NASA to Launch Solar Storm Satellites with Falcon Heavy

NASA has announced a change in the launch vehicle for its SunRISE (Sun Radio Interferometer Space Experiment) mission, which aims to deploy six small satellites into orbit to study solar storms. The mission, originally slated to launch aboard United Launch Alliance’s (ULA) Vulcan Centaur rocket, will now take off using SpaceX’s Falcon Heavy. This decision was reported by Space.com, citing NASA’s mission update, and further covered by Slashdot’s EditorDavid.

SunRISE is part of NASA’s Explorer Program and will use the six satellites as a radio interferometer to observe radio waves emitted by the Sun. The mission’s objectives include unraveling the mechanisms behind solar storms and improving the accuracy of space weather forecasts. The satellites will operate as a coordinated fleet to monitor solar activities.

Background of the Launch Vehicle Change

Initially, SunRISE was scheduled to launch aboard ULA’s new Vulcan Centaur rocket. However, NASA’s update revealed that the satellite fleet would fly as part of a rideshare mission organized by the U.S. Space Force Space Systems Command (SSC). While NASA’s announcement did not explicitly state the reason for the change, it is believed to be related to technical challenges faced by Vulcan Centaur.

The Vulcan Centaur successfully completed its maiden launch in January 2024 but encountered issues with its solid rocket boosters (SRBs) during two of its subsequent four launches. The most recent incident occurred during the U.S. Space Force mission USSF-87, where SRB problems resurfaced during ascent. Although Vulcan successfully delivered the payload into the designated orbit, the repeated issues led the Space Force to temporarily suspend national security launches using Vulcan until the problems are resolved.

The specific rideshare mission for SunRISE has not yet been disclosed, but the Space Systems Command has already reassigned other launches from Vulcan to SpaceX’s Falcon 9. The decision to use Falcon Heavy for SunRISE appears to be part of this broader shift.

Challenges for Vulcan Centaur

Developed by ULA as the successor to the retiring Atlas V and Delta IV Heavy rockets, Vulcan Centaur features Blue Origin’s BE-4 engines in its first stage and two solid rocket boosters. While its inaugural mission with the Peregrine lunar lander was a success, SRB anomalies occurred during its second and fourth launches.

With a failure rate of 50% across its first four flights, Vulcan’s reliability for national security missions has come into question. The Space Force has indicated that it will not authorize national security payloads to fly aboard Vulcan until the SRB issues are fully resolved. ULA is now under pressure to secure certification and resume commercial launches.

Falcon Heavy’s Track Record and Reliability

In contrast, SpaceX’s Falcon Heavy has demonstrated consistent reliability since its debut in 2018, completing 12 launches, including four for national security payloads. Its most recent national security mission, USSF-52, took place in December 2023, while its latest overall launch successfully deployed the Viasat-3 F3 communications satellite in April 2026.

Falcon Heavy, comprised of three Falcon 9 first stages, boasts a maximum payload capacity of 63.8 tons to low Earth orbit and 26.7 tons to geostationary transfer orbit. Although this capability exceeds the needs of the small satellite fleet in the SunRISE mission, its inclusion in a rideshare mission alongside other payloads makes it a cost-effective and practical choice.

The next Falcon Heavy mission is set to launch NASA’s Nancy Grace Roman Space Telescope, tentatively scheduled for August 30, 2026. SunRISE is slated for a late 2026 launch, with details on its specific rideshare mission expected to be revealed in the coming months.

Objectives and Significance of the SunRISE Mission

SunRISE consists of six CubeSats designed to function as an interferometer to analyze radio emissions from the Sun. By studying phenomena such as solar flares and coronal mass ejections (CMEs), the mission aims to deepen our understanding of these events and enhance the accuracy of space weather prediction models.

Solar storms pose significant risks to Earth’s communication systems, power grids, GPS services, and orbiting satellites. As the number of satellite constellations in low Earth orbit rapidly expands, the risks associated with space weather events are increasing. By combining data from six satellites, SunRISE will provide a detailed visualization of the spatial structure of solar radio emissions, enabling advanced early warning systems.

NASA stated, “The observational data will be used to improve space weather forecast models and develop countermeasures to mitigate the impact of solar events on orbital infrastructure.”

Relationship Between the Space Force and NASA

The SunRISE launch will be conducted as part of a rideshare mission organized by the U.S. Space Force Space Systems Command. The Space Force prioritizes securing launch opportunities for critical national security payloads while utilizing excess capacity for NASA and commercial missions to optimize costs.

The decision to switch from Vulcan to Falcon Heavy reflects the Space Force’s need for reliable launch vehicles amid ongoing SRB issues with Vulcan. This shift underscores the fluid allocation of launch resources between the Department of Defense and NASA.

Editorial Opinion

In the short term, resolving Vulcan’s SRB issues is an urgent priority for ULA. If the Space Force continues to reassign national security launches to SpaceX, ULA may face reduced orders and financial strain. The success of Vulcan’s certification launch in late 2026 could be pivotal for the company’s future.

From a long-term perspective, SpaceX’s role in NASA and Space Force launch procurement is likely to expand. As one of the few heavy-lift rockets capable of accommodating large scientific missions, Falcon Heavy may remain in high demand through the late 2020s, especially given uncertainties surrounding Vulcan’s certification timeline and the operational readiness of SpaceX’s Starship. However, this could lead to increased market concentration, raising concerns about reduced competition in the launch industry.

The editorial team believes the key points to monitor are the progress in resolving Vulcan’s SRB issues, the potential tightening of the Space Force’s certification process, and whether the change in launch vehicles will result in delays for the SunRISE mission.

References

• “NASA Replaces ULA’s Vulcan Centaur With SpaceX Falcon Heavy For Solar Storm Research”, by EditorDavid — Slashdot, 2026-07-26T21:46:00.000Z (ARR)
• Source URL: https://science.slashdot.org/story/26/07/26/2144224/nasa-replaces-ulas-vulcan-centaur-with-spacex-falcon-heavy-for-solar-storm-research?utm_source=rss1.0mainlinkanon&utm_medium=feed