A model of Martian induced magnetic field and the distribution of magnetic field lines

Based on the facts that there is an ionosphere above the solid Mars but there is no intrinsic magnetic field inside its solid body, and also the characteristic of the interaction between the solar wind and Marian ionosphere, a model of Martian induced magnetic field is proposed. The model is as follows, according to the conservation of current: del . j = 0 (where j is the induced current) and appropriate assumptions on the distribution of the current of Martian Magnetosphere, the expressions of Martian magnetic field can be obtained through Biot-Savart theorem and the distribution of Martian magnetic field lines can be obtained through the use of our program of tracing magnetic field lines. We find that the results obtained via the model of magnetic field are consistent with observational results from satellite and the results gained by using other methods.