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The SOL2014-09-01 far-side solar eruptive event produced hard electromagneticand radio emissions observed with detectors at near-Earth vantage points.Especially challenging was a long-duration >100 MeV $\gamma$-ray burst probablyproduced by accelerated protons exceeding 300 MeV. This observation raised aquestion of how high-energy protons could reach the Earth-facing solar surface.Some preceding studies discussed a scenario in which protons accelerated by aCME-driven shock high in the corona return to the solar surface. We continuewith the analysis of this challenging event, involving radio images from theNan\c{c}ay Radioheliograph and hard X-ray data from the High Energy NeutronDetector (HEND) of the Gamma-Ray Spectrometer onboard the Mars Odyssey spaceobservatory located near Mars. HEND recorded unocculted flare emission. Theresults indicate that the emissions observed from the Earth's direction weregenerated by flare-accelerated electrons and protons trapped in static longcoronal loops. Their reacceleration is possible in these loops by a shock wave,which was excited by the eruption, being initially not CME-driven. The resultshighlight the ways to address remaining questions.

Radio, Hard X-Ray, and Gamma-Ray Emissions Associated with a Far-Side Solar Event