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Seasonal variation of monthly mean TEC (TECU) normalized at F10.7 = 100 SFU during the ascending phase of the SC 22 (1986–1990) at three local times 1000, 1200, and 0000 LT. The filled circles connected by lines show the actual data while the continuous thick curve presents a sinusoidal curve with positive residual fitted to the data. The correlation coefficient (r) is shown in the figure.
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