On March 9,1989,a 2N flare erupted in AR5395 active regin (N32.E51) in the solar disc between 0220 UT and 0300 Unaccompa......

AR 5395黑子群内存在着各部分以0～1.1°/天的不等速的平移运动和群体内三个小区域的旋转运动,群体呈现的复杂强磁场结构也在激......