FU Yuan Chang¹, Chi-Yen Lin¹, I-Te Lee², Yuh-Ing Chen³, Chi-Kuang Chao¹ and iSTEP, (1)Center for Astronautical Physics and Engineering, National Central University, Taoyuan City, Taiwan, (2)College of Earth Sciences, National Central University, Taipei City, Taiwan, (3)Graduate Institute of Statistics, National Central University, Taoyuan City, Taiwan