Relation between Magnetic Helicity and CME Speed in Source Active Regions

Details Relation between Magnetic Helicity and CME Speed in Source Active Regions Relation between Magnetic Helicity and CME Speed in Source Active Regions

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh41b1669j&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH41B-1669

Astronomy and Astrophysics

Astrophysics

[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields

Scientific paper

We report on a study linking the speed of coronal mass ejections (CMEs) to the magnetic helicity in the source active regions. The motivation comes from the fact that the CME speed may depend on the active region free magnetic energy, which in turn may be represented by the helicity, a proxy for the nonpotentiality. We selected a set of active regions from solar cycle 23, measured their helicity, and identified CMEs from the CME catalog (http://cdaw.gsfc.nasa.gov). Using EUV and magnetogram data from the Solar and Heliospheric Observatory (SOHO) mission, we measured the coronal helicity content before CME eruptions. We extrapolated the photospheric magnetic field to the corona to obtain the coronal helicity that fits a EUV image before each CME eruption. The CME speeds used here corresponds to the average speed within the SOHO coronagraphic field of view. We found that magnetic helicity is positively correlated with the speed of CME. We cross-checked the helicity values using the principle of magnetic helicity conservation connecting helicity obtained from the Local Correlation Tracking (LCT) method, the helicity of the associated magnetic clouds and the coronal helicity.

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