Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21631402l&link_type=abstract
American Astronomical Society, AAS Meeting #216, #314.02; Bulletin of the American Astronomical Society, Vol. 41, p.893
Astronomy and Astrophysics
Astronomy
Scientific paper
We present an investigation of whether the emergence of sheared flux into the corona can initiate coronal mass ejections (CMEs) in two dimensional geometries. Observations indicate that both flux emergence and sheared magnetic fields are correlated with CME eruptions.
Numerical models of CME eruptions can recreate certain observational features of CMEs using simple two dimensional geometries. These models simply assume the appearance of flux in the corona and do not self-consistently calculate a process for the flux emergence. These simulations do not, therefore, address the significant question of whether and how newly emerged, sheared magnetic flux can rise from its origins in the high beta convection zone to the low corona where it is required to drive CME models.
We study this problem by simulating the dynamical emergence of twisted magnetic flux tubes from a high beta convection zone into the low beta corona in CME eruptive configurations. We focus here on the breakout CME model, which injects sheared flux at a low beta lower boundary. The presence of this shear energy can drive eruptions in quadrupolar coronal configurations. We simulate, in 2D, the emergence of flux tubes with a range of twist and shear profiles into field-free, dipolar and quadrupolar coronas. In all cases we find that the dense plasma which is entrained in the emerging flux ropes and the inability of shear energy to reach sufficient heights in the corona prevent eruptions. CME models becomes significantly more difficult when the self-consistent dynamics of flux emergence are taken into account. These results present strong difficulties for all CME models. We suggest mechanisms for the removal of dense matter from emerging flux tubes which will allow the eruption of coronal magnetic field structures.
Antiochos Spiro
Leake James E.
Linton Mark
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