冕洞边界区磁结构的探讨

AN INVESTIGATION OF MAGNETIC STRUCTURES AT THE BOUNDARY REGIONS OF CORONAL HOLES

摘要用Hell083nm单色像上的极区、低纬冕洞的边界,确定Fe]532.4nm纵向场全日面磁图上对应的极,低纬冕洞的边界.对光球上极、低纬冕洞边界足根连线范围内外的磁场强度,磁极性、磁场几何位形进行了分析讨论.观测结果表明t就极无涧大尺度范围来看,是单极开放场I就48h时标的加强磁结构来说,以开放场为主的情况下,有开放场与闭合场栩混杂的情况.就同时的极冕洞与低纬度冕洞边界足根连线附近磁场位形相比较,差别是明显的.

The boundaries of polar coronal holes and lower latitude coronal holes at the magnetograms of full solar disk of FeI 532.4nm, Longitudinal field are determined by their boundaries in HeI 1083nm monochromatic images. The magnetic field strength, the magnetic polarity and the geometric configuration inside and outside the region of connecting line oftheir boundary foot-points in photosphere are analyzed and discussed. The results of observation show: For large scale region, polar coronal hole is unipolar open field; For enhanced magnetic structures of 48h time scale, open field is dominant, however, the mixing case of open field and closed field is also present; According to the comparison of simultaneous magnetic configurion near connecting line of the boundary foot-points between polar coronal hole and lower latitude coronal hole, the difference is obvious.