Solar-powered spacecraft, armed with solar sails, may provide timely alerts about impending atmospheric hazards that could impact Earth's technologies, offering an advanced weather warning system.
Announcing the Next-Generation Space Weather Defence System: SWIFT
The Space Weather Investigation Frontier (SWIFT) is a groundbreaking satellite constellation that aims to revolutionise the prediction and defence against potentially harmful space weather events. By employing advanced solar sail propulsion technology, SWIFT will be able to maintain unique and strategic positions in space, including beyond the L1 Lagrange point, which are otherwise inaccessible to traditional satellites.
Space weather refers to variations in the environment between the Sun and Earth. These variations can pose a significant threat to our planet and its orbiting satellites. Extreme space weather events, such as coronal mass ejections (CMEs), can severely impact satellites, power grids, aviation, and even astronaut safety on Earth and in space.
SWIFT's key improvements include extending the warning time for Earth-bound solar events from the current 40 minutes to up to 60 minutes or more, creating a multi-point observational network (constellation) for greater accuracy in forecasting the intensity and trajectory of solar storms, and detailed mapping of CMEs' shape, speed, and magnetic structure before they hit Earth.
The constellation will consist of a solar sail-powered “hub” beyond L1 and three smaller satellites at L1. This setup allows scientists to track how solar winds and magnetic fields evolve as they approach Earth, offering greater precision in predicting the impact and timing of solar storms.
The use of solar sails enables fuel-less, long-duration station-keeping closer to the Sun than conventional satellites, maintaining optimal positions for over a decade, which is vital for continuous, reliable space weather monitoring.
The telecommunications, electric grids, aviation, and space exploration industries are all vulnerable to space weather. Commercial interests are also involved in space exploration, focusing on tourism, satellite networks, and resource extraction from the Moon and nearby asteroids.
SWIFT's development is being led by a heliophysicist and space weather expert. NASA has previously launched solar sail missions, including the NanoSail-D2, IKAROS, LightSail, and the advanced composite solar sail system.
The SWIFT team's solar sail demonstration mission, Solar Cruiser, will be equipped with a much larger sail and is scheduled to launch as early as 2029. If successful, Solar Cruiser will pave the way for SWIFT's constellation of four satellites, including one satellite equipped with sail propulsion and three smaller satellites with chemical propulsion.
Each of the four satellites can observe the solar wind from different locations, helping scientists better predict how it may evolve before reaching Earth. The satellites will be indefinitely parked at and beyond L1, collecting data in the solar wind without interruption.
Space weather services rely on satellites that monitor the solar wind and communicate their observations back to Earth. Traditional satellites cannot maintain an orbit at that location due to the Sun's gravitational pull, so SWIFT will use a fuel-less propulsion system called a solar sail.
In February 2022, SpaceX lost 39 of its 49 newly launched Starlink satellites due to a moderate space weather event. If SWIFT had been operational, it could have provided up to 60 minutes of advance warning, potentially saving millions of dollars in satellite replacement costs.
The most powerful recorded space weather event, the Carrington event in September 1859, caused fires in North America and Europe by supercharging telegraph lines. These events can cause geomagnetic storms, disrupt satellite operations, shut down the electric grid, expose astronauts to lethal doses of radiation, and create aurora displays.
By improving our ability to predict and prepare for space weather events, SWIFT will significantly increase the resilience of critical technological systems on Earth and protect astronauts in space.
[1] The Conversation, Expert Voices: Op-Ed & Insights. [2] NASA, Solar Sail Missions. [3] Space.com, What is a Solar Sail? [4] SpaceX, Starlink. [5] SWIFT Project, About SWIFT.
- The Next-Generation Space Weather Defense System, SWIFT, is a revolutionary constellation designed to mitigate potentially harmful space weather events, with a focus on extremes such as coronal mass ejections (CMEs), which can impact aviation, astronaut safety, power grids, and satellites.
- The SWIFT constellation will consist of a solar sail-powered "hub" beyond the L1 Lagrange point and three smaller satellites at L1, allowing scientists to track solar winds and magnetic fields more accurately before they reach Earth.
- The advancements in SWIFT include a longer warning time for Earth-bound solar events, extending up to 60 minutes or more, detailed mapping of CMEs' shape, speed, and magnetic structure, and fuel-less, long-duration station-keeping closer to the Sun than traditional satellites.
- In today's technological landscape, industries such as telecommunications, electric grids, aviation, space exploration, commercial tourism, satellite networks, and resource extraction from the Moon and nearby asteroids are all vulnerable to space weather.
- By enhancing our preparedness for space weather events, SWIFT will strengthen the resilience of vital technological systems on Earth and shield astronauts in space, drawing upon insights from disciplines like environmental-science, history, science, technology, and space-and-astronomy.
