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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/5124


    Title: 電離層散塊E層型態二不規則體之研究;Type-II irregularities of ionospheric sporadic E( )layer
    Authors: 楊國峰;Kuo-Feng Yang
    Contributors: 太空科學研究所
    Keywords: 電離層;sporadic E irregularities
    Date: 2002-06-10
    Issue Date: 2009-09-22 09:45:31 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 中緯度地區電離層散塊E層的不規則體主要是由梯度漂移不穩定的物理機制所引起。本文是利用位於中緯度地區的中壢特高頻雷達,對電離層散塊E層型態二不規則體回波做分析與研究,並以1997年8月7日,使用52MHz發射頻率觀測尺度為3公尺左右不規則體的回波事件,來討論中壢上空電離層散塊E層不規則體漂移的情形以及回波的一些特性。中壢電離層天線的設計是根據IGRF-85模型的推算結果,本文中利用國際地磁模型(IGRF-2000)對中壢雷達地理位置所對應之地磁場狀況進行推算,藉以了解自1980年至2002年,中壢雷達雷離層散塊E層回波區的變化。另外,本文中利用moment method所得到頻譜中的power、mean Doppler velocity以及頻寬,並結合干涉法重建此種回波之三度空間結構,我們可以經由這樣的方法,得到不規則體在三度空間中的細部變化,這在電離層資料分析上有很大的幫助。 The sporadic E irregularities associated with type-II radar spectra are mainly caused by gradient drift instability at mid-latitude ionospheric region. Type-II irregularities of ionospheric sporadic E( )layer are analyzed and investigated in this article by using the Chung-Li VHF radar. At the same time, use an echo case of August, 1997 to discuss that, the drift situation of sporadic E irregularities at above Chung-Li VHF radar. The variation of Chung-Li VHF radar ionospheric sporadic E( ) echo region are figured out in this article by using IGRF model-2000. Besides, combine the result of reconstructing the three-dimensional structure of the echoes by interferometry and the result of moment method. We can obtain the detail variation of sporadic E irregularities. The method is useful in data analysis of ionospheric.
    Appears in Collections:[太空科學研究所 ] 博碩士論文

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