Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh33c..08t&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH33C-08
Astronomy and Astrophysics
Astrophysics
[7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7529] Solar Physics, Astrophysics, And Astronomy / Photosphere
Scientific paper
In previous work it has been shown that the emergence of twisted magnetic flux tubes into the corona can lead to the formation of both stable and eruptive coronal flux ropes, either by the rigid emergence of the tube or by shear flows and reconnection occurring within its expanding upper part. Such an intrusion of new magnetic flux into the corona naturally produces return currents that flow in the opposite direction of the flux rope current. It has been argued that such return currents significantly change the local force balance -- thus could prevent the flux rope from eruption -- and that therefore coronal flux rope models that employ a non-neutralized flux rope current are not suitable to model filament eruptions or coronal mass ejections. Recently, however, Georgoulis et al. have shown from observations that strong non-neutralized currents can exist close to the polarity inversion lines of active regions, particularly in regions that produce eruptions. This raises the question on the physical origin of such non-neutralized currents. In this talk, we will present results from our investigation of the evolution of photospheric and coronal electric currents in the course of the formation of active regions and coronal flux ropes, using the flux emergence simulations by Archontis et al., and we will discuss the implications of our results for coronal eruptions.
Archontis Vasilis
Titov Viacheslav S.
Torok Tibor
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