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The 2015 March 15 coronal mass ejection as one of the two that together drovethe largest geomagnetic storm of solar cycle 24 so far was associated withsympathetic filament eruptions. We investigate the relations between thedifferent filaments involved in the eruption. A surge-like small-scale filamentmotion is confirmed as the trigger that initiated the erupting filament withmulti-wavelength observations and using a forced magnetic field extrapolationmethod. When the erupting filament moved to an open magnetic field region, itexperienced an obvious acceleration process and was accompanied by a C-classflare and the rise of another larger filament that eventually failed to erupt.We measure the decay index of the background magnetic field, which presents acritical height of 118 Mm. Combining with a potential field source surfaceextrapolation method, we analyze the distributions of the large-scale magneticfield, which indicates that the open magnetic field region may provide afavorable condition for F2 rapid acceleration and have some relation with thelargest solar storm. The comparison between the successful and failed filamenteruptions suggests that the confining magnetic field plays an important role inthe preconditions for an eruption.

Sympathetic Solar Filament Eruptions on 2015 March 15