کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1781674 | 1022295 | 2011 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Deformation of ICMEs/MCs along their path Deformation of ICMEs/MCs along their path](/preview/png/1781674.png)
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 ICME 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.
► We re-analyze ICME and MC events and estimate changes of their geometry along the path.
► We use the thickness of the sheath between a shock and a ICME/MC to determine their curvature radius.
► The sheath thickness increases with the Mach number.
► The sheath thickness decreases with the magnetic field intensity inside the ICME/MC.
► If the magnetic field inside the ICME/MC is much stronger than that in the ambient solar wind, the ICME/MC cross-section is closer to circular.
Journal: Planetary and Space Science - Volume 59, Issue 9, July 2011, Pages 840–847