運用臺灣自主電離層數值模式研究電離層赤道異常現象

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姓名

黃俊穎(Jyun-Ying Huang) 查詢紙本館藏

畢業系所

太空科學研究所

論文名稱

運用臺灣自主電離層數值模式研究電離層赤道異常現象
(A modeling study of the ionospheric equatorial anomaly based on the FormoSat-3/COSMIC data)

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摘要(中)

運用COSMIC全球分佈的RO觀測的電漿濃度（Ne）垂直剖面資料所製作出的臺灣自主電離層數值模式(TaiWan Ionospheric Model,TWIM)，此電離層模式為純粹以實際觀測資料所建構的經驗模式，可提供2007年至今全球電離層各層的峰值濃度（fc）、峰值高度（hm）與其標尺高（H）。利用此模式我們分別對於赤道異常現象各特徵與變化進行研究與討論。其中包含了驗證赤道異常現象在日、季、年等不同時間尺度上的變化與其特徵，並討論東向電場與赤道異常現象的關係、電離層冬季異常現象、太陽活動力對電離層濃度的影響和赤道異常現象的發展與噴泉效應關係。

摘要(英)

The TaiWan Ionospheric Model (TWIM) is a numerical and phenomenological model of global ionospheric electron density (Ne) and is constructed from monthly-weighted and hourly vertical Ne profiles retrieved from FormoSat3/COSMIC GPS radio occultation measurements. TWIM can also provide global F2-layer critical frequency (foF2), peak density height (hmF2), and scale height (HF2) maps to study features of equatorial ionospheric anomaly (EIA). The modeling study investigates the diurnal and seasonal variations of EIA and specifically attempts to account for the latitudinal and longitudinal structures. This paper also shows that the neutral winds could cause the north-south asymmetries and longitudinal variation. Furthermore, the phenomena of EIA were also varied with the solar activity. The foF2 values in 2007 are higher than those in 2008 generally, with the exception in March. This variation and exception match to the different of the observational sunspot number between 2007 and 2008.

關鍵字(中)

★ 赤道異常
★ 福衛3號
★ 數值模式
★ 電離層

關鍵字(英)

★ COSMIC
★ Ionospheric Model
★ EIA

論文目次

中文摘要……Ⅰ
英文摘要……Ⅱ
誌謝……………Ⅲ
目錄……………IV
圖錄……………Ⅴ
第一章序論.1
1.1研究動機.1
1.2電離層簡介.2
1.3電離層赤道異常現象.6
1.4電離層赤道異常現象成因.9
第二章臺灣自主電離層數值模式.11
2.1臺灣自主電離層數值模式（TWIM）.11
2.2 FormoSat-3/ COSMIC.11
2.3掩星觀測法.15
2.4 TWIM的建製.21
2.5 TWIM所提供結果.24
2.6 TWIM之可信度.30
第三章 TWIM模式觀測結果.34
3.1資料處理.34
3.2日變化.37
3.3季節變化.39
3.3.1季節異常現象.43
3.4年變化.45
3.5赤道異常現象峰值變化.48
第四章結果與討論.50
4.1 E × B飄移與東向電場影響.50
4.2冬季異常.53
4.3中性風效應.55
4.4太陽活動力效應.60
4.5噴泉效應.63
第五章結論與未來展望.65
參考文獻.67

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指導教授

蔡龍治(Lung-Chih Tsai)

審核日期

2009-7-9

推文