missions

FY-4B

Compiled from public sources on 2026-06-14. Not independently verified by China Meteorological Administration.

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Second FY-4 geostationary meteorological satellite and first operational unit of the series, carrying AGRI, GIIRS-2, and GHI meteorological payloads.

FY-4B (Fengyun-4B) is the second satellite in China's FY-4 third-generation geostationary meteorological series and the first designated as an operational unit of the series, operated by the China Meteorological Administration. The satellite launched in June 2021 and is currently stationed at 105 degrees East following relocation from 133 degrees East in February 2024.^[1]^[2]

The Earth-observation sensor stack includes three instruments. The Advanced Geostationary Radiation Imager (AGRI) provides multi-channel visible and infrared imagery for atmospheric motion vectors, sea surface temperature, precipitation estimates, and thermal anomaly detection.^[3] The Geostationary Interferometric Infrared Sounder-2 (GIIRS-2) is an upgraded sounder supporting atmospheric temperature and humidity profiling and tropospheric trace-gas column retrieval.^[4] The Geostationary High-speed Imager (GHI) delivers rapid-cadence imaging for sub-minute atmospheric phenomena monitoring.^[5]

Ancillary payloads include a data collection system (DCS) and a space-environment particle monitoring package (SEP). Compared to FY-4A, the FY-4B introduces the GHI rapid-scan imager and an upgraded sounder as its main capability enhancements.^[6]

Where this fits, supply chain

Compositional position

this ——— FY-4B Advanced Geostationary Radiation Imager payload

this ——— Geostationary Interferometric Infrared Sounder-2 payload

this ——— Geostationary High-speed Imager payload

this ——— FY-4B Data Collection Service payload

this ——— FY-4B Space Environment Package payload

this ——— weather-nowcasting related-topic

this ——— Atmospheric Wind Observation related-topic

this ——— Atmospheric profiling related-topic

this ——— Sea surface temperature related-topic

this ——— precipitation related-topic

this ——— Wildfire related-topic

this ——— Air quality related-topic

Atmospheric motion vectors (AMV) → demonstrated FY-4B Advanced Geostationary Radiation Imager

Sea-surface temperature retrieval → demonstrated FY-4B Advanced Geostationary Radiation Imager

Satellite precipitation retrieval → demonstrated FY-4B Advanced Geostationary Radiation Imager

Thermal anomaly detection → demonstrated FY-4B Advanced Geostationary Radiation Imager

Land-surface temperature - emissivity retrieval → demonstrated FY-4B Advanced Geostationary Radiation Imager

Multi-temporal burned-area mapping → demonstrated FY-4B Advanced Geostationary Radiation Imager

Atmospheric limb sounding → demonstrated Geostationary Interferometric Infrared Sounder-2

Tropospheric column mapping (NO2/SO2) → demonstrated Geostationary Interferometric Infrared Sounder-2

Atmospheric motion vectors (AMV) → demonstrated Geostationary High-speed Imager

Sources

[1]NSMC FY-4B satellite pageagency doc2026-06-14
[2]WMO OSCAR satellite record: FY-4Bagency doc2026-06-14
[3]CEOS MIM FY-4B mission summarycommunity2026-06-14
[4]Introduction of FY-4B instruments and post-launch calibration resultsagency doc2026-06-14
[5]WMO OSCAR instrument record: Advanced Geostationary Radiation Imageragency doc2026-06-14
[6]WMO OSCAR instrument record: Geostationary Interferometric Infrared Sounder-2agency doc2026-06-14
[7]WMO OSCAR instrument record: Geostationary High-speed Imageragency doc2026-06-14

Cite https://eo-atlas.org/missions/fy-4b Markdown twin → Field definitions →