![]() 1) 2) 3) 4) 5) 6)Ĭurrently (2014), MTSAT-2 (Himawari-7) is operational, while MTSAT-1R (Himawari-6) is on standby in orbit. JMA (Japan Meteorological Agency) has operated the GMS (Geostationary Meteorological Satellite) and MTSAT (Multifunction Transport Satellite) series of satellites around the 140º east longitude to cover the East Asia and Western Pacific regions since 1978 and makes related contributions to the WMO's World Weather Watch (Unlike the current MTSAT series, which performs both meteorological and aeronautical functions, including air-traffic control communications and position information, Himawari-8 and -9 will have a dedicated meteorological mission. Spacecraft Launch Mission Status Sensor Complement Ground Segment References Himawari-8 and -9 Meteorological Missions The spacecraft uses Ku-band for TT&C (Tracking, Telemetry and Control) transmissions with an uplink rate of 500 bit/s and a downlink data rate of 15.36 kbit/s, while payload data is transmitted in Ka-band, with a data rate of 66 Mbit/s for AHI. The buses house the ADCS (Attitude Determination and Control Subsystem), consisting of a Coarse Sun Sensor, a Star Tracker, an IRU (Inertial Reference Unit), a Gyroscope for attitude sensing and an RWA (Reaction Wheel Assembly), for actuation.Īlso carried aboard the satellites, are the EPS (Electrical Power Subsystem), and the MDHS (Mission Data Handling Subsystem), which connect with the AHI instrument using the SpaceWire interface and process the data from the instrument into telemetry. The spacecraft has dimensions 5.2 x 8.0 x 5.3 m, and a launch mass of approximately 3500 kg. The Himawari-8 and 9 buses were manufactured by MELCO (Mitsubishi Electric Corporation), according to identical specifications. SEDA is capable of measuring the fluxes of protons in the range 15 - 100 MeV and electrons in the range 0.2 - 5 MeV, with a FOV (Field of View) of ☓9.35° for protons and ☗8.3° for electrons.īoth Himawari-8 and 9 operate in geostationary orbits with an altitude of approximately 35,800 km, and a longitude of approximately 140.7° East. Its spatial resolution ranges from 0.5 km to 2.0 km and has full disk coverage in ten minutes. Performance SpecificationsĪHI operates across 16 channels, in the VIS, NIR, SWIR, MWIR and TIR (Visible, Near Infrared, Shortwave Infrared, Medium Wave Infrared, and Thermal Infrared) regions, with central wavelengths 470 nm - 13.30 µm and bandwidths of 20 nm - 0.37 µm. SEDA is an energetic particle spectrometer that aims to measure the radiation the satellites are exposed to in orbit. ![]() SEDA (Space Environment Data Acquisition Monitor).ĪHI is a multipurpose moderate resolution imager, that aims to provide imagery for weather watch, NWP (Numerical Weather Prediction) utilisation and environment monitoring, as well as wind derivation by tracking clouds and water vapour features.Himawari-8 and 9 each carry two instruments: Artist's rendition of the deployed Himawari-8 spacecraft (Image credit: JMA)
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