[1
]Space Vehicles Directorate; Air Force Research Laboratory, Kirtland Air Force Base;
Albuquerque New Mexico USA
[2
]Institute for Scientific Research; Boston College; Chestnut Hill Massachusetts USA
[3
]Now at Space Dynamics Laboratory; Logan Utah USA
[4
]QinetiQ; Malvern United Kingdom
[5
]Now at University of Birmingham; Birmingham United Kingdom
[6
]Plasma Physics Division; Naval Research Laboratory; Washington District of Columbia
USA
[7
]Department of Electrical and Computer Engineering; University of Illinois at Urbana-Champaign;
Urbana Illinois USA