Three-dimensional Magnetic Reconnection Triggering an X-class Confined Flare in Active Region 12192 |
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Ting Li Submitted: 2018-11-08 19:15
We present an extensive analysis of the X2.0-class confined flare on
2014 October 27 in the great active region AR 12192, observed by the
IRIS and the SDO. The slipping motion of the substructures
within the negative-polarity flare ribbon (R1) and continual
reconnection-induced flows during the confined flare are first
presented. The substructures within ribbon R1 were observed to slip
in opposite directions at apparent speeds of 10-70 km s-1. The
slipping motion exhibited the quasi-periodic pattern with a period
of 80-110 s, which can be observed since the flare start and
throughout the impulsive phase of the flare. Simultaneously
quasi-periodic flows moved along a reverse-S shaped filament, with
an average period of about 90 s. The period of reconnection-induced
flows is similar to that of the slippage of ribbon substructures,
implying the occurrence of quasi-periodic slipping magnetic
reconnection. The spectral observations showed that the Si IV
line was blueshifted by 50-240 km s-1 at the location of the
flows. During the process of the flare, the filament did not show
the rise phase and was not associated with any failed eruption. The
flare mainly consisted of two sets of magnetic systems, with both of
their east ends anchoring in ribbon R1. We suggest that the slipping
magnetic reconnection between two magnetic systems triggers the
confined flare.
Authors: Ting Li, Yijun Hou, Shuhong Yang & Jun Zhang
Projects: IRIS
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Publication Status: accepted for publication in ApJ
Last Modified: 2018-11-09 15:38
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