Yuandeng Shen, Yu Liu, Jiangtao Su
We report two sympathetic solar eruptions, including a partial and a full
flux rope eruption in a quadrupolar magnetic region, where a large and a small
filament resided above the middle and the east neutral lines respectively. The
large filament first rose slowly at a speed of 8 km/s for 23 minutes and then
it was accelerated to 102 km/s. Finally, this filament erupted successfully and
caused a coronal mass ejection. During the slow rising phase, various evidence
for breakout-like external reconnection has been identified at high and low
temperature lines. The eruption of the small filament started around the end of
the large filament's slow rising. This filament erupted partially and no
associating coronal mass ejection could be detected. Based on a potential field
extrapolation, we find that the topology of the three-dimensional coronal field
above the source region is composed of three low-lying lobes and a large
overlying flux system, and a null point located between the middle lobe and the
overlying antiparallel flux system. We propose a possible mechanism within the
framework of the magnetic breakout model to interpret the sympathetic filament
eruptions, in which the magnetic implosion mechanism is thought to be a
possible linkage between the sympathetic eruptions, and the external
reconnection at the null point transfers field lines from the middle lobe to
the lateral lobes and thereby leads to the full (partial) eruption of the
observed large (small) filament. Other possible mechanisms are also discussed
briefly. We conclude that the structural properties of coronal fields are
important for producing sympathetic eruptions.
View original:
http://arxiv.org/abs/1202.4867
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