首次利用中壢特高頻雷達進行電離層F層不規則體觀測之研究; The First observation of Ionosphere F region irregularities by using the Chung-Li VHF Radar

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题名:	首次利用中壢特高頻雷達進行電離層F層不規則體觀測之研究;The First observation of Ionosphere F region irregularities by using the Chung-Li VHF Radar
作者:	羅世薇;Shih-wei Lo
贡献者:	太空科學研究所
关键词:	F層不規則體;中壢特高頻雷達;F region irregularities;the Chung-Li VHF radar
日期:	2008-06-11
上传时间:	2009-09-22 09:48:53 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	利用於2008年一月更新後的中壢特高頻雷達進行電離層F層不規則體之觀測，在2008年2月5日至2月6日夜間，中壢特高頻雷達首次完整觀測到電離層F層的回波。本文利用此次資料對電離層F層回波進行研究，期望由其觀測結果對F層不規則體的特性有更進一步的了解。利用IGRF2008年模型得到新雷達系統的預測回波區空間位置，藉由預測回波區的空間位置，可得知F層的回波來自空間中較遠的區域，而此將使雷達干涉方程所假設之整數常數Interferometer lobe number（Riggin,1984）估計較E層複雜許多，得到正確的相位差後才得以重建F層不規則體之三維結構。將重建後所得之不規則體高度與中壢電離層觀測台ionogram的資料互相比對，研究是否在最低高度上有相關，以驗證干涉法所得之三維結構結果。分析不規則體的三維結構大小，推知其不規則體整體型態為團狀型態不規則體。並利用干涉法的結果，對不規則體三維空間結構及其動力行為進行特性分析。在干涉法結合平均都卜勒速度資訊的關係圖上，發現隨著高度越高，平均都卜勒速度有越大的情形。並利用F層不規則體干涉法的結果計算其漂移速度。 The Chung-Li 52MHz VHF radar system had been rebuilt in January 2008. Immediately, during the nighttime of February 5 and 6, we observed the sporadic F（Fs） 3-meter field-aligned irregularities（FAIs） with the new Chung-Li VHF radar station. And this is the first time we get the completely echoes from the F region of ionosphere. In the thesis, we analyzed and investigated the radar spectra and reconstructed the 3-dimension spatial structures of the Fs FAIs by using the interferometry method. Expect to get more understanding about the characteristic of Fs FAIs from the results of this observation. A new expected echoing region of new Radar system was analyzed and modeled by using IGRF-2008 model. According to the result of the new expect echoing region, we can image the echoes of F region come from farer space than E region. And it makes estimating the Interferometer lobe number become more complex. After correcting the phase difference, we can construct the true 3-dimension spatial structures of Fs FAIs. Comparing the true height of the result from spatial structures and the virtual height of the ionogram from the Chungli Ionosphere Station, try to find the correlation between two of them. Analyzing and estimating the size of 3-dimension spatial structures of Fs FAIs fond that the irregularities may be blob type irregularities. On the plot of relation combining spatial structures and Doppler velocity, we fond the irregularities were higher, the Doppler velocity were larger. Estimate the drift velocity of Fs FAIs by using the interferometry 3-dimension spatial structures.
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