论文标题
主要地磁领域的北极部分和核心壳边界的大规模地形异质性
The Nondipole Part of the Main Geomagnetic Field and the Large Scale Topographical Heterogeneities of the Core-Mantle Boundary
论文作者
论文摘要
基于卫星数据，在核心表面上都鉴定出大型和小规模的流量。在同一时间，观察到的主要地磁场的偶极子分量的快速减少并没有找到令人满意的解释。在先前的论文中，我们对最低地幔结构进行了比较研究，其小尺寸电流环的运动路径近似于MGF的小规模异常。该假设指出，与古代俯冲区相关的最低地幔结构的异质性和与古代俯冲区相关的核心隐界的地形不规则是主要负责小规模涡流形成和局部MGF变化的构成。在本文中，我们对近似地磁场的北极部分部分的大规模来源进行了类似的比较。
Based on satellite data, both large and small-scale flows were identified on the core surface .At the same time, the observed rapid decrease in the dipole component of the main geomagnetic field does not find a satisfactory explanation. In the previous papers we carried out the comparative studies of the structure of the lowest mantle with the motion path of the small size current loops approximating the MGF's small-scale anomalies. The hypothesis was stated that heterogeneities in the lowest mantle structure and the topographic irregularities of the core-mantle boundary associated with ancient subduction zones is one of the primarily responsible for the small-scale vortices formation and the local MGF variation. In this paper, we carry out the analogous comparison for the large scale sources approximating the nondipole part of the geomagnetic field.
