Abstract：We introduce in this paper a regularization-integral iteration method in wavenumber domain for downward continuation of potential fields.In order to quicken the convergence,suppress the noise spectral and stabilize continuation,the iteration method uses regularization downward continuation result as an initial value,and regularization operator to deal with the residual spectral produced in iteration processing.We deduce the optimal step-length of the iteration,analyze convergence and filter characteristics,and propose L-curve as a tool for choosing regularization parameter to quicken calculation and adapt for wavenumber domain iteration.Tests on model data and real geomagnetic data shows that the downward continuation precision,reliability and convergence of the proposed method are improved,and its continuation is better than that of other methods such as generalized inverse,iteration integral,Taylor series iteration and Landweber iteration.
