磁暴引發之電離層垂直向擾動

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/60589

Title:	磁暴引發之電離層垂直向擾動
Authors:	徐稚婷;Hsu,Chih-ting
Contributors:	太空科學研究所
Keywords:	電離層;福爾摩沙衛星三號;磁暴;ionosphere;FORMOSAT-3/COSMIC;geomagnetic storm
Date:	2013-07-22
Issue Date:	2013-08-22 11:41:25 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文首次利用福爾摩沙衛星三號全球定位系統的掩星資料，分析探討2008到2011年間九個磁暴事件中，高度150到600公里間的電離層擾動現象。研究中使用全電子含量(TEC)和其梯度(dTEC)以及電子濃度等三種垂直剖線，並依高、中、低三個緯度區和子、晨、午、昏四個時段劃分，以小波分析計算波譜研究磁暴所引發之電離層擾動特徵與分布。結果發現，磁暴期間電離層300公里以上之15~30公里波長擾動會明顯增強，其強度以高緯度地區最為明顯。推測磁暴時，注入極區之能量和其伴生之電磁場是造成電離層擾動的重要原因。 This study for the first time reports wavy signatures in the vertical profile from 150 km to 600km observed by FORMOSAT-3/COSMIC (F-3/ COSMIC) during 9 pronounced magnetic storms in 2008 to 2011. Total electron content (TEC), gradient TEC (dTEC) and electron density are used in this study. The profiles in the quiet time and disturbed periods are subdivided into four sectors, noon, dusk, midnight, and dawn, to find wavy characteristics. Wavelet transformation is applied to examine profiles before and during the storm period. Above 300km, the ionosphere becomes very structured, and the amplitude of 15~30km-wavelength fluctuations significantly enhances during the storm period, especially high latitude region. The consistency between the change of geomagnetic index and disturbance of ionosphere suggest that the energy input from polar region, electric field, and magnetic field plays an important role.
Appears in Collections:	[Graduate Institute of Space Science] Department of Earth Sciences

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