本文主要針對赤道地區電離層F層電漿空腔(ESF)之小尺度擾動結構進行剖析與研究，利用華衛一號IPEI酬載沿著飛行軌道所提供的高解析度之電漿濃度與速度資料，配合新的時頻分析法”HHT”，可以在不需做線性化假設的情況下，直接將電離層離子速度與濃度梯度之一維空間資料利用EMD過程將之分解成若干個具有不同特徵尺度的基模(IMF)，之後再對各個基模施以HT進行時頻(空間波數)分析。 配合一套吾人由HHT衍生發展出來的尺度相關分析法，發現在電漿泡內部的結構中，擾動尺度約300m 以下的離子垂直速度擾動與濃度橫向梯度擾動彼此之間具有極相似的擾動波形，這意謂著波長尺度在300m 以下的電漿結構擾動中，能引發離子垂直運動的橫向擾動電場必須滿足波茲曼關係式。 另外，透過HHT波譜分析吾人發現，離子垂直速度波譜在50m附近出現明顯快速的轉折，並且與相對濃度梯度波譜有明顯差異。 配合理論進一步研究發現，300m至50m的區間，主要的機制為低頻漂移波；而50米以下的擾動則很可能是離子擴散機制產生雙極電場的效應所造成的。
本論文使用IPEI所提供的高解析資料，並引進新的分析技術HHT，成功有效的對赤道地區電離層F層之小尺度電漿結構進行空間域與波數域的剖析，一方面確認出低頻漂移波在300m至50m附近的尺度區間扮演主要機制，並指出50米以下的擾動則很可能是離子擴散機制產生雙極電場的效應所造成的；另一方面則發現離子垂直速度的HHT波譜在50m附近有”二次轉折”的現象存在，透過若干案例的分析與歸納發現此一新現象具有“相對濃度梯度越強，速度波譜發生轉折時所對應的波長越小； 而波譜轉折發生時所對應的能量水位亦較高”的特性。

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