SpaceX losing Starlink satellites due to geomagnetic space storm


A batch of Starlink satellites deploy in orbit after a launch on Nov. 13, 2021.


Elon Musk’s SpaceX expects to lose nearly an entire launch’s worth of Starlink satellites after a storm created by the sun struck the Earth’s atmosphere.

The company launched 49 Starlink satellites with a Falcon 9 rocket on Feb. 3. The mission was successful in delivering the batch of satellites to orbit, but disaster struck the next day.

A geomagnetic storm disturbed the Earth’s atmosphere. The Starlink satellites were in a low orbit, and the company said “up to 40 of the satellites” will be lost because of the storm, burning up in the Earth’s atmosphere.

Starlink is the company’s plan to build an interconnected network with thousands of satellites to deliver high-speed internet anywhere on the planet. SpaceX has launched about 1,900 Starlink satellites to orbit to date and has around 145,000 users of the service.

Tamitha Skov, a research scientist of the Aerospace Corp., broke down the basics of a geomagnetic storm for CNBC: First, “the sun shoots off magnets” in the form of a storm. The Earth’s magnetic shield dumps the solar storm’s energy into our planet’s upper atmosphere and heats it up, causing it to inflate and become denser. This increases the drag on satellites in low Earth orbit.

SpaceX said that “the escalation speed and severity of the storm caused atmospheric drag to increase” as much as 50% more than the satellites typically experience in low orbit. After the increased atmospheric drag was detected, the company’s operations team put the satellites into a fail-safe mode that rotates the spacecraft onto its edge to reduce drag — a position the company has previously described as a “shark-fin” orientation.

About 10 of the Starlink satellites are expected to survive and climb to their intended destination orbit.

SpaceX did not indicate whether it was aware of the storm, which the National Oceanic and Atmospheric Administration says was generated by a solar flare on Jan. 29.

NOAA measures geomagnetic storms on an increasing severity scale of G1 to G5. The agency had issued a warning for a “likely” geomagnetic storm of G1 to G2 on Feb. 2, the day before SpaceX launched.

There are an average of 1,700 such G1 storms over the course of an 11-year-long solar cycle, according to NOAA data highlighted by Erika Palmerio – a space weather research scientist at Predictive Science, a company that supports solar studies for U.S. government agencies.

“It’s a quite common situation in terms of geomagnetic activity” to see a storm the strength of the one that knocked out the Starlink satellites last week, Palmerio said.

SpaceX deploys the satellites in a lower orbit initially to both launch more at a time and so that any issues identified after launch will result in a malfunctioning satellite quickly deorbiting and burning up in the atmosphere. The company advertises its Starlink satellites as designed to fully disintegrate when reentering, “meaning no orbital debris is created and no satellite parts hit the ground.”

What the loss means for SpaceX

A Falcon 9 rocket carries 49 Starlink satellites toward orbit on Feb. 3, 2022.