School of Earth and Space Sciences Peking University Beijing 100871 China;
Yunnan Observatories Chinese Academy of Sciences Kunming 650011 China;
Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing 100101 China;
School of Earth and Space Sciences Peking University Beijing 100871 China;
School of Earth and Space Sciences Peking University Beijing 100871 China;
Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing 100101 China;