Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Injection of thermal and suprathermal seed particles into coronal shocks
  of varying obliquity   Context: Diffusive shock acceleration in the solar corona can accelerate
solar energetic particles to very high energies. Acceleration efficiency is
increased by entrapment through self-generated waves, which is highly dependent
on the amount of accelerated particles. This, in turn, is determined by the
efficiency of particle injection into the acceleration process.
  Aims: We present an analysis of the injection efficiency at coronal shocks of
varying obliquity. We assessed injection through reflection and downstream
scattering, including the effect of a cross-shock potential. Both quasi-thermal
and suprathermal seed populations were analysed. We present results on the
effect of cross-field diffusion downstream of the shock on the injection
efficiency.
  Methods: Using analytical methods, we present applicable injection speed
thresholds that were compared with both semi-analytical flux integration and
Monte Carlo simulations, which do not resort to binary thresholds. Shock-normal
angle and shock-normal velocity were varied to assess the injection efficiency
with respect to these parameters.
  Results: We present evidence of a significant bias of thermal seed particle
injection at small shock-normal angles. We show that downstream isotropisation
methods affect the theta-dependence of this result. We show a non-negligible
effect caused by the cross-shock potential, and that the effect of downstream
cross-field diffusion is highly dependent on boundary definitions.
  Conclusions: Our results show that for Monte Carlo simulations of coronal
shock acceleration a full distribution function assessment with downstream
isotropisation through scatterings is necessary to realistically model particle
injection. Based on our results, seed particle injection at quasi-parallel
coronal shocks can result in significant acceleration efficiency, especially
when combined with varying field-line geometry.

37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph