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- ItemOn the Origin of Hard X-Ray Emissions from the Behind-the-limb Flare on 2014 September 1(London : Institute of Physics Publ., 2021) Wu, Yihong; Rouillard, Alexis P.; Kouloumvakos, Athanasios; Vainio, Rami; Afanasiev, Alexandr N.; Plotnikov, Illya; Murphy, Ronald J.; Mann, Gottfried J.; Warmuth, AlexanderThe origin of hard X-rays and γ-rays emitted from the solar atmosphere during occulted solar flares is still debated. The hard X-ray emissions could come from flaring loop tops rising above the limb or coronal mass ejection shock waves, two by-products of energetic solar storms. For the shock scenario to work, accelerated particles must be released on magnetic field lines rooted on the visible disk and precipitate. We present a new Monte Carlo code that computes particle acceleration at shocks propagating along large coronal magnetic loops. A first implementation of the model is carried out for the 2014 September 1 event, and the modeled electron spectra are compared with those inferred from Fermi Gamma-ray Burst Monitor (GBM) measurements. When particle diffusion processes are invoked, our model can reproduce the hard electron spectra measured by GBM nearly 10 minutes after the estimated on-disk hard X-rays appear to have ceased from the flare site.