系統識別號 U0026-1202201915314300
論文名稱(中文) 台灣地面高空短暫發光現象觀測網路記錄之紅色精靈與對應閃電之特性
論文名稱(英文) The Characteristics of the Sprites and Their Parent Lightning Captured by Taiwan TLE Observation Network
校院名稱 成功大學
系所名稱(中) 物理學系
系所名稱(英) Department of Physics
學年度 107
學期 1
出版年 108
研究生(中文) 郭政昕
研究生(英文) Cheng-Hsi Kuo
電子信箱 insectalien4220@gmail.com
學號 L26051184
學位類別 碩士
語文別 中文
論文頁數 69頁
口試委員 指導教授-許瑞榮
中文關鍵字 高空短暫發光現象  紅色精靈  地面觀測  極低頻磁場 
英文關鍵字 Lightning  Transient Luminous Events (TLEs)  sprite  optical TLE ground campaigns  Extremely Low Frequency (ELF) 
中文摘要 在早期的研究統計中,發現超過99.9%的紅色精靈是由正極性雲對地閃電所觸發,由於先前的研究主要為地面觀測,觀測範圍有所限制。因此在福衛二號衛星發射升空後,首次獲得了全球性的紅色精靈極性統計與分佈圖。並發現了20%以上的負極性紅色精靈事件,且負極性事件集中於緯度20度以內,這樣的結果與先前的結果有所差異,推測為之前的地面觀測站緯度偏高導致觀測到負極性事件較為稀少。成大目前運行中的地面光學觀測網路為目前極少數位於低緯度地區的觀測系統。因此本論文將使用台灣附近地面觀測資料,搭配安裝於鹿林天文台的極低頻磁場天線系統,對台灣附近的紅色精靈事件進行分析,希望能對於低緯度區域的紅色精靈極性有更進一步的瞭解。
英文摘要 Williams et al. (2007) summazied that more than 99.9% sprites are initiated by positive cloud-to-ground (+CG) and high charge moment change (CMC). After the launch of Formosat-2, the Imager of Sprite Upper Atmosphere Lightning (ISUAL) obtained the sprite globally for the first time and had a chance to investigate their polarities. The result surprisingly indicated that more than 20% of sprite events were triggered by negative cloud-to-ground lightning, totally different from the previous statistic results. Furthermore, most of negative sprites distribute over low latitude, and more than 80% negative sprites appear with halo signatures. The Taiwan optical TLE ground network, which consists of four stations is the only low-latitude observation facility in the world, and is capable to validate the above conclusions and explore the polarity of sprite around Taiwan with the assistance of the Lulin ELF obversations.
In this study, 813 sprite events captured by Taiwan optical TLE ground network from 2015 to 2016 are carefully analyzed. 15 negative sprites, approximately 1.85% of all events, were identified. Although the ratio of the negative sprite is less than the result obtained by ISUAL, this ratio is still significantly higher than the finding proposed by Williams et al. In the identified negative sprites, more than 27% events appeared with halo signatures, and 8 events appear in groups and the morphology of them is columnar. The derived CMCs of the sprites demonstrates that the CMC of negative sprites is averagely lower than the one of the positive sprites, and it is consistent with the finding by ISUAL observation. These results reveal some crucial characteristics and clues for the theoretical model of negative sprite.
論文目次 摘要I
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