| 研究生: |
王泳茗 Wang, Yung-Ming |
|---|---|
| 論文名稱: |
2023年SpaceX火箭爆炸引發電離層電漿擾動研究 Ionospheric Plasma Disturbances Triggered by SpaceX Rockets Explosion in 2023 |
| 指導教授: |
陳佳宏
Chen, Chia-Hung |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 地球科學系 Department of Earth Sciences |
| 論文出版年: | 2024 |
| 畢業學年度: | 112 |
| 語文別: | 中文 |
| 論文頁數: | 74 |
| 中文關鍵詞: | 福衛七號 、小波分析 、帶通濾波器 、SpaceX 、GNSSTEC |
| 外文關鍵詞: | SpaceX, GNSSTEC, FORMOSAT-7/COSMIC-2, Wavelet analysis, Band-pass filter |
| 相關次數: | 點閱:42 下載:0 |
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電離層擾動會對衛星與地面之間的通訊產生影響,造成電離層電漿擾動的原因大致上可分為自然活動與人為作用。從前人研究中,對流層的大規模天氣現象,抑或是大規模地震或火山噴發,都有機會對電離層產生擾動。而人為活動像是核子試爆與火箭發射,也有可能影響到電離層。近年來太空任務是許多國家的發展重點,而大部分的火箭軌跡會經過電離層,過往的研究中主要都是針對火箭的飛行軌跡和燃料與大氣中氣體產生化學反應對電離層電漿的擾動,還未有研究針對火箭爆炸波產生的擾動。
2023年SpaceX發射兩枚重型火箭,但皆以失敗收場。兩次發射時長分別為4分鐘和8分鐘,飛行高度約為30公里和150公里,並在空中爆炸損毀。本研究主要針對火箭在空中爆炸所導致的波動是否對電離層產生擾動,並且研究擾動波特性。研究所使用的數據來自於美國地面GNSS測站接收GPS/GLONASS衛星訊號,以及福爾摩沙衛星七號的掩星資料,分別觀察電離層電漿在爆炸前後水平與垂直的變化。美國地面GNSS測站訊號用於觀察火箭爆炸前後的電離層全電子含量TEC水平變化,利用小波分析(Wavelet analysis)與帶通濾波器(Band-pass filter)找出影響電離層電漿擾動的特定週期波段,並計算擾動波的傳遞波速。福爾摩沙衛星七號則是使用掩星資料中電漿垂直剖面濃度(ionPrf)與對流層大氣溫度垂直剖面(atmPrf),觀察爆炸前後是否有垂直方向的波動傳遞。
本研究針對兩次爆炸事件進行分析研究,首先是2023年11月18日的爆炸事件,接著是2023年4月20日的爆炸事件,因為兩者爆炸高度不同,因此藉由兩者的差異了解爆炸波對於電離層的影響,同時印證研究結果是否合理。本研究結果得知,爆炸後產生的能量波會產生特定週期的電離層擾動,並進一步利用大氣波動的物理特性,找出相對應的能量波種類。根據波動的分析結果可以分為三種不同週期,分別為10~20分鐘、5~10分鐘與2~4分鐘,接著根據波動頻散關係,利用波速、波長、頻率等波的物理特性,計算聲波與重力波範圍。結果顯示本研究所觀測到的三種不同週期擾動波皆屬於聲波擾動。福衛七號的結果則顯示在爆炸發生後,特定波長的訊號相較於參考天有明顯的差異。本研究的成果對於火箭爆炸造成電離層電漿擾動有更深入的了解。
In 2023, SpaceX launched two heavy rockets for testing, both of which ended in failure. The duration of the launches was 4 minutes and 8 minutes respectively, with flight altitudes of approximately 30 kilometers and 150 kilometers, resulting in mid-air explosions and destruction. This study primarily focuses on whether the disturbances caused by the explosions of the rockets affect the ionosphere as well as the characteristics of disturbance waves. The data used in this research comes from ground-based GNSS stations in the United States receiving GPS/GNSSTEC satellite, and the radio occultation data from the FORMOSAT-7/COSMIC-2 satellite, observing horizontal and vertical changes in the ionospheric plasma before and after the explosions.
The GNSS station data in the United States are used to observe the horizontal changes of the Total Electron Content (TEC). The data from FORMOSAT-7/COSMIC-2 satellite, including ionospheric electron density profiles (ionPrf) and atmosphere temperature profiles (atmPrf), are used to observe the vertical wave propagations. Wavelet analysis and band-pass filter are employed to identify specific periodic bands that affect ionospheric disturbances and to calculate the characteristics of wave propagation.
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校內:2026-12-31公開