tokens: The authors wish to thank Julia Lawless for useful discussions and the anonymous referee for very detailed suggestions that helped clarify the manuscript. D.M.L. acknowledges support from the European Commission’s H2020 Programme under the following Grant Agreements: GREST (No. 653982) and Pre-EST (No. 739500) as well as support from the Leverhulme Trust for an Early Career Fellowship (ECF-2014-792) and is grateful to the Science Technology and Facilities Council for the award of an Ernest Rutherford Fellowship (ST/R003246/1). G.V. was funded by the Leverhulme Trust under grant 2014-051. J.M.J. thanks the STFC for support via funding given in his PhD Studentship. Facilities: SDO , GONG. Software: SolarSoftWare (Freeland Handy 1998 ).
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