*P. K. Rajesh¹, J. Y. Liu², Charles Lin¹, A. B. Chen³, R. R. Hsu³, C. H. Chen¹, J. D. Huba⁴ (1.Department of Earth Science, National Cheng Kung University, Taiwan, 2.Institute of Space Science, National Central University, Taiwan, 3.Department of Physics, National Cheng Kung University, Taiwan, 4.Plasma Physics Division, Naval Research Laboratory, Washington, D.C., USA)