1. Institute of Solar-Terrestrial Physics SB RAS, Irkutsk 664033, Russia
2. Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, UK
3. Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Science, Beijing 100101, People’s Republic of China
4. School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, People’s Republic of China