1. School of Earth and Space Sciences, Peking University, Beijing 100871, People’s Republic of China.
2. Big Bear Solar Observatory, New Jersey Institute of Technology, 40386 North Shore Lane, Big Bear City, CA 92314-9672, USA.
3. Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, D-37077 Göttingen, Germany.
4. NASA Marshall Space Flight Center, Huntsville, AL 35812, USA.
5. Solar Physics and Space Plasma Research Centre, School of Mathematics and Statistics, University of Sheffield, Hounsfield Road, Sheffield S3 7RH, UK.
6. Department of Astronomy, Eötvös Loránd University, Budapest, H-1117 Budapest, Hungary.
7. Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, People’s Republic of China.
8. Institute for Geophysics, Astrophysics and Meteorology–Institute of Physics, University of Graz, Universitätsplatz 5, 8010 Graz, Austria.
9. Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India.