This could point to a dampening of the geomagnetic field intensity reconstruction in CALS10K.1 b but it could as well be due to undetected climatic influences on the 10Be flux. (swsc-journal.org)
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)
Tarduno and his team found a sharp 30 percent drop in magnetic field intensity from 1225 to 1550 AD. (sciencedaily.com)