1. Space Science Division; Korea Astronomy and Space Science Institute; Daejeon Korea
2. Department of Astronomy and Space Science; Kyung Hee University; Kyunggi Korea
3. Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
4. Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
5. Space Environment Research Center; Kyushu University; Fukuoka Japan