tokens: We acknowledge the CLUSTER FGM and EFW P.Is. and teams and the ESA Cluster Science Archive team for making the data used in this work available. The research leading to these results has received funding from the European Community’s Seventh Framework Programme ([FP7/2007–2013]) under grant agreement No. 313038/STORM. S.G. acknowledges support from the Agenzia Spaziale Italiana (ASI) under contract ASI-INAF n. I/022/10/2.
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