1. Department of Electrical and Computer Engineering University of Illinois Urbana IL USA
2. Space Science Division U.S. Naval Research Laboratory Washington DC USA
3. National Space Science Center Chinese Academy of Sciences Beijing China
4. Institute of Energy and Climate Research (IEK‐7) Forschungzentrum Juelich GmbH Juelich Germany
5. Department of Physics University of Wuppertal Wuppertal Germany
6. Applied Physics Laboratory The Johns Hopkins University Baltimore MD USA
7. NASA Langley Research Center Hampton VG USA