In this paper the evolution of force-free magnetic field was discussed.

本文讨论了太阳活动区和黑子区的无力场的演化。

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Amongst these, one of the most important problem is to solve the boundary value problem for the solar force-free magnetic field equation.

这其中最重要的一个问题就是通过数值方法求解太阳无力磁场方程的边值问题。

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When the magnetic field deviates from potential or force-free field, the field-aligned current can be produced, and it relates closely with the intensity and lifetime of ducts.

当磁场偏离势场或无力场时，将会产生场向电流，该电流与导管的强度和稳定维持密切相关。

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