Thomas J Immel¹, Michael H Stevens², Scott England³, Robert R Meier⁴, Yen-Jung Wu¹, Brian J Harding⁵, Colin Charles Triplett⁶ and Lilias Claire Gasque⁷, (1)University of California Berkeley, Space Sciences Laboratory, Berkeley, CA, United States, (2)Naval Research Lab DC, Space Science Division, Washington, United States, (3)Virginia Polytechnic Institute and State University, Aerospace and Ocean Engineering, Blacksburg, United States, (4)George Mason University, Department of Physics and Astronomy, Fairfax, United States, (5)University of California, Berkeley, Space Sciences Laboratory, Berkeley, United States, (6)University of Alaska Fairbanks, Fairbanks, United States, (7)Dartmouth College, Department of Physics and Astronomy, Hanover, United States