1. The Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
2. Department of Climate and Space Sciences and Engineering; University of Michigan; Ann Arbor Michigan USA
3. University Center for Atmospheric Research; University of Colorado Boulder; Boulder Colorado USA
4. Physics Department & Space Science Center; University of New Hampshire; Durham New Hampshire USA
5. Department of Mathematical and Physical Sciences; University of Newcastle; Newcastle New South Wales Australia
6. NASA Goddard Space Flight Center; Greenbelt Maryland USA