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Student Number 966203008
Author Yang-Yi Sun(孫楊軼)
Author's Email Address No Public.
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Department Graduate Institute of Space Science
Year 2008
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Low latitude ionospheric irregularities observed by FORMOSAT-1 and GPS ground-based receivers during soloar maximum
Date of Defense 2009-06-03
Page Count 91
Keyword
  • Hilbert-Huang Transform
  • Low latitude Ionospheric irregularities
  • Abstract A ground-based receiver of the global positioning system (GPS) can easily probe the ionosphere, except desert and oceanic areas, with a high temporal resolution. By contrast, a satellite orbiting observes large area (for example, FORMOSAT-1 covers the ionosphere within +/- 35°) and, however its revisit time generally is rather long. In this study, seasonal and geographical variations as well as geomagnetic storm signatures in ionospheric irregularities within +/- 35° are examined by employing worldwide ground-based GPS receivers and FORMOSAT-1 during the solar maximum period of 1999/1/27-2004/6/17. The Hilber-Huang transform is first applied to compute the instantaneous total power of waves with period less than 25 minutes of the ion density recorded by FORMOSAT-1 and to remove middle and large scale travel ionospheric disturbances (MSTID) in the ionospheric total electron content derived from the ground-based GPS receivers. Results show that the spatial distributions of the FORMOSAT-1 total power generally agree with those of the GPS TEC phase fluctuation in various seasons. Moreover, a long-tern observation in the GPS TEC phase fluctuation indicates that magnetic storms can either trigger or suppress low latitude ionospheric irregularities.
    Table of Content 摘要 ....... ............................................i
    Abstract ............................................... ii
    致謝 .................................................. iii
    目錄 ................................................... iv
    圖目錄 .................................................. v
    表目錄 ................................................. vi
    第一章 緒論 ............................................. 1
    1.1低緯電離層不規則體與磁暴 ............................. 1
    1.2研究動機 ............................................ 12
    1.3內容概述 ............................................ 12
    第二章 觀測儀器與方法 .................................. 13
    2.1電離層電漿電動儀 .................................... 13
    2.2 全球定位系統 ....................................... 17
    2.3 自動化雜訊輔助篩濾趨勢 ............................. 22
    第三章 觀測結果 ........................................ 31
    3.1不規則體之日變化、季變化與經度變化 .................. 32
    3.2磁暴對不規則體的催生與抑制 .......................... 36
    第四章 討論與結論 ...................................... 41
    4.1低緯電離層不規則體 .................................. 41
    4.2希爾伯黃轉換 ........................................ 47
    4.3 結論 ............................................... 48
    附錄A 希爾伯黃轉換 ..................................... 50
    附錄B 磁暴案例 ......................................... 62
    參考文獻 ............................................... 86
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    Advisor
  • Jann-Yenq Liu(劉正彥)
  • Files
  • 966203008.pdf
  • approve in 2 years
    Date of Submission 2009-07-19

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