Authigenic Be/Be ratio signatures of the cosmogenic nuclide production linked to geomagnetic dipole moment variation since the Brunhes/Matuyama boundary.

Geomagnetic dipole moment variations associated with polarity reversals and excursions are expressed by large changes of the cosmogenic nuclide beryllium-10 (Be) production rates. Authigenic Be/Be ratios (proxy of atmospheric Be production) from oceanic cores therefore complete the classical information derived from relative paleointensity (RPI) records. This study presents new authigenic Be/Be ratio results obtained from cores MD05-2920 and MD05-2930 collected in the west equatorial Pacific Ocean.