NOAA-20

NOAA-20 NOAA-20 is a polar-orbiting environmental satellite operated by the National Oceanic and Atmospheric Administration as part of the Joint Polar Satellite System. It carries advanced radiometric and spectral instruments derived from the Suomi National Polar-orbiting Partnership program and supports global weather forecasting, climate monitoring, and environmental research. The satellite augments observational continuity with predecessors such as NOAA-19 and successors including satellites in the Joint Polar Satellite System constellation.

Mission overview

NOAA-20 was developed to provide continuity of high-quality observations for National Weather Service operational forecasting, National Aeronautics and Space Administration climate records, and international programs like the World Meteorological Organization Global Observing System. Its mission objectives include sounding atmospheric temperature and moisture profiles, measuring Earth radiation budget components, mapping land and ocean surface properties, and monitoring atmospheric composition such as ozone and aerosols to support Intergovernmental Panel on Climate Change assessments. The satellite complements geostationary platforms like GOES-16 and GOES-17 by delivering polar perspectives that enable global, twice-daily coverage used by agencies including European Organisation for the Exploitation of Meteorological Satellites and Japan Meteorological Agency.

Spacecraft and instruments

The spacecraft bus is a derivative of the Suomi NPP platform, built by Ball Aerospace with payload integration by NASA Goddard Space Flight Center. Primary instruments include the Visible Infrared Imaging Radiometer Suite (VIIRS) for high-resolution imaging used in remote sensing of land, ocean, and cryosphere features; the Cross-track Infrared Sounder (CrIS) providing hyperspectral infrared sounding critical to numerical weather prediction centers such as the European Centre for Medium-Range Weather Forecasts; the Advanced Technology Microwave Sounder (ATMS) enabling cloud-penetrating microwave sounding used by UK Met Office assimilation systems; the Ozone Mapping and Profiler Suite (OMPS) for regional and global ozone column and profile retrievals contributing to Montreal Protocol monitoring efforts; and the Clouds and the Earth's Radiant Energy System (CERES) instrument measuring top-of-atmosphere radiative fluxes for climate change studies. Instrument teams and calibration efforts involved organizations including NOAA National Environmental Satellite, Data, and Information Service, NASA Langley Research Center, and University of Wisconsin–Madison.

Launch and orbit

NOAA-20 was launched on 18 November 2017 aboard a Delta II rocket from Vandenberg Air Force Base Space Launch Complex 2. The injection placed the satellite into a sun-synchronous, near-polar orbit with an equator crossing time that aligns with the early-morning orbit used by Suomi NPP. The spacecraft operates in a sun-synchronous orbit approximately 824 kilometers above Earth, providing repeat coverage that enables intercomparison with morning and afternoon polar platforms such as MetOp satellites and supports calibration crossovers with Terra and Aqua. The orbit and local solar time scheduling were coordinated with agencies like NOAA and NASA to optimize global sampling for numerical weather prediction and climatology.

Operations and data products

Operational control and ground segments are managed by NOAA National Environmental Satellite, Data, and Information Service in cooperation with NASA for early mission checkout. Data from VIIRS, CrIS, ATMS, OMPS, and CERES are processed into calibrated radiances, retrievals, and higher-level geophysical products distributed through systems such as NOAA Comprehensive Large Array-data Stewardship System and assimilated by centers including National Centers for Environmental Prediction, European Centre for Medium-Range Weather Forecasts, and Japan Meteorological Agency. Notable product suites include global sea-surface temperature maps used by National Oceanic and Atmospheric Administration operational models, atmospheric sounding profiles ingested by Global Forecast System, ozone column and profile products used by World Ozone and Ultraviolet Radiation Data Centre, and vegetation and fire-detection products employed by United Nations Office for the Coordination of Humanitarian Affairs disaster response. Calibration/validation campaigns have involved Atmospheric Radiation Measurement Climate Research Facility sites, airborne instruments from NASA ER-2 flights, and international partners including NOAA's Cooperative Institute for Research in the Atmosphere.

Scientific contributions and applications

NOAA-20 has contributed to improved weather forecasts through enhanced sounding information for mid- and long-range prediction at centers like ECMWF and NCEP. VIIRS imagery supported cryosphere monitoring by groups such as National Snow and Ice Data Center and informed maritime navigation through improved sea-ice charts used by United States Coast Guard. OMPS ozone data aided long-term trend analysis used by Scientific Assessment of Ozone Depletion contributors. CERES radiative flux measurements contributed to studies published by researchers affiliated with NASA Langley and NOAA Earth System Research Laboratory. ATMS and CrIS synergistic soundings improved hurricane intensity and track forecasts used by National Hurricane Center and tactical decision-making in Federal Emergency Management Agency responses. Cross-disciplinary applications have included air-quality monitoring for Environmental Protection Agency assessments and agricultural monitoring by United States Department of Agriculture programs.

Anomalies and status

During its operational lifetime NOAA-20 experienced routine instrument commissioning anomalies that required software updates and calibration refinements handled by NOAA and NASA teams. Instrument degradation trends have been monitored and mitigated via on-orbit calibration using vicarious sites like Railroad Valley Calibration Site and inter-satellite cross-calibration with Suomi NPP and MetOp-A. As of the latest operational updates, mission managers from NOAA NESDIS continue to operate the satellite, integrate its data into operational assimilations at NCEP and ECMWF, and plan for continuity with follow-on JPSS missions. Category:Earth observation satellites