Affiliation: | 1. College of Science, China Three Gorges University, Yichang 443002, China;2. Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;3. Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China;1. Department of Physics and Astronomy, Butler University, Indianapolis, IN 46208, USA;2. College of Science/Department of Physics & NAOC-GZU-Sponsored Center for Astronomy Research, Guizhou University, Guiyang 550025, PR China;3. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, PR China;1. School of Studies in Physics, Jiwaji University, Gwalior 474011, India;2. Greater Noida Institute of Technology, Plot No. 7, Knowledge Park-II, Greater Noida 201306, India;3. Department of Physics, Lovely Professional University, Phagwara 144411, India;4. Zentrum für Astronomie und Astrophysik, Technische Universität Berlin, Hardenbergstrasse 36, D-10623 Berlin, Germany |