耀斑与磁环拓扑界面附近的色球视向速度

在一些活动区中，耀斑与光球层磁对消的密切关系，已被观测确认，磁对消先于耀斑几小时到一天，此时，色球视向速度场呈现特定的式样，即在磁环拓扑界面上，出现紫移窄带，而耀斑亮块均落在拓扑界面两边的红移区，这一观测事实支持磁对消为低层大气的磁重联，并证实这种重联与日冕中的能量快速释放有密切关系。

FLARES AND VELOCITY PATTERNS IN THE VICINITY OF SEPARATRICES

In a few active regions, the close association of flares to flux cancellation in the photosphere has been observationally revealed. Usllally, flares are preceded by cancellation from several hours to a day. In this environment, we further identify a characteristic velocity pattern: a narrow band of blue shift in the separatrices and rather broad patches of red shift on both sides where there would appear flare ribbons. This revelation indicates that the cancellation of magnetic flux is basically a slow magnetic reconnection in the lower atmosphere, and this slow reconnection has immediate bearing on the fast energy release in the corona.