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

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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:	[Graduate Institute of Space Science] Department of Earth Sciences

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