Eruption of magnetic flux ropes during flux emergence

Details Eruption of magnetic flux ropes during flux emergence Eruption of magnetic flux ropes during flux emergence

2008-11-07

arxiv.org/abs/0811.1134v1

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1051/0004-6361:200811131

Aims: We investigate the formation of flux ropes in a flux emergence region and their rise into the outer atmosphere of the Sun. Methods: We perform 3D numerical experiments solving the time-dependent and resistive MHD equations. Results: A sub-photospheric twisted flux tube rises from the solar interior and expands into the corona. A flux rope is formed within the expanding field, due to shearing and reconnection of field lines at low atmospheric heights. If the tube emerges into a non-magnetized atmosphere, the flux rope rises, but remains confined inside the expanding magnetized volume. On the contrary, if the expanding tube is allowed to reconnect with a preexisting coronal field, the flux rope experiences a full eruption with a rise profile which is in qualitative agreement with erupting filaments and Coronal Mass Ejections.

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