1. Haystack ObservatoryMassachusetts Institute of Technology Westford Massachusetts USA
2. Applied Physics LaboratoryThe Johns Hopkins University Baltimore Maryland USA
3. High Altitude ObservatoryNational Center for Atmospheric Research Boulder Colorado USA
4. Air Force Research Laboratory Wright‐Patterson Ohio USA
5. Arecibo ObservatorySRI International Menlo Park, California USA
6. Computational Physics, Inc. Springfield Virginia USA