Relationship between orientations of halo CMEs and the underlying filament / active regions

Details Relationship between orientations of halo CMEs and the underlying filament / active regions Relationship between orientations of halo CMEs and the underlying filament / active regions

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh51c1684k&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH51C-1684

Astronomy and Astrophysics

Astrophysics

[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections

Scientific paper

Coronal mass ejections (CMEs) are the most important objects of space weather studies. Although they have been at focus of many studies for a long time now, there are still many unanswered questions. Here we focus on the possible relationship between the direction of CME rotation and the prevailing magnetic twist of the CME's source region. We could determine the predominant helicity for 45 filaments and active regions that appeared on both hemispheres of the Sun. We thus further confirm that 76% of all source regions in the southern hemisphere were “S” shaped, while 79% of northern hemisphere events were reverse “S” (“Z”) shaped. These ratios agree with the well known hemispheric segregation rule. According to theoretical considerations, (Green, et al. 2007; Lynch, et al. 2009) CMEs, associated with eruption of “S” (“Z') shaped structures are expected to rotate clockwise (counterclockwise). Here we report that 67% of all source regions in the southern hemisphere showed a predominant twist that agreed with the direction of rotation of the corresponding CMEs. In the northern hemisphere this ration was 63%. These findings may significantly improve our understanding of CME evolution and their connection to magnetic clouds. They may are affect our ability to predict severity of geomagnetic storms.

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