1. Department of Atmospheric and Oceanic Sciences; University of California; Los Angeles California USA
2. Department of Physics and Astronomy; University of Calgary; Calgary Alberta Canada
3. Solar-Terrestrial Environment Laboratory; Nagoya University; Nagoya Japan
4. Bradley Department of Electrical and Computer Engineering; Virginia Polytechnic Institute and State University; Blacksburg Virginia USA
5. Institute of Space and Atmospheric Studies; University of Saskatchewan; Saskatoon Saskatchewan Canada