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tokens: Acknowledgements IRIS is a NASA Small Explorer mission developed and operated by LMSAL, with mission operations executed at NASA Ames Research Center and major contributions to downlink communications funded by the Norwegian Space Centre through a European Space Agency PRODEX contract. The Solar Dynamics Observatory (SDO) data that we used are provided courtesy of NASA/SDO and the Atmospheric Imaging Assembly and Helioseismic and Magnetic Imager science teams. The authorsthank the anonymous referee for suggestions. We thank Y. Chen, Z.J. Ning, Y. Li, and L.P. Yang for valuable discussions. The work at Peking University is supported by NSFC under contracts 41574168, 41231069, 41274172, 41474148, 41421003. LM Yan is supported by National Postdoctoral Program for Innovative Talents (grant BX201600159). J.S. H.E. is also supported by “National Youth Talent Support Program” of China. L.D. Xia is supported by NSFC under contracts 41274178 and 41474150.