摘要
Kudeki et al.[1999]利用位於磁赤道區的Jicamarca雷達站的觀測資料，提出在日落處的電離層F層的電漿飄移呈現一個電漿漩渦(Plasma vortex)的圖形，是一個順時鐘方向流動、中心高度約250公里、東西經度2000~3000公里範圍的垂直磁場的二維空間圖形。於是利用TIEGCM模式，模擬全球的資料，藉此研究電漿漩渦的成因。發現電漿漩渦的部分成因是與反轉前增強現象(Prereversal enhancement)有關，而另一部分影響電漿水平飄移的原因則是因為電離層的水平電場和中性風發電效應(wind dynamo effect)所造成，這一部分是研究的重點所在。而中性風變動因素很多，因此對會影響中性風的因素做進一步的研究，發現太陽活動週期、潮汐作用是影響中性風的重要因素。不同太陽活動性，電漿漩渦的位置及形成情形都不同。而在太陽活動極小期時，下層潮汐作用顯為重要，潮汐作用會影響水平電場及中性風，進而影響電漿漩渦的形成。

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