1. Department of Astronomy and Space Science; Chungnam National University; Daejeon Korea
2. NASA Goddard Space Flight Center; Greenbelt; Maryland USA
3. Solar and Space Weather Research Group; Korea Astronomy and Space Science Institute; Daejeon Korea
4. School of Space Research; Kyung Hee University; Yongin Korea
5. National Oceanic and Atmospheric Administration; Boulder Colorado USA
6. Department of Physics; New Jersey Institute of Technology; Newark New Jersey USA