Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heating and Eruption of a Solar Circular Ribbon Flare   We studied a circular-ribbon flare, SOL2014-12-17T04:51, with emphasis on its
thermal evolution as determined by the Differential Emission Measure (DEM)
inversion analysis of the extreme ultraviolet (EUV) images of the Atmospheric
Imaging Assembly (AIA) instrument onboard the Solar Dynamics Observatory (SDO).
Both temperature and emission measure start to rise much earlier than the
flare, along with an eruption and formation of a hot halo over the fan
structure. In the main flare phase, another set of ribbons forms inside the
circular ribbon, and expands as expected for ribbons at the footpoints of a
postflare arcade. An additional heating event further extends the decay phase,
which is also characteristic of some eruptive flares. The basic magnetic
configuration appears to be a fan-spine topology, rooted in a minority-polarity
patch surrounded by majority-polarity flux. We suggest that reconnection at the
null point begins well before the impulsive phase, when the null is distorted
into a breakout current sheet, and that both flare and breakout reconnection
are necessary in order to explain the subsequent local thermal evolution and
the eruptive activities in this confined magnetic structure. Using local DEMs,
we found a postflare temperature increase inside the fan surface, indicating
that the so-called EUV late phase is due to continued heating in the flare
loops.

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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: cs
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The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin