tokens: The STEREO /SEPT, Chandra /EPHIN, and SOHO /EPHIN project is supported under grant 50OC1702 by the Federal Ministry of Economics and Technology on the basis of a decision by the German Bundestag. R.G.H. acknowledges the Spanish MICIU/FEDER/AEI for the financial support under project ESP2017-88436-R. I.G.R. acknowledges support from NASA programs NNH17ZDA001N and NH14ZDA001N-LWS, and from the STEREO mission. F.E. and N.D. acknowledge support from NASA grant NNX17AK25G. Additional support from an Alexander von Humboldt group linkage program is appreciated. We thank the International Space Science Institute (ISSI) for hosting our team on “Solar flare acceleration signatures and their connection to solar energetic particles.” Financial support by the Deutsche Forschungsgemeinschaft (DFG) via project GI 1352/1-1 is acknowledged. We thank Dr. R. D. Strauss, Dr. E. Kontar, and Dr. A. Warmuth for helpful discussions.
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