中文摘要：

构建了一个可以得到火星赤道面上磁场分布的模型.模型根据卫星观测数据,提出了火星电离层、磁层顶和磁尾电流片上都各自通有电流的假设.由电流的连续性条件可知,这三种背景条件下的电流之间满足一定关系,即火星磁层顶上的总电流是电离层上的总电流与磁尾电流片上的总电流之和.这些电流产生的磁场与太阳风磁场共同构成了火星赤道面上磁场分布.通过计算发现,采用这种磁场模型得到的结果与目前卫星所观测的结果以及与采用其他方法得到的结果符合得较好.

英文摘要：

A model of currents around Mars is proposed,upon which the distribution of magnetic field in Martian equatorial plane is calculated.In this model,there exist currents in the Martian magnetopause,the Martian ionosphere and the current sheet in the Martian magnetotail based on the observational data from satellite and appropriate assumptions.According to the continuity of the current,these currents satisfy the relation that the total current in the Martian magnetopause is equal to the summation of the total current in the Martian ionosphere and the total current in the Martian magnetotail.Superposition of the magnetic field generated by these currents and solar wind magnetic field constitutes magnetic field in the Martian equatorial plane.Results obtained through the model of Martian currents are consistent with observational results through satellite and those gained by other methods.