Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh23b1855s&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH23B-1855
Astronomy and Astrophysics
Astrophysics
[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields
Scientific paper
It has been suggested that coronal mass ejections remove the magnetic helicity of active regions from the Sun. Such removal is often regarded to be necessary due to the hemispheric sign preference of the helicity, which inhibits a simple annihilation by reconnection between volumes of opposite chirality. We have monitored the relative magnetic helicity contained in the coronal volume of a simulated flux rope CME, as well as the upward flux of helicity through a horizontal plane in the simulation box. The unstable and erupting flux rope carries away only part of the initial helicity through the open upper boundary of the box; the larger part remains in the volume. We offer a simple physical explanation for this result. Since most active regions erupt only once in their lifetime, our finding suggests that the major part of the helicity which is transported into the corona by emerging active regions is redistributed into the coronal field upon the dispersal of the active regions and is eventually transported back into the solar interior as the field submerges.
Kliem Bernhard
Seehafer Norbert
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