School of Earth and Space Sciences Peking University Beijing 100871 China;
Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 ChinaSchool of Astronomy and Space Science University of Chinese Academy of Sciences Beijing 100049 China;
Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 ChinaSchool of Astronomy and Space Science University of Science and Technology of China Hefei 230026 China;
School of Earth and Space Sciences Peking University Beijing 100871 ChinaKey Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China;
School of Astronomy and Space Science Nanjing University Nanjing 210023 China;
Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China;
Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China;
School of Earth and Space Sciences Peking University Beijing 100871 China;
solar magnetic field; solar flare; microwave observation; gyrosynchrotron emission;