Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation mechanisms of quasi-parallel and quasi-circular flare ribbons
  in a confined flare   We analyze a confined multiple-ribbon M2.1 flare (SOL2015-01-29T11:42) that
originated from a fan-spine coronal magnetic field configuration, within active
region NOAA 12268. The observed ribbons form in two steps. First, two primary
ribbons form at the main flare site, followed by the formation of secondary
ribbons at remote locations. We observe a number of plasma flows at
extreme-ultraviolet temperatures during the early phase of the flare (as early
as 15 min before the onset) propagating towards the formation site of the
secondary ribbons. The secondary ribbon formation is co-temporal with the
arrival of the pre-flare generated plasma flows. The primary ribbons are
co-spatial with RHESSI hard X-ray sources, whereas no enhanced X-ray emission
is detected at the secondary ribbons sites. The (E)UV emission, associated with
the secondary ribbons, peaks ~1 min after the last RHESSI hard X-ray
enhancement. A nonlinear force-free model of the coronal magnetic field reveals
that the secondary flare ribbons are not directly connected to the primary
ribbons, but to regions nearby. Detailed analysis suggests that the secondary
brightenings are produced due to dissipation of kinetic energy of the plasma
flows (heating due to compression), and not due to non-thermal particles
accelerated by magnetic reconnection, as is the case for the primary ribbons.

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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: cond-mat
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The categories of this paper are: math
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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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: econ
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex