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

行星际空间中日冕物质抛射的三维结构研究

基本信息

批准号：
16340147
负责人：
TOKUMARU Munetoshi
金额：
$ 10.12万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16340147/
关键词：
CME Interplanetary shock Solar wind Interplanetary scintillation Magnetic cloud

项目摘要

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.

1.利用IPS观测数据的模型拟合分析确定CME的三维结构利用STEL IPS观测数据反演了CME事件的三维密度增强分布，CME事件对地球磁层有重要影响。一个壳状结构与各向同性的角范围被揭示的一些事件，并在给定的n方向拉长的环结构被披露的其他事件。通过与航天器观测结果的比较，我们发现这些特征要么对应于与冲击相关的压缩区域，要么对应于日冕物质抛射内的日冕喷出物。2.使用宇宙线调制观测分析大尺度磁结构从Shin shu大学的宇宙线观测中推导出的与日冕物质抛射相关的磁场圆柱形结构与环进行了比较-从STEL IPS观测确定了高密度结构。结果，我们发现他们之间有普遍的协议。3.利用太阳质量抛射成像仪（SMEI）和IPS资料对3D结构的分析2003年10月28日CM E事件的STEL IPS资料反演的高密度区的3D分布与SMEI同步观测的3D密度重建结果一致。因斯从两次观测中识别出的环状密度结构的传播速度比冲击慢，因此认为其起源是限制在磁通量绳内的日冕喷出物。