tokens: ACKNOWLEDGEMENTS The author thanks the observations provided by the Solar Dynamic Observatory , and the referee’s valuable suggestions and comments that highly improved the quality of the paper. This work is supported by the Natural Science Foundation of China (11773068, 11633008, 11403097, and 11533009), the Yunnan Science Foundation (2015FB191 and 2017FB006), the Specialized Research Fund for State Key Laboratories, and the Youth Innovation Promotion Association (2014047) of Chinese Academy of Sciences.
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