对2007年5月23日的一个CME的起源和初始阶段的观测研究

发布时间：2018-05-31 16:44

本文选题：太阳 + 日冕物质抛射　；参考：《天文学报》2010年02期

【摘要】：利用多波段联合观测数据,综合分析研究了一个发生于2007年5月23日的日冕物质抛射(Coronal Mass Ejection,CME)爆发事件的起源和初始阶段的物理演化过程.该CME起源于活动区10956内的一个并没有严格地位于活动区极性反转线上的U形活动区暗条,该暗条首先被扰动,然后从中间部分开始缓慢上升.在暗条上升运动过程中,从极紫外和软X射线像上可观测到位于暗条上方的日冕磁环也在不断地上升并且有持续向外的扩张运动.最终,这些冕环和暗条一起爆发并伴随着一个位于暗条断开位置附近的日冕暗化区域的形成.这一爆发过程还伴随着一个静止轨道业务卫星(GeostationaryOperational Environmental Satellites,GOES)软X射线流量级别为B5.3的亚耀斑发生,该光斑显示出与CME之间具有在时间和空间上的紧密联系.与CME的"标准"磁流绳模型一致,这些太阳表面活动可以看作是CME的初始演化阶段在日面上的表现信号,并且该CME的亮前锋可能是由预先存在于暗条上方的冕环体系直接演化而来.另外,文中还讨论了与该事件相关的暗条爆发、耀斑、冕环扩张和消失以及日冕暗化之间的关系.
[Abstract]:The origin and physical evolution of a coronal Mass ejection event which occurred on May 23, 2007 were studied by using the multi-band joint observation data. The CME originates from a U-shaped active strip in the active region 10956 which is not strictly located on the polar inversion line of the active region. The dark strip is first disturbed and then rises slowly from the middle part. During the rising of the dark strip, the coronal magnetic ring located above the dark strip can be observed from the extreme ultraviolet and soft X-ray images. Eventually, these coronal rings erupt with dark strips and are accompanied by the formation of a coronal darkening region near the break of the strip. The explosion was also accompanied by a subflare with a soft X-ray flow level B5.3 of Geostation operational Environmental satellites (go), which showed a close relationship with CME in time and space. Consistent with CME's "standard" flux rope model, these solar surface activities can be regarded as the signal of the initial evolution of CME on the solar surface. Moreover, the bright front of the CME may have evolved directly from the coronal ring system which preexisted above the dark strip. In addition, the relationships between the dark strip burst, flare, coronal ring dilatation and disappearance and coronal darkening associated with the event are also discussed.
【作者单位】：中国科学院国家天文台/云南天文台;中国科学院研究生院;
【基金】：国家自然科学基金(10573033,40636031,10933003) 973计划(2006CB806303) 云南省应用基础研究计划(2007A115M)资助项目
【分类号】：P182

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