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

Published online by Cambridge University Press:  27 November 2018

Ranadeep Sarkar Open the ORCID record for Ranadeep Sarkar [Opens in a new window]  and
Nandita Srivastava Open the ORCID record for Nandita Srivastava [Opens in a new window]
Ranadeep Sarkar
Affiliation:
Udaipur Solar Observatory, Physical Research Laboratory, Badi Road, Udaipur 313001, India email: [email protected] email: [email protected]
Nandita Srivastava
Affiliation:
Udaipur Solar Observatory, Physical Research Laboratory, Badi Road, Udaipur 313001, India email: [email protected] email: [email protected]
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Abstract

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We have studied three Interplanetary Coronal Mass Ejections (ICMEs) having clear signatures of magnetic cloud (MC) arrival at 1 AU and their associated solar 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 have found that the average inferred value of B0 at 1 AU assuming the self-similar expansion of the flux-rope is two times smaller than the value of B0 obtained from the results of MC fitting. Furthermore, by comparing the initial orientation of the flux-rope near the Sun and its final orientation at 1 AU we have found that the three CMEs exhibited more than 80° rotation during its propagation through the interplanetary medium. Our study suggests that although the near-Sun magnetic properties of coronal flux-ropes can be used to infer the field strength of the associated MC at 1 AU, it is difficult to estimate the final orientation of the MC axis in order to predict the geo-effectiveness of the ICMEs.

Keywords

Flarescoronal mass ejections (CMEs)magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S340: Long-term Datasets for the Understanding of Solar and Stellar Magnetic Cycles , February 2018 , pp. 191 - 192
Copyright
Copyright © International Astronomical Union 2018 

References

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