[1] NASA, Planetary Magnetospheres Lab, Solar Syst Explorat Div, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[2] Morgan State Univ, Baltimore, MD 21239 USA
[3] Univ Colorado, Atmospher & Space Phys Lab, Boulder, CO 80309 USA
[4] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA
[5] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA
[6] NASA, Heliophys Sci Div, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[7] Univ Maryland Baltimore Cty, Goddard Planetary Heliophys Inst, Catonsville, MD USA