1. Department of Physics, University of Idaho, Moscow, Idaho. Researcher ID: B-1284-2009.
2. Space Science and Astrobiology Division, NASA Ames Research Center, Moffett Field, California.
3. Department of Physics and Physical Science, The University of Nebraska at Kearney, Kearney, Nebraska.
4. Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC.