Space Weather Follow On-Lagrange 1

Space Weather Follow On-Lagrange 1 satellite

Names| SWFO-L1
Mission type| Space weather
Operator| NOAA
Start of mission
Launch date| 24 September 2025, 11:30 UTC
Rocket| Falcon 9 Block 5
Launch site| Kennedy Space Center, LC-39A
Contractor| SpaceX
Orbital parameters
Reference system| Geocentric orbit
Regime| L1
Instruments
Solar Wind Instrument Suite (SWIS)
Magnetometer
Solar Wind Plasma Sensor (SWiPS)
Compact Coronagraph (CCOR)
Supra-Thermal Ion Sensor (STIS)
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Space Weather Follow On program

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SWFO-L1 (Space Weather Follow On-Lagrange 1) is a spacecraft mission to monitor signs of solar storms, which may pose harm to Earth's telecommunication network. The spacecraft is operated by the National Oceanic and Atmospheric Administration (NOAA). It is to be placed at the Sun–Earth L1 Lagrange point, a location between the Earth and the Sun. This allows SWFO-L1 to continuously watch the solar wind and energetic particles heading for Earth.[1] It was launched on September 24, 2025.[2]

## Contents

* 1 Instruments
* 2 Background
* 3 Project history
* 4 Launch
* 5 See also
* 6 References
* 7 External links

## Instruments

The spacecraft's Solar Wind Instrument Suite (SWIS), which includes three instruments, monitors solar wind, and the Compact Coronagraph (CCOR) monitors the Sun's surroundings to image coronal mass ejection (CME).[3]

## Background

Together with space weather observation capabilities on the Earth-orbiting GOES-U satellite, SWFO-L1 constitutes the space segment of NOAA's Space Weather Follow On (SWFO) program. The aim of the SWFO program is to ensure the robust continuity of space-based measurement of the critical space weather environment.[4][5] All of the spacecraft located in L1 which are currently monitoring CMEs and the solar wind have operated beyond their design lifetime. SWFO-L1's SWIS instruments will replace ACE's and DSCOVR's monitoring of solar wind, energetic particles and the interplanetary magnetic field while CCOR will replace SOHO's LASCO (Large Angle and Spectrometric Coronagraph) imaging of CMEs.[3]

## Project history

In April 2020, Southwest Research Institute (SwRI) was awarded a contract to supply SWFO-L1's magnetometer instrument.[6] The magnetometer instrument sits on the long boom and has been developed at the Institut für Weltraumforschung (Space Research Institute), Graz, Austria.[7]

On 1 July 2020, on behalf of NOAA, NASA awarded the SWFO-L1 Solar Wind Plasma Sensor (SWiPS) contract to Southwest Research Institute (SwRI) in San Antonio, Texas. SwRI was awarded a contract with a total value of US$15.6 million. The period of performance is 76 months. SWFO-L1 will provide NOAA with the continuity of solar wind data and coronal mass ejection imagery, the National Weather Service's highest priority for space weather observations. University of California, Berkeley was awarded US$7.5 million for the development of the Supra-Thermal Ion Sensor (STIS).[8] The SWFO-L1 satellite will collect upstream solar wind data and coronal imagery to support NOAA's mission to monitor and forecast space weather events. NOAA is responsible for the Space Weather Follow On program. NASA is the program's flight system procurement agent, and NASA's Goddard Space Flight Center in Greenbelt, Maryland, is the lead for this acquisition.[9]

On 5 February 2021, NOAA awarded the SWFO-L1 Command and control contract to L3Harris in Melbourne, Florida. The contract has a total value of US$43.8 million, with a five-year performance period. The SWFO-L1 mission is planned to launch as a rideshare with NASA's Interstellar Mapping and Acceleration Probe (IMAP). The contractor is responsible for up to two years of operations support. This will be accomplished by adding the capability to the existing Geostationary Operational Environmental Satellite-R Series Core Ground System.[10]

NOAA manages the contract. In addition to work at L3Harris' facility in Melbourne, the contractor will install equipment at the NOAA Satellite Operations Facility (NSOF) in Suitland, Maryland; NOAA's Wallops Command and Data Acquisition Station (WCDAS) in Wallops, Virginia; and at NOAA's Consolidated Backup Facility (CBU) in Fairmont, West Virginia.[10] The work will allow SWFO-L1 to provide continuity of solar wind and coronal mass ejection imagery data from the L1 point to NOAA's National Weather Service Space Weather Prediction Center in Boulder, Colorado. These data are critical to support monitoring and timely forecasts of space weather events that have the potential to adversely impact elements vital to national security and economic prosperity, including telecommunication and navigation, satellite systems and the power grid. NOAA is responsible for overall implementation and funding of the SWFO program. The program is managed as an integrated NOAA-NASA program, where NASA serves as NOAA's acquisition agent for the space segment and for launch services. NOAA is responsible for the ground segment including the acquisition, development, test and integration of the SWFO Command and control system.[10]

## Launch

File:Three Missions Fully Integrated (54798160955).pngNOAA's SWFO-L1, along with NASA's Interstellar Mapping and Acceleration Probe (IMAP) and Carruthers Geocorona Observatory fully integrated for launch

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.[3] It was launched as a secondary payload on the SpaceX Falcon 9 launch vehicle carrying NASA's Interstellar Mapping and Acceleration Probe (IMAP) spacecraft on 24 September 2025, together with NASA's Carruthers Geocorona Observatory as another rideshare mission.[1][11][12][2]

## See also

* List of objects at Lagrange points

## References

1. ↑ 1.0 1.1 Dobrijevic, Daisy (19 September 2025). "'We must replace this capability now': New NOAA satellite to replace aging space weather sentinels launches Sept. 23" (in en). https://www.space.com/space-exploration/satellites/we-must-replace-this-capability-now-new-noaa-satellite-to-replace-aging-space-weather-sentinels-launches-sept-23.
2. ↑ 2.0 2.1 Clark, Stephen (2025-09-24). "A “cosmic carpool” is traveling to a distant space weather observation post" (in en). https://arstechnica.com/space/2025/09/a-cosmic-carpool-is-traveling-to-a-distant-space-weather-observation-post/.
3. ↑ 3.0 3.1 3.2 Ullman, Richard (26 June 2019). "NOAA's Current and Future Space Weather Observational Architecture". Office of the Federal Coordinator for Meteorology. https://www.ofcm.gov/meetings/swef/2019/presentations/4-4_ullman.pdf. This article incorporates text from this source, which is in the public domain.
4. ↑ Talaat, Elsayed (4 April 2019). "NOAA's Current and Future Space Weather Architecture". Space Weather Prediction Center. https://www.swpc.noaa.gov/sites/default/files/images/u59/05 Elsayed Talaat Official.pdf. This article incorporates text from this source, which is in the public domain.
5. ↑ Onsager, Terry. "NOAA's Space Weather Plans". Space Weather Prediction Center. https://swrc.gsfc.nasa.gov/main/sites/default/files/10thSpaceWeather_Presentations/onsager.pdf. This article incorporates text from this source, which is in the public domain.
6. ↑ "NOAA's Space Weather Follow On-Lagrange 1 Magnetometer Awarded" (Press release). NOAA. 15 April 2020. Retrieved 28 April 2020. This article incorporates text from this source, which is in the public domain.
7. ↑ "Neue Raumsonde mit Technik aus Österreich" (in de). ORF. 2025-09-23. https://orf.at/av/video/onDemandVideoNews51004.
8. ↑ "NASA Awards NOAA's Space Weather Follow On – Supra Thermal Ion Sensor". NASA. https://www.nasa.gov/news-release/nasa-awards-noaas-space-weather-follow-on-supra-thermal-ion-sensor/.
9. ↑ "NASA Awards NOAA's Space Weather Follow On-Lagrange 1 Solar Wind Plasma Sensor". NOAA. 1 July 2020. https://www.nesdis.noaa.gov/content/nasa-awards-noaa’s-space-weather-follow-lagrange-1-solar-wind-plasma-sensor. This article incorporates text from this source, which is in the public domain.
10. ↑ 10.0 10.1 10.2 "NOAA awards SWFO Ground System Command and Control contract". NOAA. 5 February 2021. https://www.nesdis.noaa.gov/content/noaa-awards-swfo-ground-system-command-and-control-contract. This article incorporates text from this source, which is in the public domain.
11. ↑ "NASA Selects Proposals to Further Study the Fundamental Nature of Space" (Press release). NASA. 13 August 2019. Retrieved 9 October 2019. This article incorporates text from this source, which is in the public domain.
12. ↑ "NASA Awards Launch Services Contract for IMAP Mission" (Press release). NASA. 25 September 2020. Retrieved 25 September 2020. This article incorporates text from this source, which is in the public domain.

## External links

* Space Weather Follow On-L1 mission

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Solar space missions

Current|

* ACE
* DSCOVR
* Hinode (Solar-B)
* IRIS
* MinXSS2
* Parker Solar Probe
* SOHO
* SDO
* SOLAR
* STEREO
* Wind

Past|

* Apollo Telescope Mount
* Coronas F (Koronas F)
* EURECA
* ESRO 2B
* Genesis
* GOES 13
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* IMP-8
* Intercosmos 26 (Koronas I)
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* Orbiting Solar Observatory
* OSO 1
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* OSO 3
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* Solwind
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* TRACE
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* Yohkoh (Solar-A)

Planned|

* Solar Orbiter (2020)
* Aditya-L1 (2020)
* PROBA-3 (2021)
* PUNCH (2023)
* TRACERS (2023)
* SWFO-L1 (2024)

Proposed|

* ADAHELI
* EUVST
* Lagrange
* Solar-C
* SETH
* Solar Cruiser
* Sundiver

Cancelled (C) and lost (L)|

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Sun-Earth|

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