The GOES system uses geosynchronous equatorial satellites that, since the launch of SMS-1 in 1974, have been a basic element of U.S. weather monitoring and forecasting.
The procurement, design, and manufacture of GOES satellites is overseen by NASA.
NOAA is the official provider of both GOES terrestrial data and GOES space weather data. Data can also be accessed using the SPEDAS software.
History
The first GOES satellite, GOES-1, was launched in October 1975. Two more followed, launching almost two minutes short of a year apart, on 16 June 1977 and 1978 respectively. Prior to the GOES satellites two Synchronous Meteorological Satellites (SMS) satellites had been launched; SMS-1 in May 1974, and SMS-2 in February 1975. The SMS-derived satellites were spin-stabilized spacecraft, which provided imagery through a Visible and Infrared Spin Scan Radiometer, or VISSR. The first three GOES satellites used a Philco-Ford bus developed for the earlier Synchronous Meteorological Satellites (SMS) generation.[1]
Following the three SMS GOES spacecraft, five satellites were procured from Hughes, which became the first generation GOES satellites. Four of these reached orbit, with GOES-G being lost in a launch failure.[2]
First generation GOES satellite
The next five GOES satellites were constructed by Space Systems/Loral, under contract to NASA.[3] The imager and sounder instruments were produced by ITT Aerospace/Communication Division. GOES-8 and -9 were designed to operate for three years, while -10, -11 and -12 have expected lifespans of five years. GOES-11 and -12 were launched carrying enough fuel for ten years of operation, in the event that they survived beyond their expected lifespan.
A contract to develop four third-generation GOES satellites was awarded to Hughes Corporation, with the satellites scheduled for launch on Delta III rockets between 2002 and 2010.[4] After a merger with Hughes, Boeing took over the development contracts, with launches transferred to the Delta IV, following the Delta III's retirement. The contract for the fourth satellite, GOES-Q, was later cancelled.[5] The first third-generation satellite, GOES-13, was launched in May 2006, originally serving as an on-orbit backup.[6] However, in April 2010, GOES-12 was moved to South America coverage and GOES-13 was moved to the GOES-East role.[7] Third generation satellites have an expected lifespan of seven years, but will carry excess fuel to allow them to operate for longer if possible, as with the last two-second generation satellites.
The fourth-generation satellites, the GOES-R series,[9] were built by Lockheed Martin using the A2100 satellite bus. The GOES-R series is a four-satellite program (GOES-R, -S, -T and -U) intended to extend the availability of the operational GOES satellite system through 2036.[10] GOES-R launched on 19 November 2016.[9] It was renamed GOES-16 upon reaching orbit. Second of the series GOES-S, was launched on 1 March 2018. It was renamed GOES-17 upon reaching orbit.
Satellites
Operationally available
Four GOES satellites are available for operational use.
GOES-14 is in storage at 105° W. The launch of this satellite, which was designated GOES-O before orbiting, was delayed several times.[11][12] It was launched successfully on 27 June 2009 from Space Launch Complex 37, on a Delta IV Medium rocket,[13] a Delta IV M+ (4,2). It underwent Post-Launch Testing until December 2009 and then was placed in on-orbit storage.[14] This satellite is a part of the GOES-N Series. GOES-14 has been and will be activated should another GOES satellite suffer a problem or be decommissioned.[15] It was temporarily designated GOES-East because of technical difficulties with GOES-13 and moved towards the GOES-East location. After resolution of those problems, GOES-14 was returned to storage.[16]
GOES-15, which was designated GOES-P before orbiting, was launched successfully on 4 March 2010,[17][18] on a Delta IV M+ (4,2). From 2011 to 2018, it occupied the GOES-West position at 135°W over the Pacific Ocean.[19] It moved eastward to 128° W beginning on 29 October 2018 in order to make room for GOES-17, which took over the GOES-West position on 10 December 2018.[20] GOES-15 operated in tandem with GOES-17 for some time, but was retired in early 2020 and moved to a parking orbit.[21][22] GOES-15 was temporarily returned to operational status in August 2020 to fill a gap in the sensor capabilities of GOES-17 due to a hardware issue.
GOES-16 occupies the GOES-East position at 75° W. This satellite, which was designated GOES-R before orbiting, was launched by an Atlas V 541 rocket from Space Launch Complex 41 at Cape Canaveral Air Force Station in Florida on 19 November 2016.[23] It underwent Post-Launch Testing through early 2017 before replacing GOES-13 as GOES-East.
GOES-17 occupies the GOES-West position at 137.2° W. The satellite, designated as GOES-S before orbiting, was launched by an Atlas V 541 rocket from Space Launch Complex 41 on 1 March 2018.[24] Following post-launch testing and troubleshooting of a problem in its imager, the satellite was declared operational in February 2019.
Inactive or repurposed
Several GOES satellites are still in orbit but are either inactive or have been re-purposed.
Although GOES-3 ceased to be used for weather operations in 1989, it spent over 20 years as a critical part of communications between the U.S. and Amundsen–Scott South Pole Station before being decommissioned in 2016.[25] Geostationary satellites expend fuel to keep themselves stationary over the equator, and thus cannot normally ordinarily be seen from the poles. When that fuel is depleted, solar and lunar perturbations increase the satellite's inclination so that its ground track begins to describe an analemma (a figure-8 in the north–south direction). This usually ends the satellite's primary mission. However, when the inclination is high enough the satellite may begin to rise above the polar horizons at the extremes of the figure-8, as was the case for GOES-3. A nine-meter dish was constructed at the station, and communication with the satellite could be obtained for about five hours per day. Data rates were around 2.048 megabytes/second (bi-directional) under optimum conditions.
GOES-8, which was designated GOES-I before orbiting, was the GOES-East satellite when it was in operation. It is in a parking orbit and is drifting westerly at a rate of about 4° daily.[26] It was decommissioned on 1 April 2003 and deactivated on 5 May 2004 after the failure of its propulsion system.[27]
GOES-10, which was designated GOES-K before orbiting, was decommissioned on 2 December 2009 and was boosted to a graveyard orbit. It no longer had the fuel for required maneuvers to keep it on station.[28]
GOES-11, which was designated GOES-L before orbiting, had a partial failure on 6 December 2011. It was decommissioned on 16 December 2011 and boosted into a graveyard orbit.
GOES-12, which was designated GOES-M before orbiting, was decommissioned on 16 August 2013 and boosted into a graveyard orbit.[29]
GOES-13, which was designated GOES-N before orbiting, was decommissioned on 3 January 2018 and boosted into storage orbit. It was transferred to the U.S. Space Force and positioned at 61.5ºE under the new name EWS-G1. Following three years of monitoring the Indian Ocean, EWS-G1 was retired on 31 October 2023 when EWS-G2 (formerly GOES-15) took over.
GOES-15, which was designated GOES-P before orbiting, was launched successfully on 4 March 2010.[17][18] From 2011 to 2018, it occupied the GOES-West position at 135°W over the Pacific Ocean.[19] It moved eastward to 128° W beginning on 29 October 2018 in order to make room for GOES-17, which took over the GOES-West position on 10 December 2018.[20] GOES-15 operated in tandem with GOES-17 for some time, but was retired in early 2020 and moved to a parking orbit.[21][22] GOES-15 was temporarily returned to operational status in August 2020 to fill a gap in the sensor capabilities of GOES-17 due to a hardware issue. Like GOES-13, GOES-15 was then transferred to the U.S. Space Force and renamed EWS-G2 to monitor the Indian Ocean until approximately 2030.
Coverage map of GOES-11 and GOES-12 when active (2007).
GOES-12 visible light image.
GOES-12 water vapor image.
Purpose
GOES data relay pattern.
Designed to operate in geostationary orbit35,790 kilometres (22,240mi) above the Earth, the GOES spacecraft continuously view the continental United States, the Pacific and Atlantic Oceans, Central America, South America, and southern Canada. The three-axis, body-stabilized design enables the sensors to "stare" at the Earth and thus more frequently image clouds, monitor the Earth's surface temperature and water vapour fields, and sound the atmosphere for its vertical thermal and vapor structures. The evolution of atmospheric phenomena can be followed, ensuring real-time coverage of meteorological events such as severe local storms and tropical cyclones. The importance of this capability was proven during hurricanes Hugo (1989) and Andrew (1992).
The GOES spacecraft also enhance operational services and improve support for atmospheric science research, numerical weather prediction models, and environmental sensor design and development.
Satellite data is broadcast on the L-band, and received at the NOAA Command and Data Acquisition ground station at Wallops Island, Virginia[30] from which it is disseminated to users. Additionally, anyone may receive data directly from the satellites by utilizing a small dish, and processing the data with special software.[31]
The GOES satellites are controlled from the Satellite Operations Control Center in Suitland, Maryland. During significant weather or other events, the normal schedules can be altered to provide the coverage requested by the NWS and other agencies.
Space Weather -- March 2012.
GOES-12 and above also have provided a platform for the Solar X-Ray Imager (SXI) and space environment monitoring (SEM) instruments.
The SXI provides high-cadence monitoring of large scale solar structures to support the Space Environment Services Center's (SESC) mission. The SXI unit on GOES-13, however, was damaged by a solar flare in 2006. The SESC, as the nation's "space weather" service, receives, monitors, and interprets a wide variety of solar-terrestrial data. It also issues reports, alerts, and forecasts for special events such as solar flares or geomagnetic storms. This information is important to the operation of military and civilian radio wave and satellite communication and navigation systems. The information also is important to electric power networks, the missions of geophysical explorers, Space Station astronauts, high-altitude aviators, and scientific researchers.
The SEM measures the effect of the Sun on the near-Earth solar-terrestrial electromagnetic environment, providing real-time data to the SESC.
Payload
The main mission of a GOES satellite is carried out by the primary payload instruments, which are the Imager and the Sounder. The Imager is a multichannel instrument that senses infrared radiant energy and visible reflected solar energy from the Earth's surface and atmosphere. The Sounder provides data for vertical atmospheric temperature and moisture profiles, surface and cloud top temperature, and ozone distribution.
GOES also offers the Data Collection System, a ground-based meteorological platform satellite data collection and relay service.[33] Other instruments on board the spacecraft are the SEM set, which consists of a magnetometer, an X-ray sensor, a high energy proton and alpha particle detector, and an energetic particles sensor.
The GOES-N series (GOES-13 through GOES-15) spacecraft also have a sun-pointed extreme ultraviolet sensor.
The proposed instrument package for the GOES-R series initially included the following:[34][35]
Advanced Baseline Imager (ABI)
Hyperspectral Environmental Suite (HES)
Space Environment In-Situ Suite (SEISS), which includes two Magnetospheric Particle Sensors (MPS-HI and MPS-LO), an Energetic Heavy Ion Sensor, and a Solar and Galactic Proton Sensor
Solar Imaging Suite, which includes the Solar Ultraviolet Imager (SUVI), the Solar X-Ray Sensor (XRS), and the Extreme Ultraviolet Sensor (EUVS)
Before being launched, GOES satellites are designated by letters (A, B, C, etc.). Once a GOES satellite is launched successfully, it is redesignated with a number (1, 2, 3, etc.). So, GOES-A to GOES-F became GOES-1 to GOES-6. Because GOES-G was a launch failure, it never received a number. GOES-H to GOES-R became GOES-7 to GOES-16 (skipping GOES-Q, which was not built).
Once operational, the different locations used by the satellites are given a name corresponding to the regions they cover. These are GOES-East and GOES-West, which watch the eastern and western halves of the U.S., respectively. GOES-East is occupied by GOES-16,[36] while GOES-West is occupied by GOES-17. The -East/-West designation is used more frequently than the satellite's number designation. GOES-IO (Indian Ocean), a new designation revealed in early May 2020, is currently occupied by GOES-13 (DOD-1).[37]
There was also a GOES-South position, which is meant to provide dedicated coverage of South America. Before the GOES-R series became operational, unless a satellite was dedicated to this continent, imagery of South America was updated every 3 hours instead of every 30 minutes.[38] The GOES-South station was usually assigned to older satellites whose North American operations have been taken over by new satellites. For example, GOES-10 was moved from the GOES-West position to GOES-South after it was replaced in the -West station by GOES-11. When GOES-10 was decommissioned on 1 December 2009, GOES-South was taken over by GOES-12. Since the retirement of GOES-12 on 16 August 2013, the GOES-South station has been unoccupied. GOES-16 has since made the need for a dedicated GOES-South satellite obsolete; as of 2019, the satellite produces full disk images every 10 minutes.
Development of GOES-R Series
In September 2006, NOAA reduced the planned number of GOES-R satellites from four to two because of cost overrun concerns. The planned delivery schedule was also slowed down to reduce costs. The expected cost of the series is $7.69 billion, a $670 million increase from the prior $7 billion estimate.[39]
The contract for constructing the satellites and manufacturing the magnetometer, SUVI, and GLM was awarded to Lockheed Martin. This award was challenged by losing bidder Boeing;[40] however, the protest was subsequently dismissed.
The ABI instrument was delivered by L3Harris (formerly ITT Exelis).[41] The SEISS was delivered by Assurance Technology Corporation.
The contract for the ground system, including data processing, was awarded to a team led by the Weather Systems division of L3Harris, including subcontracts to Boeing, Atmospheric and Environmental Research (AER), Honeywell, Carr Astronautics, Wyle Laboratories, and Ares.[43]
GOES spacecraft have been manufactured by Boeing (GOES-D through -H and GOES-N through -P) and Space Systems/Loral (GOES-A through -C and GOES-I through -M). The GOES-I series (I-M) and the GOES-N series (N-P) are documented in the "GOES I–M Databook" and the "GOES-N Series Databook", respectively. The GOES-R series was built by Lockheed Martin with the first and second in the series, GOES-16 and -17, declared operational in early 2019.[44] Following an equipment failure on GOES-17, it was replaced by GOES-18 in January 2023, with the former taken out of service to act as a backup.[45]
Boeing would have built and launched GOES-Q only if GOES-O or GOES-P had failed to be delivered on-orbit in good working order.
The first image obtained from the GOES-1 satellite, 25 October 1975, 1645 UTC.
GOES-1, launched on 16 October 1975, decommissioned on 7 March 1985
GOES-2, launched on 16 June 1977, decommissioned on 5 May 2001, before which a comsat for the South Pole, Peacesat
GOES-3, launched on 16 June 1978, decommissioned on 29 June 2016, before which a comsat for the South Pole, Peacesat
GOES-4, launched on 9 September 1980, decommissioned on 9 October 1988
GOES-5, launched on 22 May 1981, decommissioned 18 July 1990
GOES-6, launched on 28 April 1983, decommissioned on 19 May 1992
GOES-G, launched on 3 May 1986, failed to achieve orbit
GOES-7, launched on 26 February 1987, decommissioned on 12 April 2012, before which a comsat for Peacesat[46]
GOES-8, launched on 13 April 1994, decommissioned on 5 May 2004
GOES-9, launched on 23 May 1995, decommissioned on 15 June 2007
GOES-10, launched on 25 April 1997, decommissioned on 2 December 2009[47]
GOES-11, launched on 3 May 2000, decommissioned on 16 December 2011
GOES-12, launched on 23 July 2001, decommissioned on 16 August 2013, before which provided coverage for South America[48]
GOES-13, launched on 24 May 2006, decommissioned on 31 October 2023, before which used by the U.S. Space Force for the Indian Ocean as EWS-G1
GOES-14, launched on 27 June 2009, in standby, located at 105° W
GOES-15, launched on 4 March 2010, decommissioned in late 2018, used from 2020 in tandem with GOES-17, then operational for Indian Ocean since November 2023 as EWS-G2[49]
GOES-16, launched on 19 November 2016, in operation as GOES-East since 18 December 2017[50]
GOES-17, launched on 1 March 2018,[51]in operation as GOES-West from 12 February 2019 to 3 January 2023, in stand-by[52]
GOES-18, launched on 1 March 2022, in operation as GOES-West from 3 January 2023[45]
GOES-U, launched on 25 June 2024. Will become GOES East after commissioning.[53]
A weather satellite or meteorological satellite is a type of Earth observation satellite that is primarily used to monitor the weather and climate of the Earth. Satellites are mainly of two types: polar orbiting or geostationary.
NOAA-17, also known as NOAA-M before launch, was an operational, polar orbiting, weather satellite series operated by the National Environmental Satellite Service (NESS) of the National Oceanic and Atmospheric Administration (NOAA). NOAA-17 also continued the series of Advanced TIROS-N (ATN) spacecraft begun with the launch of NOAA-8 (NOAA-E) in 1983 but with additional new and improved instrumentation over the NOAA A-L series and a new launch vehicle.
NOAA-16, also known as NOAA-L before launch, was an operational, polar orbiting, weather satellite series operated by the National Environmental Satellite Service (NESS) of the National Oceanic and Atmospheric Administration (NOAA). NOAA-16 continued the series of Advanced TIROS-N (ATN) spacecraft that began with the launch of NOAA-8 (NOAA-E) in 1983; but it had additional new and improved instrumentation over the NOAA A-K series and a new launch vehicle. It was launched on 21 September 2000 and, following an unknown anomaly, it was decommissioned on 9 June 2014. In November 2015 it broke up in orbit, creating more than 200 pieces of debris.
NOAA-15, also known as NOAA-K before launch, is an operational, polar-orbiting of the NASA-provided Television Infrared Observation Satellite (TIROS) series of weather forecasting satellite operated by National Oceanic and Atmospheric Administration (NOAA). NOAA-15 was the latest in the Advanced TIROS-N (ATN) series. It provided support to environmental monitoring by complementing the NOAA/NESS Geostationary Operational Environmental Satellite program (GOES).
GOES-1, designated GOES-A and SMS-C prior to entering service, was a weather satellite, developed by the NASA, operated by the United States National Oceanic and Atmospheric Administration (NOAA). It was the first Geostationary Operational Environmental Satellite (GOES) to be launched.
GOES-14, known as GOES-O prior to reaching its operational orbit, is an American weather satellite, which is part of the US National Oceanic and Atmospheric Administration (NOAA)'s Geostationary Operational Environmental Satellite (GOES) system. The spacecraft was built by Boeing and is based on the BSS-601 bus. It is the second of three GOES satellites to use the BSS-601 bus, after GOES-13, which was launched in May 2006.
EWS-G1 is a weather satellite of the U.S. Space Force, formerly GOES-13 and part of the National Oceanic and Atmospheric Administration's Geostationary Operational Environmental Satellite system. On 14 April 2010, GOES-13 became the operational weather satellite for GOES-East. It was replaced by GOES-16 on 18 December 2017 and on 8 January 2018 its instruments were shut off and it began its three-week drift to an on-orbit storage location at 60.0° West longitude, arriving on 31 January 2018. It remained there as a backup satellite in case one of the operational GOES satellites had a problem until early July 2019, when it started to drift westward and was being transferred to the U.S. Air Force, and then the U.S. Space Force.
GOES-12, known as GOES-M before becoming operational, is an American weather satellite, which is part of the US National Oceanic and Atmospheric Administration's Geostationary Operational Environmental Satellite system. It was launched on July 23, 2001, and spent its first 21 months in space as an on-orbit spare. From April 2003, the satellite took over the GOES-East position, providing coverage of the eastern half of the continental United States. In April 2010, GOES-East operations were taken over by GOES-13, and GOES-12 transitioned to the GOES-South location to devote time to South American imagery. It remained at this post until it was decommissioned on August 16, 2013 and subsequently boosted to a graveyard orbit.
GOES-10, known as GOES-K before becoming operational, was an American weather satellite, which formed part of the US National Oceanic and Atmospheric Administration's Geostationary Operational Environmental Satellite system. It was launched in 1997, and after completing operations as part of the main GOES system, it was kept online as a backup spacecraft until December 2009, providing coverage of South America as GOES-SOUTH, and being used to assist with hurricane predictions for North America. It was retired and maneuvered to a graveyard orbit on 1 December 2009.
GOES-9, known as GOES-J before becoming operational, was an American weather satellite, which formed part of the U.S. National Oceanic and Atmospheric Administration's Geostationary Operational Environmental Satellite system. It was launched in 1995, and operated until 2007 when it was retired and boosted to a graveyard orbit. At launch, the satellite had a mass of 2,105 kilograms (4,641 lb), and an expected operational lifespan of three years. It was built by Space Systems/Loral, based on the LS-1300 satellite bus, and was the second of five GOES-I series satellites to be launched.
GOES-8, known as GOES-I before becoming operational, was an American weather satellite, which formed part of the US National Oceanic and Atmospheric Administration's Geostationary Operational Environmental Satellite system. It was launched in 1994, and operated until 2004 when it was retired and boosted to a graveyard orbit. At launch, the satellite had a mass of 2,105 kilograms (4,641 lb), and an expected operational lifespan of three or five years. It was built by Space Systems/Loral, based on the LS-1300 satellite bus, and was the first of five GOES-I series satellites to be launched.
GOES-7, known as GOES-H before becoming operational, is an American satellite. It was originally built as a weather satellite, and formed part of the US National Oceanic and Atmospheric Administration's Geostationary Operational Environmental Satellite system. Originally built as a ground spare, GOES-H was launched in 1987 due to delays with the next series of satellites. It was operated by NOAA until 1999, before being leased to Peacesat, who use it as a communications satellite. As of 2009, it was operational over the Pacific Ocean, providing communications for the Pacific Islands. On April 12, 2012, the spacecraft was finally decommissioned and moved to a graveyard orbit.
GOES-2, known as GOES-B before becoming operational, was a geostationary weather satellite which was operated by the United States National Oceanic and Atmospheric Administration as part of the Geostationary Operational Environmental Satellite system. GOES-2 was built by Ford Aerospace, and was based on the satellite bus developed for the Synchronous Meteorological Satellite programme. At launch it had a mass of 295 kilograms (650 lb). It was positioned in geostationary orbit, from where it was used for weather forecasting in the United States. Following its retirement as a weather satellite, it was used as a communications satellite until its final decommissioning in 2001.
GOES-3, known as GOES-C before becoming operational, was an American geostationary weather and communications satellite. It was originally built for the National Oceanic and Atmospheric Administration as part of the Geostationary Operational Environmental Satellite system, and was launched in June 1978. It was positioned in geostationary orbit, from where it was initially used for weather forecasting in the United States. After ceasing to function as a weather satellite in 1989, it was used as a communications satellite, and spent over thirty-eight years in operation. GOES-3 was decommissioned 29 June 2016 at the Center for Southeastern Tropical Advanced Remote Sensing facility in Miami, Florida.
EWS-G2 is a weather satellite of the U.S. Space Force, formerly GOES-15. The spacecraft was constructed by Boeing, and is the last of three GOES satellites to be based on the BSS-601 bus. It was launched in 2010, while the other BSS-601 GOES satellites—GOES-13 and GOES-14—were launched in May 2006 and June 2009 respectively. It was the sixteenth GOES satellite to be launched.
The Joint Polar Satellite System (JPSS) is the latest generation of U.S. polar-orbiting, non-geosynchronous, environmental satellites. JPSS will provide the global environmental data used in numerical weather prediction models for forecasts, and scientific data used for climate monitoring. JPSS will aid in fulfilling the mission of the U.S. National Oceanic and Atmospheric Administration (NOAA), an agency of the Department of Commerce. Data and imagery obtained from the JPSS will increase timeliness and accuracy of public warnings and forecasts of climate and weather events, thus reducing the potential loss of human life and property and advancing the national economy. The JPSS is developed by the National Aeronautics and Space Administration (NASA) for the National Oceanic and Atmospheric Administration (NOAA), who is responsible for operation of JPSS. Three to five satellites are planned for the JPSS constellation of satellites. JPSS satellites will be flown, and the scientific data from JPSS will be processed, by the JPSS – Common Ground System (JPSS-CGS).
GOES-16, formerly known as GOES-R before reaching geostationary orbit, is the first of the GOES-R series of Geostationary Operational Environmental Satellites (GOES) operated by NASA and the National Oceanic and Atmospheric Administration (NOAA). GOES-16 serves as the operational geostationary weather satellite in the GOES East position at 75.2°W, providing a view centered on the Americas. GOES-16 provides high spatial and temporal resolution imagery of the Earth through 16 spectral bands at visible and infrared wavelengths using its Advanced Baseline Imager (ABI). GOES-16's Geostationary Lightning Mapper (GLM) is the first operational lightning mapper flown in geostationary orbit. The spacecraft also includes four other scientific instruments for monitoring space weather and the Sun.
GOES-17 is an environmental satellite operated by the National Oceanic and Atmospheric Administration (NOAA). The satellite is second in the four-satellite GOES-R series. GOES-17 supports the Geostationary Operational Environmental Satellite (GOES) system, providing multi-spectral imaging for weather forecasts and meteorological and environmental research. The satellite was built by Lockheed Martin, based on the A2100A platform, and expected to have a useful life of 15 years. GOES-17 is intended to deliver high-resolution visible and infrared imagery and lightning observations of more than half the globe.
GOES-19 is a weather satellite, the fourth and last of the GOES-R series of satellites operated by the National Oceanic and Atmospheric Administration (NOAA). The GOES-R series will extend the availability of the Geostationary Operational Environmental Satellite (GOES) system until 2036. The satellite is built by Lockheed Martin, based on the A2100 platform.
Space Weather Follow On-Lagrange 1 (SWFO-L1) is a future spacecraft mission planned to monitor signs of solar storms, which may pose harm to Earth's telecommunication network. The spacecraft will be operated by the National Oceanic and Atmospheric Administration (NOAA), with launch scheduled for 29 April 2025. It is planned to be placed at the Sun–Earth L1 Lagrange point, a location between the Earth and the Sun. This will allow SWFO-L1 to continuously watch the solar wind and energetic particles heading for Earth. SWFO-L1 is an ESPA Class Spacecraft, sized for launch on an Evolved Expendable Launch Vehicle Secondary Payload Adapter (ESPA) Grande ring in addition to the rocket's primary payload. The spacecraft's Solar Wind Instrument Suite (SWIS) which includes three instruments will monitor solar wind, and the Compact Coronagraph (CCOR) will monitor the Sun's surroundings to image coronal mass ejection (CME). A CME is a large outburst of plasma sent from the Sun towards interplanetary space.
↑ "GOES-R Spacecraft". Geostationary Operational Environmental Satellite Program (GOES). Goddard Space Flight Center. Archived from the original on 28 October 2014. Retrieved 12 August 2011.
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