  The aim of this study is to generate maps of the hard X-ray emission produced
by energetic electrons in a solar flare and compare them with observations. The
ultimate goal is to test the viability of the combined MHD/test-particle
approach for data-driven modelling of active events in the solar corona and
their impact on the heliosphere. Based on an MHD model of X-class solar flare
observed on the 8th of September 2017, we calculate trajectories of a large
number of electrons and protons using the relativistic guiding-centre approach.
Using the obtained particle trajectories, we deduce the spatial and energy
distributions of energetic electrons and protons, and calculate bremsstrahlung
hard X-ray emission using the 'thin target' approximation. Our approach
predicts some key characteristics of energetic particles in the considered
flare, including the size and location of the acceleration region, energetic
particle trajectories and energy spectra. Most importantly, the hard X-ray
bremsstrahlung intensity maps predicted by the model are in a good agreement
with those observed by RHESSI. Furthermore, the locations of proton and
electron precipitation appear to be close to the sources of helioseismic
response detected in this flare. Therefore, the adopted approach can be used
for observationally-driven modelling of individual solar flares, including
manifestations of energetic particles in the corona, as well as inner
heliosphere.
