A study on the ionospheric parameter f02 instantaneous mapping based on equivalent sunspot number

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 (R_eff) 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 minimum, the root mean square error is 1.06 MHz, and the relative error is 19.02%. On average, the globally root mean square error is 1.2 MHz, and the globally relative error is 17.07%. The evaluate method of `relative comparison method´ is put forward, and by comparing with the algorithm without using R_eff, the root mean square error is reduced by 0.75%,and the relative error is decreased by 1.05%.