活动区磁场的不同缠绕形式(英文)

ACTIVE REGION MAGNETIC FIELDS WITH DIFFERENT CHIRALITY

利用北京怀柔太阳观测站的矢量磁向仪在 1988- 1996年期间观测的 2 86个偶极活动区 ,探讨了磁极轴的倾斜角和磁场缠绕参数 h‖ 之间的符号关系 .由此得到结论 :1)在第 2 2太阳活动周 ,有 60 %的偶极活动区此两参数符号之间有统计上的负关系 ,即在南 /北半球当缠绕参数 h‖ 为正 /负时 ,磁极轴的倾斜角为负 /正 ,具有相反螺度的“正常缠绕”;2 )大约 1/ 3的活动区此两参数具有相同符号 ,具有相同螺度的“反常缠绕”,而且它们大多分布在某些特殊经度上 ;3)在第 2 2太阳活动周的 62个 M-级以上的

active regions in which bipolar magnetic fields are dominant, were chosen from data set of photospheric vector magnetograms observed at Huairou Solar Observing Station in Beijing during 1988-1996. The relationship in sign between tilt angles of magnetic polarity axis and mean twist parameters h ‖ were explored. The following results are obtained: 1)There is a statistical negative correlation in sign between the tilt angles and the twist parameters for almost 60% of bipolar active regions in the 22nd active cycle. It is referred that almost 60% of bipolar active regions are positive/negative tilts to the equator as twist parameters are negative/positive, a ‘normal chirality’ with ‘counter helicity’, in northern/southern hemisphere. 2)About one third of the active regions are same sign as twist parameters, an ‘abnormal chirality’ with ‘co helicity’. And, these active regions are mostly distributed at some special longitudes. 3)Most of 62 X ray flares larger than M level in the 22nd active cycle are located at the similar longitudes as those active regions with ‘co helicity’.