Geomagnetic field intensity variation deduced from oceanic crust

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To clarify the variation of the geomagnetic field intensity is important in order to elucidate the effect of shielding against cosmic rays and solar wind by the geomagnetic field. Past geomagnetic field intensities were determined using the oceanic crust that was erupted continuously over the past 100 million years and has recorded the geomagnetic field at the time of cooling. We found that geomagnetic field intensities are reliably retrieved from rapidly-quenched glassy and cryptocrystalline part of pillow lavas at the top of the oceanic crust. In addition, we were able to establish a protocol for screening subaerial lavas based on various magnetic measurements.