Korea Astronomy and Space Science Institute, Solar and Space Weather Research Group, Space Science Division, Korea Astronomy and Space Science Institute, 61-1, Hwaam-dong, Yuseong- gu, Daejeon, 305-348, Korea, Republic of; Chungnam National University, Department of Astronomy and Space Science, Chungnam National University, 79 Daehangno, Yuseong-gu, Daeieon, 305-764, Korea, Republic of
Chungnam National University, Department of Astronomy and Space Science, Chungnam National University, 79 Daehangno, Yuseong-gu, Daeieon, 305-764, Korea, Republic of
Korea Astronomy and Space Science Institute, Solar and Space Weather Research Group, Space Science Division, Korea Astronomy and Space Science Institute, 61-1, Hwaam-dong, Yuseong- gu, Daejeon, 305-348, Korea, Republic of