位於日偏蝕的路徑上,本文即利用中壢52MHz特高頻雷達觀測2009年7月20日至7月24日日蝕前後電離層散塊E層不規則體,並利用雷達干涉法定位分析不規則體的平均都卜勒速度、頻譜寬以及總功率。分析結果顯示五天的平均都卜勒速度均有類似波動的現象;而日蝕期間的平均頻譜寬以及總功率也比其他天同時段來的大。同時本文也利用中壢電離層觀測站所得到的電離圖來進行分析,由於日蝕當天中午過後有磁暴發生,在電離圖中可發現foF2與foEs也跟著受影響,在此亦對此現象作推論。最後本文同時比較中壢特高頻雷達與電離層探測儀的資料,包括比較回波頻譜寬與Es層厚度、回波訊噪比與foEs並針對其中的特性去做定性以及定量的討論。
摘要(英) On July 22 2009, the total solar eclipse was occured, which partially covered about 80% Chung-Li VHF radar. We used the Chung-Li 52MHz VHF radar to observe the 3-m field aligned irregularities(FAI) of sporadic E from July 20 to July 24, 2009 to study the solar eclipse effect on the FAIs. Interferometry technique was used to locate the positions of the FAIs and analyze the mean Doppler velocity, spectral width, and total power of radar returns from the irregularities. The results showed that there are some fluctuations about the mean Doppler velocity during five days. It also showed that the spectral width and total power in the eclipse time are much larger than those in the same time of other days. On the other hand, in this research we also analyze the ionograms recorded by the Chung—Li ionosonde station. Due to the effect of strong magnetic storm occurred in the afternoon on eclipse day, we found that the behavior of the foEs and foF2 are severe perturbed and will discuss and interpret this phenomenon in this thesis. We also compare the parameters data of Chung-Li VHF radar data and ionosonde, including spectral width, the thickness of Es, SNR and foEs, and discuss there differences quantitively and qualitatively.
關鍵字(中) ★ 日蝕
★ 電離層探測儀
★ 雷達
★ 散塊E層關鍵字(英) ★ sporadic E
★ solar eclipse論文目次 摘要...........................................................i
Abstract......................................................ii
致謝..........................................................iv
目錄..........................................................vi
圖目錄........................................................ix
表目錄.......................................................xiv
第一章 前言.....................................................1
1.1研究內容..................................................1
1.2觀測儀器簡介..............................................3
1.2.1中壢VHF特高頻雷達簡介................................3
1.2.2電離層探測儀簡介......................................9
第二章 理論基礎................................................13
2.1日蝕形成原因.............................................13
2.2磁暴.....................................................18
2.3散塊E層不規則體形成機制.................................19
2.3.1雙流不穩定機制.......................................21
2.3.2梯度漂移不穩定機制...................................24
2.3.3兩步驟回波理論.......................................26
2.4雷達干涉法...............................................28
2.4.1雷達干涉法理論.......................................28
2.4.2 52MHz雷達陣列方程式.................................30
第三章 利用IGRF模型分析與模擬中壢地區電離層回波區.............36
3.1 IGRF模型簡介...........................................36
3.2預測回波區特性與計算....................................37
3.3雷達系統初始相位校正....................................40
第四章 資料取得與處理.........................................48
4.1雷達參數設定.............................................48
4.2回波訊號處理.............................................49
4.2.1頻譜圖...............................................52
4.2.2動差法分析頻譜圖特性.................................53
4.2.3距離─時間─功率強度等值圖...........................55
4.2.4互相關頻譜、相位差頻譜、相關係數頻譜.................60
4.3不規則體的三維空間結構...................................62
4.4處理Barker code造成影響的訊號...........................63
第五章 觀測結果與討論.........................................71
5.1 平均都卜勒速度、頻譜寬、總功率、隨時間變化情形...........71
5.2 電離圖foEs、fbEs、foF2、Es厚度隨時間的變化.............78
5.3 中壢特高頻雷達與電離層探測儀的比較......................84
5.3.1 平均頻譜寬與Es厚度的比較...........................84
5.3.2 訊噪比與foEs的比較.................................90
第六章 結論與未來展望.........................................96
6.1結論.....................................................96
6.2未來展望.................................................98
參考文獻......................................................99
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蕭俊傑, 電離層波動垂直能量傳播之研究, 國立中央大學太空科學研究所, 博士論文, 2003
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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, 國立中央大學太空科學研究所, 博士論文, 1999
指導教授 朱延祥(Yen-Hsyang Chu) 審核日期 2010-7-13 推文 plurk
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