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tokens: ACKNOWLEDGEMENTS We thank Alexei Pevtsov for helpful discussions and suggestions. We also thank anonymous referee for his/her helpful comments. SDO is a mission for NASA’s Living With a Star (LWS) programme. The SDO/HMI data were provided by the Joint Science Operation Center (JSOC). Hinode is a Japanese mission developed and launched by ISAS/JAXA, with NAOJ as domestic partner and NASA and STFC (UK) as international partners. It is operated by these agencies in co-operation with ESA and NSC (Norway). This study was supported in part by the Russian Fund for Basic Research (RFBR) projects 17-52-53203 and 17-02-00049, by the National Natural Science Foundation of China projects 11673033, 11703042, 11427901, U1731241, by the cooperative NSFC-RFBR grant 11611530679 and by the Strategic Priority Research Program of the Chinese Academy of Sciences XDA15052200. AK and KK would like to thank the staff at HSOS of National Astronomical Observatories of China for warm hospitality and excellent working environment during their visit.