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A CRI (Chinese Reference Ionosphere model) based kriging real time updating method for foF2 is presented in this paper. This method uses effective sunspot number (Reff) and selects the relative difference between the observed and the CRI model calculated values of foF2 as the variable. During solar maximum, the root mean square error is 1.32 MHz and the relative error is 14.86%. While during solar...
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