1. Space Sciences Laboratory; University of California; Berkeley CA USA
2. Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; CO Boulder USA
3. Physics Department; Eastern Michigan University; Ypsilanti MI USA
4. NASA Goddard Space Flight Center; Greenbelt MD USA
5. Department of Climate and Space Sciences and Engineering; University of Michigan; Ann Arbor MI USA
6. IRAP; CNRS-University of Toulouse-UPS-CNES; Toulouse France