tokens: Rosetta is a European Space Agency (ESA) mission with contributions from its member states and the National Aeronautics and Space Administration (NASA). This study was supported by the Academy of Finland and, in part, by the Research Council of Norway grant No. 240000. The work on RPC-ICA was funded by the Swedish National Space Board under contracts 108/12 and 112/13. Work at the Belgian Institute for Space Aeronomy was supported by the Belgian Science Policy Office through the Solar-Terrestrial Centre of Excellence and by PRODEX/ROSETTA/ROSINA PEA 4000107705. First selection of events in this study was performed with the AMDA science analysis system provided by the Centre de Données de la Physique des Plasmas (CDPP) supported by CNRS, CNES, Observatoire de Paris and Université Paul Sabatier, Toulouse. G.G. is supported by the NASA Astrobiology Institute Grant NNX15AE05G and by the NASA HIDEE program Grant NNH15CO73C. C.S.W. thanks T.E. Cravens (University of Kansas, USA), W.J. Miloch (University of Oslo, Norway) and, last but not least, M. Simon Wedlund for useful discussions.
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