1. Department of Earth and Planetary Science Kyushu University Fukuoka Japan
2. NASA Goddard Space Flight Center Greenbelt MD USA
3. Physics Department Catholic University of America Washington, DC USA
4. National Institute of Polar Research Tokyo Japan
5. Department of Polar Science The Graduate University for Advanced Studies, SOKENDAI Tokyo Japan
6. Forschungszentrum Jülich Jülich Germany
7. NorthWest Research Associates Boulder CO USA