Institution: | a National Astronomy & Ionosphere Center, Cornell University, Ithaca, New York 14850, U.S.A. b Space Physics Research Laboratory, University of Michigan, Ann Arbor, Michigan 48105, U.S.A. c National Institute for Telecommunications Research of C.S.I.R., P.O. Box 3718, Johannesburg, South Africa d Planetary Aeronomy Branch, Goddard Space Flight Center, Greenbelt, Maryland 20771, U.S.A. e Institute for Physical Science, University of Texas at Dallas, Richardson, Texas 75080, U.S.A f Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, U.S.A. g National Astronomy & Ionosphere Center, Arecibo Observatory, Arecibo, Puerto Rico 00612, U.S.A. |