1. NASA Ames Research Center, Space Science Division, Moffett Field, California, USA.
2. SETI Institute, Mountain View, California, USA.
3. Space Sciences Center and Department of Physics and Astronomy, University of Southern California, Los Angeles, California, USA.
4. Department of Physics, National Central University, Jhongli, Taiwan.
5. National Synchrotron Radiation Research Center, Hsinchu, Taiwan.
6. Graduate Institute of Astronomy, National Central University, Jhongli, Taiwan.