JMA satellites
The the Japan Meteorological Agency (JMA) operates MTSAT/Himawari satellites and used to operates GMS satellites.
MTSAT satellites
MTSAT satellites are:
- MTSAT-2 (Himawari-7)
- Himawari-8
- Himawari-9
For further reading go to http://www.jma.go.jp/jma/jma-eng/satellite/
Read also the JMA report on the status of current and future satellite system
GMS satellites
