fischer@stars.sfsu.edu

¹ Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132
² UCO/Lick Observatory, University of California, Santa Cruz, CA 95064
³ Department of Astronomy, University of California, Berkeley, CA 94720
⁴ Department of Terrestrial Magnetism, Carnegie Institute of Washington DC, 5241 Broad Branch Road NW, Washington DC 20015-1305
⁵ Tokyo Institute of Technology, 2-12-1 Okayama, Meguro-ku, Tokyo 152-8550, Japan
⁶ Center of Excellence in Information Systems, Tennessee State University, 3500 John A. Merritt Boulevard, Box 9501, Nashville, TN 37209
⁷ Department of Earth and Planetary Sciences, Graduate School of Science, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
⁸ Department of Physics, Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan
⁹ Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218
¹⁰ Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208