摘要
本文在非线性无力磁场的等效边界积分方程的基础上，计算了ＮＯＡＡ８１００ 活动区在１９９７ 年１１ 月４ 日的磁场结构。发现该磁场由一个浮现磁环、一个具有微分剪切的多磁环系统、和大尺度或开放磁力线等三部分组成。２Ｂ／Ｘ２ 耀斑是由于浮现磁环与具有微分剪切的多磁环系统和大尺度或开放磁力线之间的相互作用而触发的，发生在浮现磁通量区域附近，并位于不同走向的多个磁环的公共足点处。Ｈβ双带出现在浮现磁通量区域附近，在浮现磁环的足点处。其中位于开放磁力线附近的亮带暗一些。然而在２Ｂ／Ｘ２ 高能耀斑之后，仍然存在着强剪切状态。表明该活动区松弛到了一个低能态但不是最小能量状态。
Based on its equivalent boundary integral equation representation, we reconstruct the finite energy force free magnetic field, of the active region NOAA 8100 on 4 November 1997 above the photosphere. In particular, the 3 D magnetic structures before and after a 2B/X2 flare are analyzed. We found that this flare was triggered by the interaction of an emerging flux loop with a large loop system and large scale, or open field lines. The active region was relaxed to a lower energy state, but not completely to the minimum energy state.
