Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A magnetic reconnection event in the solar atmosphere driven by
  relaxation of a twisted arch filament system   We present high-resolution observations of a magnetic reconnection event in
the solar atmosphere taken with the New Vacuum Solar Telescope, AIA and HMI.
The reconnection event occurred between the threads of a twisted arch filament
system (AFS) and coronal loops. Our observations reveal that the relaxation of
the twisted AFS drives some of its threads to encounter the coronal loops,
providing inflows of the reconnection. The reconnection is evidenced by flared
X-shape features in the AIA images, a current-sheet-like feature apparently
connecting post-reconnection loops in the \halpha$+$1 \AA\ images, small-scale
magnetic cancellation in the HMI magnetograms and flows with speeds of 40--80
km/s along the coronal loops. The post-reconnection coronal loops seen in AIA
94 \AA\ passband appear to remain bright for a relatively long time, suggesting
that they have been heated and/or filled up by dense plasmas previously stored
in the AFS threads. Our observations suggest that the twisted magnetic system
could release its free magnetic energy into the upper solar atmosphere through
reconnection processes. While the plasma pressure in the reconnecting flux
tubes are significantly different, the reconfiguration of field lines could
result in transferring of mass among them and induce heating therein.

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The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom