University of Washington, Department of Earth and Space Sciences, Seattle, WA 98195, USA
University of Houston, Department of Physics, Houston, TX 77204-5005, USA; University of Washington, Department of Earth and Space Sciences, Seattle, WA 98195, USA
University of Houston, Department of Physics, Houston, TX 77204-5005, USA
University of Houston, Department of Physics, Houston, TX 77204-5005, USA; University of Washington, Department of Earth and Space Sciences, Seattle, WA 98195, USA
University of California at Berkeley, Space Sciences Lab, CA 94720, USA, Berkeley, CA 94720, USA
Aerospace Corporation, Box 92957, Los Angeles, CA 90009-2957, USA
University of Natal, Physics Department, Durban, 4001 South Africa
University of Natal, Physics Department, Durban, 4001 South Africa
University of Washington, Department of Earth and Space Sciences, Seattle, WA 98195, USA
University of California at Berkeley, Space Sciences Lab, CA 94720, USA, Berkeley, CA 94720, USA
University of Washington, Department of Earth and Space Sciences, Seattle, WA 98195, USA
Dartmouth College, Department of Physics and Astronomy, Hanover, NH 03755, USA
North-West University, School of Physics, Potschefstroom, 2520 South Africa
Aerospace Corporation, Box 92957, Los Angeles, CA 90009-2957, USA
University of California at Berkeley, Space Sciences Lab, CA 94720, USA, Berkeley, CA 94720, USA
University of California at Berkeley, Space Sciences Lab, CA 94720, USA, Berkeley, CA 94720, USA
University of California at Berkeley, Space Sciences Lab, CA 94720, USA, Berkeley, CA 94720, USA
University of California at Santa Cruz, SCIPP, Santa Cruz, CA 95064, USA
North-West University, School of Physics, Potschefstroom, 2520 South Africa
Dartmouth College, Department of Physics and Astronomy, Hanover, NH 03755, USA