一个拱桥状爆发日珥  

An Arcade-like Eruptive Prominence

作　　者：钟树华[1] 占腊生[1] 

机构地区：[1]中国科学院国家天文台云南天文台,云南昆明650011

出　　处：《天文研究与技术》2004年第4期268-273,共6页Astronomical Research & Technology

摘　　要：1991年3月7日在太阳东北边缘产生了一个爆发日珥。它产生在没有耀斑、暗条、黑子等其它太阳活动现象的一个相对宁静的日面区域。日珥抛射的最大高度为6.97×104km,最大长度为11.6×104km,从形态的大小来看它属于中等偏小的爆发日珥。抛射的时间过程,上升阶段非常快,而下降阶段则较缓慢,有类似于耀斑爆发的时间过程。日珥爆发后的绝大部分物质基本上在磁场作用下沿磁力线作抛物线运动形成拱桥形状,并保持到消失。日珥下降前后,顶端有少部分物质被抛射脱离日珥主体部分,扩散到行星际空间。An eruptive prominence happened on the east-northern limb of the Sun on March 7,1991.It appeared in a relatively quiet region where any activity phenomena such as flare,filament and sunspot etc.was not found.The maximum height reachable of the prominence was 6.97×10~4 km and its maximum length reached as 11.6×10~4 km.The eruptive prominence might belong to the one of the middle-smaller scale according to its size in morphology.The course of the eruption exhibited some properties:ascending rapibly and descending slowly just like the process of the flare eruption.After the eruption,the most material in the prominence basically moved along a parabola under the action of magnetic force lines forming the arcade-like shape and keeping it till to the disappearance of the prominence.Before and after descending,a little matter came from the top part was ejected and divorced from the main body of the prominence and diffused into the interplanetary space.

关 键 词：耀斑 行星际 黑子 太阳活动 爆发 下降 上升 形成 大小 形状 

分 类 号：P182[天文地球—天文学]