1. Space Science Center University of New Hampshire Durham New Hampshire USA
2. Now at The Johns Hopkins University Applied Physics Laboratory Laurel Maryland USA
3. Center for Geospace Studies SRI International Menlo Park California USA
4. Birkeland Centre for Space Science, Department of Physics and Technology University of Bergen Bergen Norway
5. Department of Arctic Geophysics University Centre in Svalbard Longyearbyen Norway
6. Department of Physical Sciences Embry‐Riddle Aeronautical University Daytona Beach Florida USA
7. Department of Physics and Astronomy Dartmouth College Hanover New Hampshire USA