Relationship Between Orientations of Halo Coronal Mass Ejections, EIT Flare Arcades, Heliospheric Current Sheet and Magnetic Clouds

Details Relationship Between Orientations of Halo Coronal Mass Ejections, EIT Flare Arcades, Heliospheric Current Sheet and Magnetic Clouds Relationship Between Orientations of Halo Coronal Mass Ejections, EIT Flare Arcades, Heliospheric Current Sheet and Magnetic Clouds

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2928y&link_type=abstract

American Astronomical Society Meeting 210, #29.28; Bulletin of the American Astronomical Society, Vol. 39, p.325

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Coronal mass ejections (CMEs) are the most important solar drivers of geomagnetic storms. Their interplanetary counterparts, interplanetary CMEs (ICMEs), can be detected in-situ, for example, by ACE and Wind spacecraft. An ICME usually exhibits a complex structure that very often includes a magnetic cloud (MC), which is thought to be a magnetic flux rope, capable of providing prolonged periods of southward interplanetary magnetic field at 1 AU. In our recent study we found that the orientation of a halo CME elongation corresponds to the orientation of the underlying flux rope. This is a continuation of this recent research and here we compare orientation angles of elongated LASCO halo CMEs, EIT flare arcades (post flare loop system), the local tilt of the heliospheric current sheet and the corresponding MCs. We report that i) for about 64% of CME-ICME events, a good correspondence was found between the orientation angles of CMEs and MC; ii) 20 out of 25 CMEs (80%) were oriented along the axis of the corresponding EIT flare arcade; and iii) 17 out of 25 (68%) of MCs are co-aligned with the heliospheric current sheet at 2.5 solar radii. In the final part of the presentation we will discuss the applications of our findings to CME modeling, space weather forecast and possible future studies.

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