Study of 3-dimensional structure of coronal mass ejections in the interplanetary space

1.利用IPS观测数据模型拟合确定日冕物质抛射的三维结构利用STEL - IPS观测数据反演日冕物质抛射事件的三维密度增强分布，日冕物质抛射事件对地球磁层产生重大影响。对于某些事件，揭示了具有各向同性角范围的壳形结构，对于其他事件，揭示了在给定n方向上拉长的环状结构。通过与航天器观测结果的比较，我们发现这些特征与cme内与冲击相关的压缩区域或日冕抛射相对应。利用宇宙射线调制观测分析大尺度磁场结构我们将杉树大学宇宙射线观测推断出的cme相关的圆柱形磁场结构与STEL - IPS观测确定的环形高密度磁场结构进行了比较。结果，我们发现他们的意见是一致的。这表明磁通量在环形高密度结构的形成中起着重要的作用。2003年10月28日CM E事件的高密度区三维分布与SMEI同步观测重建的高密度区三维分布基本一致。由于从两次观测中确定的环形密度结构的传播速度比震波慢，因此它的起源被认为是被限制在磁通绳内的日冕抛射物。

1.Determination of 3-dimensional(3D)structure of CMEs by the model fitting analysis of IPS observationsThe 3D distribution of density enhancements associated with CMEs was retrieved from STEL IPS observations for CME events, which produced significant influences on the Earth's magnetosphere. A shell-shaped structure with an isotropic angular extent was revealed for some of the events, and a loop structure elongating in a give n direction was disclosed for other events. From comparison with spacecraft observations, we found that these features corresponded to either the compression region associated with the shock or the coronal ejecta within the CME.2.Analysis of large-scale magnetic structure using cosmic ray modulation observationsThe CME-associated cylindrical structure of the magnetic field deduced from cosmic ray observations of the Sh inshu University was compared with the loop-shaped high density structure determined from STEL IPS observat ions. As result, we found that there was general agreement between them. This fact suggests that the magneti c flux plays an important role in formation of the loop-shaped high density structure.3.Analysis of 3D structure using SMEI (Solar Mass Ejection Imager) and IPS dataThe 3D distribution of high density region retrieved from STEL IPS observations for the 2003 October 28 CM E event was found to be consistent with 3D density reconstruction from simultaneous observations by SMEI. S ince the loop-shaped density structure identified from both observations propagated at slower speed than the sh ock, its origin was considered to be the coronal ejecta confined within the magnetic flux rope.