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Fig. 3.


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Global Daily Mean Total Electron Content (GDM-TEC) versus the daily solar indices during the 23rd solar cycle. The figures show the typical data sets generally used to estimate the linear correlation coefficient between GDM-TEC and (a) daily Sunspot Number, (b) daily F10.7 and (c) F10.7P. Also given is the linear correlation coefficients R between the GMD-TEC and solar indices.

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