Eruption of magnetic flux ropes during flux emergence
V Archontis, T Török - Astronomy & Astrophysics, 2008 - aanda.org
Astronomy & Astrophysics, 2008•aanda.org
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 by
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 …
into the outer atmosphere of the Sun. Methods. We perform 3D numerical experiments by
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 …
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 by 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. In contrast, if the expanding tube is allowed to reconnect with a pre-existing coronal field, the flux rope experiences a full eruption with a rise profile that is in qualitative agreement with erupting filaments and Coronal Mass Ejections.
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