Resolution No.12 (1967): Publication of Kp index supplementary to the Kp index

The IAGA considering the proposal of the Working Group on Magnetic Indices of Commission IV, concerning the elimination of solar flare effects in the computation of the Kp index, endorses the principle according to which, beginning 1 January 1968, an index Kp' should be derived from K' indices and published supplementary to the Kp index.