1. Southwest Research Institute, San Antonio, Texas 78238, USA
2. NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA
3. Department of Physics, Catholic University of America, Washington DC 20064, USA
4. Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, South Korea
5. Department of Astronomy and Space Science, Chungbuk National University, Cheongju 28644, South Korea
6. National Fusion Research Institute, Daejeon 34133, South Korea
7. Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA
8. School of Space Research, Kyung Hee University, Yongin 17104, South Korea
9. Korea Astronomy and Space Science Institute, Daejeon 34055, South Korea