An empirical model of ionospheric total electron content (TEC) near the crest of the equatorial ionization anomaly (EIA) | Journal of Space Weather and Space Climate

Scientific Challenges in Thermosphere-Ionosphere Forecasting

Open Access

Fig. 3.

Seasonal variation of monthly mean TEC (TECU) normalized at F_10.7 = 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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