1. Center for Space Science and Engineering Research and Department of Electrical and Computer Engineering; Virginia Polytechnic Institute and State University; Blacksburg Virginia USA
2. Department of Physics; Augsburg College; Minneapolis Minnesota USA
3. Helmholtz Centre Potsdam, GFZ, German Research Centre for Geosciences; Potsdam Germany
4. NASA Goddard Space Flight Center; Greenbelt Maryland USA
5. Space Weather Prediction Center; NOAA; Boulder Colorado USA