2) The paper I referenced states that the proxy magnetic field intensity derived from sea floor sediment data does not match obital frequencies however other papers state that it does. (realclimate.org)
«The data of the model simulation was so close to the deep ocean sediment data, that we knew immediately, we were on the right track,» said co-author Dr Laurie Menviel from the University of New South Wales, Australia, who conducted the model simulation. (sciencedaily.com)
The global field reconstructions of the CALSxk series (Continuous models based on Archeomagnetic and Lake Sediment data spanning the past x kyrs) are regularised spherical harmonic models. (swsc-journal.org)