1. Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
2. Beijing National Observatory of Space Environment Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
3. College of Earth and Planetary Sciences University of the Chinese Academy of Sciences Beijing China
4. Laboratory of Atmospheric and Space Physics University of Colorado Boulder Boulder CO USA
5. High Altitude Observatory National Center for Atmospheric Research Boulder CO USA
6. Private Kühlungsborn Germany