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We have studied three Interplanetary Coronal Mass Ejections (ICMEs) havingclear signatures of magnetic cloud (MC) arrival at 1 AU and their associatedsolar sources during 2011 to 2013. Comparing the axial magnetic field strength(B0) of the near-Sun coronal flux-ropes with that of the MC at 1 AU, we havefound that the average inferred value of B0 at 1 AU assuming the self-similarexpansion of the flux-rope is two times smaller than the value of B0 obtainedfrom the results of MC fitting. Furthermore, by comparing the initialorientation of the flux-rope near the Sun and its final orientation at 1 AU wehave found that the three CMEs exhibited more than 80-degree rotation duringits propagation through the interplanetary medium. Our study suggests thatalthough the near-Sun magnetic properties of coronal flux-ropes can be used toinfer the field strength of the associated MC at 1 AU, it is difficult toestimate the final orientation of the MC axis in order to predict thegeo-effectiveness of the ICMEs.

Geometric and magnetic properties of coronal flux ropes associated with CMEs leading to geomagnetic storms