科研之友
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摘要
A filament eruption during 2010 April 30-May 1, which shows the reconnection of one filament leg with a region far away from its initial position, is analysed. Observations from three viewpoints are used for measurements of endpoint coordinates as precise as possible. The northern leg of the erupting prominence loop 'jumps' laterally to a latitude lower than the latitude of the original southern endpoint. Thus, the endpoints have reshuffled their positions in the limb view. Although this behaviour could be interpreted as an asymmetric 'zipping-like' eruption, it does not look very likely. It seems more likely to represent reconnection of the flux-rope field lines in the northern leg with ambient coronal magnetic field lines rooted in a quiet region far from the filament. From calculations of coronal potential magnetic field, we found that the filament before the eruption was stable to vertical displacements, but was liable to violation of horizontal equilibrium. This is an unusual initiation of an eruption, with a combination of initial horizontal and vertical flux-rope displacements, showing a new and unexpected possibility for the start of an eruptive event.
- 出版日期2014-8-21
