1. Forschungszentrum Jülich, Jülich Supercomputing Centre; Wilhelm-Johnen-Strase 52425 Jülich Germany
2. CAS Key Laboratory of Geospace Environment, Department of Geophysics & Planetary Sciences; University of Science and Technology of China; Hefei Anhui China
3. Mengcheng National Geophysical Observatory, School of Earth and Space Sciences; University of Science and Technology of China; Hefei Anhui China
4. NorthWest Research Associates, Inc.; Colorado Research Associates Division; Boulder Colorado USA