tokens: ACKNOWLEDGEMENTS The authors are grateful to the anonymous referee for very helpful suggestions. Numerical calculations have been made possible through a CINECA-ISCRA project and a CINECA-INFN agreement, providing access to resources on MARCONI at CINECA. We acknowledge financial support from the Accordo Attuativo ASI-INAF no. 2017-14-H.0 Progetto: on the escape of cosmic rays and their impact on the background plasma and from the INFN Teongrav collaboration. MB acknowledges support from the European Research Council (ERC starting grant no. 7153 68 MagBURST).
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