一个边缘耀斑及其物质抛射的运动

Movements of a Limb Flare and its Mass Ejection

分别对1989年5月8日太阳西南边缘爆发了一个SN级的圆形耀斑部分和柱状物质抛射部分的运动情况进行分析讨论。耀斑圆形直径增大过程的膨胀速度较大,最大为110km/s,时间非常快,从开始产生至膨胀到最大直径15500km仅用了4min时间;减小收缩的过程速度缓慢,为-20^-10km/s,时间过程相对长,从最大直径开始减小到完全消失用了17min时间。柱状物质抛射部分的直径从开始膨胀到最大9060km用了7min时间,最大速度为35km/s;收缩过程用了14min时间,收缩速度在-15^-5km/s左右。柱状物质抛射部分的升降速度,在耀斑极大以后的时间仍在上升,并仍以很高的速度向上喷射,到耀斑极大后3min才开始下降。柱状物质抛射部分到达最大高度22000km的时间与其直径膨胀到最大的时间同时,上升的速度100~130km/s,下降的速度在-20^-5km/s,抛射物质下降到16000~15000km的高度缓慢消失。

A SN circular flare happened on solar southern-west limb on May 8, 1989. There was an outstanding part in the center of the flare,, and the part became later a cylindrical matter that ejected outside in the event. The movements of both the circular flare and the ejection of the cylindrical matter are analyzed and discussed respectively in this paper. An average expand velocity of the circular flare in diameter is measured to be 110 km·s^-1 in maximum, the expansion is so fast that it only takes 4 minutes that the diameter of the flare expands from the beginning to its maximum of 15500 km. But its diameter concentrates slowly, and the average shrinking velocity is about - 20 ～- 10 km·s^-1, it takes 17 minutes that the diameter reduces from the maximum to disappearance. For the ejected cylindrical matter, the expand velocity is 35 km·s^-1 on average, it takes about 7 minutes that the diameter expands from the beginning to its maximum of 9060 km, but the shrinking process is 14 minutes, and the average velocity is - 15 ～ - 5 km·s^-1. The ejected velocity of the cylindrical matter still keeps high speed upward after the flare reaches its maximum, then the velocity begins to be smaller at three minutes after the flare maximum. The time in which the cylindrical ejected matter reaches the maximum height of 22000 km is same as that in which the diameter of the cylindrical matter expands to its maximum, the ejected matter ascending with an average velocity of 100～130 km·s^-1 and descending with an average velocity of - 20 ～- 5 km·s^-1, the matter ejected disappears gradually at the height about 16000 ～ 15000 km.