1. Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
2. Space Sciences Laboratory; University of California; Berkeley California USA
3. Department of Physics and Astronomy; University of Kansas; Lawrence Kansas USA
4. L'Institut de Recherche en Astrophysique et Planétologie; Toulouse France
5. NASA Goddard Space Flight Center; Greenbelt Maryland USA
6. CSST; University of Maryland, Baltimore County; Baltimore Maryland USA
7. Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; Boulder Colorado USA