*Ya-Hui Yang¹, Min-Shiu Hsieh², Hsiu-Shan Yu³, P. F. Chen⁴ (1.Institute of Space Science, National Central University, Taiwan, 2.Geophysical Institute, University of Alaska Fairbanks, USA, 3.Center for Astrophysics and Space Sciences, University of California San Diego, USA, 4.School of Astronomy and Space Science, Nanjing University, China)