1. The University of Tokyo Tokyo Japan
2. Japan Aerospace Exploration Agency Tokyo Japan
3. National Astronomical Observatory of Japan Tokyo Japan
4. Nagoya University Nagoya Japan
5. National Institute of Polar Research Tokyo Japan
6. The University of Electro‐Communications Tokyo Japan
7. Tohoku University Sendai Japan
8. Polar Geophysical Institute Murmansk Russia
9. Osaka University Toyonaka Japan
10. University of Colorado at Boulder Boulder CO USA