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

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Title:	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
Authors:	張耀文;Yao-weng Chang
Contributors:	太空科學研究所
Keywords:	日蝕;電離層探測儀;雷達;散塊E層;sporadic E;solar eclipse
Date:	2010-07-13
Issue Date:	2010-12-09 10:50:21 (UTC+8)
Publisher:	國立中央大學
Abstract:	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。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.
Appears in Collections:	[Graduate Institute of Space Science] Department of Earth Sciences

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