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Space Weather Forecasts Can Give Satellites 1 Day of Warning When a Killer Solar Storm is Inbound

Posted April 11, 2019

Earth’s fleet of satellites is in a vulnerable position. When solar activity increases, high-energy particles are directed toward Earth. Our large fleet is in the direct path of all that energy, which can damage them or render them inoperable. But now we have another tool to help us protect our satellites.

An artist’s rendering of the Van Allen radiation belts surrounding Earth. The purple, concentric shells represent the inner and outer belts. They completely encircle Earth, but have been cut away in this image to show detail. Image Credit: NASA’s Conceptual Image Lab/Walt Feimer

A new study published in the Space Weather journal shows how scientists can now predict some of this dangerous space weather a day in advance, providing some early warning for satellites. Specifically, it gives a whole day of warning when space storms of high-energy particles are headed toward spacecraft and satellites in Earth’s outer radiation belt.

The Van Allen radiation belts surrounding Earth. This new study can predict when harmful space weather is heading for spacecraft and satellites in Earth’s outer radiation belts. Image: NASA

The study’s lead author is Yue Chen, a space scientist at Los Alamos National Laboratory.

“Society’s growing reliance on modern-technology infrastructures makes us especially vulnerable to space weather threats,” Chen said in a brief press release. “If our GPS or communications satellites fail, it could have wide-reaching, negative impacts on everything from air travel to bank transactions. So being able to accurately predict space weather has been a goal for a long time. This model is a firm step towards being able to do that.”

Earth’s outer radiation belt, or Van Allen belt, is situated around the equator, in a band about 34,500 km (22,000 miles) thick, starting at about 13,000 km (8,000 miles) above Earth and extending to about 48,000 km (30,000 miles). The belts are created by Earth’s magnetic field, and it actually protects Earth from high-energy particles. The particles come primarily form the Sun, and are mostly deflected by the belts. But the belts trap some of those particles. Many satellites spend at least some of their time in that belt, where the trapped high-energy particles can behave unpredictably.

When a space storm hits, the Sun sends more high-energy particles toward the Earth, some of which are deflected, and some of which are trapped, increasing the density of those particles in the belts. That makes it more likely for satellites to encounter them. It’s not the body of the satellites that are at risk; it’s their sensitive electronic systems. In order to protect the satellites from this dangerous weather, operators can put them into “safe mode” to reduce their vulnerability. This means shutting some systems down for a period of time.

Ironically, it’s our skill at miniaturizing electrical components that makes them more vulnerable to high-energy particles. As the size of components shrinks, so does their voltage. This means that the charge of the incoming particles is similar to the charge in the circuits, exposing the circuits to risk and creating a dangerous situation.

Knowing a full day in advance when a storm is going to hit allows operators to plan for it and to protect the satellites with minimal interruption.

The study used two satellites to predict when a solar storm is coming. The first is a Los Alamos National Laboratory satellite in low-Earth synchronous orbit. The second is a National Oceanic and Atmospheric Administration satellite in low-Earth orbit. The researchers used a “connect-the-dots” approach to create a reliable model of solar storms and high-energy particles. They were able to correlate between the electrons and the satellite orbits, and identify “informational triggers” that can predict changes in high-energy electrons in the outer radiation belt.

“We’re very excited about the potential for future enhancements to this model,” said Chen. “The more research and refinements we do, the increased potential for us to have more reliable forecasts with longer warning time before the arrival of new killer electrons.”

Source: Universe Today, by Evan Gough.

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