1986年2月4日AR4711拱形双带黑子暗条系激活的分析

根据1986-02-04AR47ll由观测所确定的物理参数和特征值，采用电动力学方法数值计算该活动区中两个拱形黑子暗条在大耀斑爆发前的动力学演化过程.结果表明：（1）以旋涡黑子为标志的光球物质旋转运动和以暗条下方磁力线强剪切为特征的剪切运动引起暗条电流增加和背景磁场变化，电流和磁场的相互作用导致暗条向上运动，大耀斑爆发前暗条的上升速度达26km／S;（2）背景场位形对暗条整体动力学行为有很大影响，AR47ll在7×104km高度范围内场强随高度似乎按指数规律衰减.

ON ACTIVATION OF TWO ARCH-LIKE FILAMENTS 0F FEBRUARY 4, 1986

Using observational data, the images in Ha and white light and the vector magnctogram, the dynamical behaviour of two arch-like filaments in AR47/11 on February 4, l986 before the eruption of a 3B /X3 flare is analytal numerically. It Ieads to the following condusions (l) the rotating motion nearby the footpoints of the filament system and shearing motion in the neighbourhood of the neutral line play an irnportant role in driving upward motion of the filament system. The ascending velocity of the filament can be up to 26 km /s before the flare beginning; (2) the dynamical behaviour of the filament system is influened by the background field medel. The deay of the magneti fiekl along with the hdght is exponenhal in AR4711.