AbstractCoronal mass ejections (CMEs) observed near the Sun via LASCO coronographic imaging are the most important solar drivers of geomagnetic storms. ICMEs, their interplanetary, near-Earth counterparts, can be detected in situ, for example, by the Wind and ACE spacecraft. An ICME usually exhibits a complex structure that very often includes a magnetic cloud (MC). They can be commonly modelled as magnetic flux ropes and there is observational evidence to expect that the orientation of a halo CME elongation corresponds to the orientation of the flux rope. In this study, we compare orientations of elongated CME halos and the corresponding MCs, measured by Wind and ACE spacecraft. We characterize the MC structures by using the Grad–Shafranov reconstruction technique and three MC fitting methods to obtain their axis directions. The CME tilt angles and MC fitted axis angles were compared without taking into account handedness of the underlying flux rope field and the polarity of its axial field. We report that for about 64% of CME–MC events, we found a good correspondence between the orientation angles implying that for the majority of interplanetary ejecta their orientations do not change significantly (less than 45deg rotation) while travelling from the Sun to the near-Earth environment.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Orientations of LASCO Halo CMEs and their connection to the flux rope structure of interplanetary CMEs


    Contributors:
    Yurchyshyn, V. (author) / Hu, Q. (author) / Lepping, R.P. (author) / Lynch, B.J. (author) / Krall, J. (author)

    Published in:

    Advances in Space Research ; 40 , 12 ; 1821-1826


    Publication date :

    2007-01-29


    Size :

    6 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





    The Marseille-Artemis Catalog of LASCO CMES

    Boursier, Y. / Lamy, P. / Llebaria, A. et al. | British Library Conference Proceedings | 2006


    Remote Radio Tracking of Interplanetary CMEs

    Reiner, M. J. et al. | British Library Online Contents | 1997


    Characteristics of interplanetary CMEs observed by Ulysses

    Benjamin, A. Dickson | Online Contents | 2010


    Signatures of Fast CMEs in Interplanetary Space

    Bothmer, V. | Online Contents | 1995