The parameterization of the magnetospheric field contribution, generated by currents flowing in the magnetosphere is of major importance for the analysis of Mercury’s internal magnetic field. Using a combination of the Gauss and the Mie representation (toroidal–poloidal decomposition) for the parameterization of the magnetic field enables the analysis of magnetic field data measured in current carrying regions in the vicinity of Mercury. In view of the BepiColombo mission, the magnetic field resulting from the plasma interaction of Mercury with the solar wind is simulated with a hybrid simulation code and the internal Gauss coefficients for the dipole, quadrupole and octupole field are reconstructed from the data, evaluated along the prospective trajectories of the Mercury Planetary Orbiter (MPO) using Capon’s method. Especially, it turns out that a high-precision determination of Mercury’s octupole field is expectable from the future analysis of the magnetic field data measured by the magnetometer on board MPO. Furthermore, magnetic field data of the MESSENGER mission are analyzed and the reconstructed internal Gauss coefficients are in reasonable agreement with the results from more conventional methods such as the least-square fit.

由磁层中流动的电流产生的磁层磁场贡献的参数化对于分析水星内部磁场至关重要。使用高斯和Mie表示的组合（环-极分解）对磁场进行参数化，可以分析在水星附近载流区域中测得的磁场数据。鉴于BepiColombo任务，使用混合模拟代码模拟了水星与太阳风的等离子体相互作用产生的磁场，并根据数据重建了偶极子，四极子和八极子场的内部高斯系数，并沿使用Capon方法的水星行星轨道器（MPO）的预期轨迹。尤其，结果表明，通过对MPO板上磁力计测量的磁场数据的未来分析，可以高精度确定水星的八极场。此外，分析了MESSENGER任务的磁场数据，并且重建的内部高斯系数与更常规方法（如最小二乘拟合）的结果合理吻合。