Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Particle Acceleration by a Solar Flare Termination Shock   Solar flares - the most powerful explosions in the solar system - are also
efficient particle accelerators, capable of energizing a large number of
charged particles to relativistic speeds. A termination shock is often invoked
in the standard model of solar flares as a possible driver for particle
acceleration, yet its existence and role have remained controversial. We
present observations of a solar flare termination shock and trace its
morphology and dynamics using high-cadence radio imaging spectroscopy. We show
that a disruption of the shock coincides with an abrupt reduction of the
energetic electron population. The observed properties of the shock are
well-reproduced by simulations. These results strongly suggest that a
termination shock is responsible, at least in part, for accelerating energetic
electrons in solar flares.

31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs