Department of Physics and Astronomy, The University of Iowa, Iowa City, IA 52242 United States
Department of Physics and Astronomy, The University of Iowa, Iowa City, IA 52242 United States ;
Department of Physics and Astronomy, The University of Iowa, Iowa City, IA 52242 United States ; Faculty of Mathematics and Physics, Charles University, Prague, 18000 Czech Republic ;
Department of Physics and Astronomy, The University of Iowa, Iowa City, IA 52242 United States ;
Department of Physics and Astronomy, The University of Iowa, Iowa City, IA 52242 United States ;
NASA, Goddard Space Flight Center, Greenbelt, MD 20771 United States ;
ISR-1, Space and Atmospheric Science, Los Alamos National Laboratory, Los Alamos, NM 87545 United States ;
CNRS, LPCE et Universite d'Orleans, Orleans, F-45071 France ;
The Blackett Laboratory, Imperial College, London, SW7 2BZ United Kingdom ;