1. Plasma Physics Division, United States Naval Research Laboratory, 4555 Overlook Ave. SW, Washington, DC 20375, USA
2. Physics Department, University of Colorado at Colorado Springs, 1420 Austin Bluffs Pkwy., Colorado Springs, Colorado 80918, USA
3. Space Science and Applications, Los Alamos National Laboratory, P.O. Box 1663 Los Alamos, New Mexico 87544, USA
4. Space Physics and Atmospheric Research Center, United States Air Force Academy, HQ USAFA/DFP, 2354 Fairchild Dr. Suite 2A31, USAF Academy, Colorado 80840, USA