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Deformation of ICMEs/MCs along their path

机译：ICME / MC沿其路径变形

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摘要

Interplanetary coronal mass ejections (ICMEs) and their subset, magnetic clouds (MCs), are important manifestations of solar activity which have substantial impact on the geomagnetic field. We re-analyze events already identified in Wind and Voyager 2 data and estimate changes of their geometry along the path from the Sun. The analysis is based on the thickness of the sheath between a shock and a particular 1CME or MC which is proportional to the apparent curvature radius of ICMEs/MCs. We have found that this apparent radius of curvature increases with the Mach number and this effect is attributed to the larger deformation of the fast ICME/MC. Further, the relative sheath thickness that is proportional to the flux rope oblateness decreases with the magnetic field intensity inside the ICME/MC and increases with the heliospheric distance.
机译：行星际日冕物质抛射（ICME）及其子集磁云（MC）是太阳活动的重要表现，对地磁场具有重大影响。我们将重新分析Wind和Voyager 2数据中已经确定的事件，并估计它们沿太阳路径的几何形状变化。该分析基于冲击和特定1CME或MC之间的护套厚度，该厚度与ICME / MC的视在曲率半径成比例。我们已经发现，该表观曲率半径随马赫数而增加，并且这种影响归因于快速ICME / MC的较大变形。此外，与通量绳扁度成比例的相对护套厚度随着ICME / MC内部磁场强度的增加而减小，并随着日球距的增加而增加。

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