1. NASA/Goddard Spaceflight Center, Greenbelt, Maryland 20771, USA
2. The Department of Physics and Astronomy, The University of Leicester, Leicester LE1 7RH, United Kingdom
3. Department of Physics and Astronomy, University of Kansas, 1251 Wescoe Hall Dr., Lawrence, Kansas 66045, USA
4. Department of Physics, University of Miami, Coral Gables, Florida 33124, USA
5. CNRS/INSU, LATMOS-IPSL, Université Versailles St-Quentin, Sorbonne Universités, UPMC Univ. Paris 06, 11 Boulevard d’Alembert, 78280 Guyancourt, France
6. Department of Physics, Siena College, Loudonville, New York 12211, USA
7. The Henry A. Rowland Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA
8. Space Sciences Laboratory, University of California, Berkeley, California 94720, USA