The Use of Paleomagnetic Data to Provide Constraints on Dynamo Models and the Evolution of the Earth's Core

PI将更新和分析过去500万年的古地磁数据，以对极性不对称问题进行强有力的统计分析，并确定古分子变化的纬度变化的来源。初步分析表明，平均场ATA(只有平均场数据)存在一些明显的极性不对称。这种不对称性是由于地震D“区的热电效应造成的，这一可能性将被研究。用类似于古地磁学家在熔岩流古分子变化研究中使用的程序对现今磁场的分析表明，一种方法首次可以通过分析古地磁数据来区分发电机理论的偶极子和四极子族。将使用更新的数据集对年龄小于500万年的岩石进行详细分析。如果在这段时间内成功，这些方法将被应用于追溯到白垩纪的更新数据。

The PI will update and analyze paleomagnetic data for the last five million years to carry out robust statistical analyses on the polarity asymmetry problem and to determine the origin of the latitudinal variation of paleosecular variation. Preliminary analyses indicate that there is some discernible polarity asymmetry for the mean field ata (and only mean field data). The possibility that this asymmetry is due to thermal electric effects in the seismic D" region will be examined. Analyses of the present field using procedures analogous to those used by paleomagnetists in paleosecular variation studies of lava flows indicate a method by which for the first time the dipole and quadrupole families of dynamo theory can be distinquished by analyzing paleomagnetic data. Detailed analyses will be carried out using an updated data set for rocks with ages less than five million years. If successful for this period of time, the methods will be applied to updated data going back in time to the Cretaceous.