摘要
　　由於電子濃度的擾動會對訊號產生干擾。為了研究磁暴期間電離層電子濃度每天的變化，此篇研究以統計方法分析電離層電子濃度(TEC)在中緯度與低緯度的擾動，使用的資料是在2000~2009年之間東亞與美洲經度的GIM資料，由GPS地面接受站資料處理所得。
　　為了比較磁暴對電離層影響與電離層每天的日變化影響，使用了Z-test方法分別分析中磁暴與強磁暴，並把磁暴依照磁暴發生當地時間分成四類分開比較。
　　為了改善分析方法的誤差而發展出不同的分析流程。研究發現，美洲地區對磁暴的反應相較亞洲地區明顯。在白天發生的磁暴之後立即發生電子濃度異常增加的事件；而電子濃度異常減少的事件在磁暴發生之後的12小時內幾乎沒有，12小時之後才開始出現，約24小時左右是最大值，並且可以持續三天左右都還有零星的事件發生。

Abstract
This paper presents statistical study of the ionospheric total electron content (TEC) disturbances at mid- and low-latitude ionosphere during magnetic storms by using GPS receiver networks along East-Asia and America longitudes during ten-year period of 2000-2009.

To investigate the significance of the magnetic storm effect in comparison with the day-to-day ionospheric variability, we perform the z-test analysis for moderate, and intense magnetic storm events. The storm events are further categorized into four onset local time periods to study the local time effect. Meanwhile, the study performed in the two longitude sectors provides further information for longitudinal effect of the ionospheric storm effects.

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