Joint Polar Satellite System

Joint Polar Satellite System
Name	Joint Polar Satellite System
Mission type	Earth observation
Operator	NOAA / NASA
Manufacturer	Northrop Grumman
Launch site	Vandenberg Space Force Base
Orbit reference	Sun-synchronous orbit
Previous mission	POES

Joint Polar Satellite System. The Joint Polar Satellite System is the United States' next-generation operational polar-orbiting environmental satellite system. It provides critical data for weather forecasting and long-term climate change monitoring, ensuring the continuity of observations begun by the POES and DMSP programs. The system is a collaborative program between the NOAA and NASA, with spacecraft manufactured by Northrop Grumman and launched aboard United Launch Alliance vehicles.

Overview

The program represents a cornerstone of modern meteorology and Earth science, delivering global observations essential for predicting severe weather events like hurricanes, blizzards, and floods. Data from the system feeds directly into the forecast models used by the National Weather Service and major global centers like the European Centre for Medium-Range Weather Forecasts. Its observations support a wide range of environmental monitoring activities beyond daily weather forecasts, including tracking wildfires, sea surface temperatures, vegetation health, and ozone levels. The architecture is designed for sustained, long-term operations to support both immediate public safety and long-term scientific research.

Development and History

The program was established to replace the aging POES constellation and to converge previously separate civilian and military weather satellite efforts following the failed NPOESS initiative. Development was formally initiated by NOAA and NASA in the early 2010s, with the United States Congress providing funding and oversight. The first satellite, JPSS-1 (later renamed NOAA-20), was launched in 2017 from Vandenberg Space Force Base on a Delta II rocket. This launch restored critical observational capabilities and demonstrated the success of the revised program management structure between the agencies. The development of subsequent satellites has involved key industrial partners like Ball Aerospace for instrument fabrication.

Satellites and Instruments

The fleet includes the operational NOAA-20 and NOAA-21 satellites, with the JPSS-3 and JPSS-4 spacecraft in development. Each satellite carries a suite of advanced sensors, including the VIIRS instrument, which provides visible and infrared imagery for monitoring clouds, ocean color, and aerosols. The CrIS instrument delivers high-resolution atmospheric temperature and moisture profiles, while the ATMS provides similar data through cloud cover. The OMPS tracks the health of the ozone layer, and the CERES instrument measures Earth's energy budget. These instruments were developed by teams at NASA's Goddard Space Flight Center and Jet Propulsion Laboratory.

Data and Applications

Observations are disseminated globally in near-real-time to users worldwide, including the World Meteorological Organization and international partners like EUMETSAT. Meteorologists use the data to improve forecasts for events such as nor'easters on the U.S. East Coast and atmospheric rivers affecting California. The data is crucial for aviation safety, maritime navigation, and agriculture. Beyond weather, the long-term data records support climate science, helping researchers at institutions like the University of Wisconsin–Madison and the National Center for Atmospheric Research study trends in Arctic sea ice, global warming, and drought patterns. Applications also extend to monitoring harmful algal blooms and responding to environmental disasters.

International Collaboration

The program is a key component of the World Meteorological Organization's Global Observing System. It operates in a coordinated orbit with the European MetOp satellites, forming a critical morning orbit observation segment. This collaboration with EUMETSAT ensures continuous global coverage every few hours. Data sharing agreements exist with numerous agencies, including JAXA, Environment and Climate Change Canada, and the Korea Meteorological Administration. This international framework, often referred to as the Joint Polar System, maximizes observational coverage and utility for global numerical weather prediction, benefiting entities from the United Kingdom Met Office to the Australian Bureau of Meteorology.

Future of the Program

The upcoming launches of JPSS-3 and JPSS-4 will extend the observational record through the 2030s. Planning is already underway for the follow-on system, often called the Next Generation OPF, to ensure data continuity. Future satellites may incorporate new technologies from NASA's Earth System Observatory or demonstrations from the Space Test Program. Long-term goals include enhancing data assimilation for models at the National Centers for Environmental Prediction and integrating observations with other systems like the GOES series. The program's evolution will continue to support the U.S. National Weather Service and the global scientific community in addressing emerging environmental challenges.

Category:Earth observation satellites of the United States Category:National Oceanic and Atmospheric Administration Category:NASA space probes