Deformation of ICMEs/MCs along their path

Details Deformation of ICMEs/MCs along their path Deformation of ICMEs/MCs along their path

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011p%26ss...59..840l&link_type=abstract

Planetary and Space Science, Volume 59, Issue 9, p. 840-847.

Physics

Scientific paper

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.

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