Fig. 9

Year-to-year \(T_{yy}\) changes between KAK and MMB at a frequency of 9/30,720 Hz. a\(T_{xx}\) for KAK/MMB. The circles were derived from the raw geomagnetic data and correspond to the light-blue dots in Fig. 7c. The diamonds, squares, and triangles in 2004 are derived from the reconstructed data using only Basis vector 1, Basis vector 2, and Basis vectors 1 and 2, respectively. b\(T_{xx}\) for MMB/KAK. The circles were derived from raw geomagnetic data, and correspond to the light-blue dots in Fig. 7d. Note that the directions of the vertical axes in a and b are reversed