Over the past three years, SpaceX has deployed thousands of satellites into low-Earth orbit as part of its business to beam high-speed internet service from space. But the company’s latest deployment of 49 new satellites after a Feb. 3 launch did not go as planned.
As a consequence of a geomagnetic storm triggered by a recent outburst of the sun, up to 40 of 49 newly launched Starlink satellites have been knocked out of commission. They are in the process of re-entering Earth’s atmosphere, where they will be incinerated.
The incident highlights the hazards faced by numerous companies planning to put tens of thousands of small satellites in orbit to provide internet service from space. And it’s possible that more solar outbursts will knock some of these newly deployed orbital transmitters out of the sky. The sun has an 11-year-long cycle in which it oscillates between hyperactive and quiescent states. Presently, it is ramping up to its peak, which has been forecast to arrive around 2025.
This recent solar paroxysm was relatively moderate by the sun’s standards. “I have every confidence that we’re going to see an extreme event in the next cycle, because that typically is what happens during a solar maximum,” said Hugh Lewis, a space debris expert at the University of Southampton in England. If a milquetoast outburst can knock out 40 Starlink satellites hanging out at low orbital altitudes, a more potent solar scream has the potential to inflict greater harm on the mega-constellations of SpaceX and other companies.
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SpaceX announced the looming destruction of as many as 40 of its satellites in a company blog post on Tuesday night. The company said that after the launch, the satellites were released to their intended orbit, about 130 miles above Earth.
This altitude was chosen partly to prevent potential collisions in the future with other satellites. If the satellites malfunction after being deployed at that altitude, and are unable to raise their orbits to more secure heights, “the atmosphere kind of reclaims the failed technology very rapidly,” Dr. Lewis said. “And that’s a very good safety measure.”
Image
A Falcon 9 rocket carried the doomed satellites into space from the Kennedy Space Center in Florida last week.Credit...Craig Bailey/Florida Today, via Associated Press
But on Jan. 29, before these satellites launched, a violent eruption from the sun of highly energetic particles and magnetism known as a coronal mass ejection was detected. That ejection arrived at Earth sometime around Feb. 2, creating a geomagnetic storm in Earth’s magnetic bubble.
The powerful storm added kinetic energy to particles in Earth’s atmosphere. “The atmosphere kind of puffs up, expands, as a result,” Dr. Lewis said. That expansion causes an increase in the atmosphere’s density, which in turn increases the drag experienced by objects moving through it, including satellites. This drag shrinks the size of their orbits, which draws them closer to the thick, lower atmosphere in which they burn up.
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According to SpaceX, during the recent Starlink deployment, “the escalation speed and severity of the storm caused atmospheric drag to increase up to 50 percent higher than during previous launches.” This ensured that as many as 40 of the 49 satellites would eventually succumb to the forces of gravity and perish.
There are currently a total of 1,915 Starlink satellites in orbit, so for SpaceX, a loss of up to 40 “is not a big deal from their point of view,” said Jonathan McDowell, an astronomer at the Harvard and Smithsonian Center for Astrophysics in Cambridge, Mass., who also catalogs and tracks artificial space objects.
But Dr. Lewis said “that probably accounts for potentially up to $100 million of hardware, if you include the cost of the launch.”
The dangers that solar outbursts and geomagnetic storms pose to objects in low-Earth orbit, from electrical damage to communications disruptions, are well known. The National Oceanic and Atmospheric Administration ranks geomagnetic storms on a scale from minor to extreme. The latest, a “moderate” storm, is noted by the agency as possibly causing changes in atmospheric drag that can alter orbits.
With these risks being known, did SpaceX take this hazard into account during this Starlink deployment?
“I’m just kind of dumbfounded,” said Samantha Lawler, an astronomer at the University of Regina in Canada. “Really? They did not think of this?”
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As a consequence of a geomagnetic storm triggered by a recent outburst of the sun, up to 40 of 49 newly launched Starlink satellites have been knocked out of commission. They are in the process of re-entering Earth’s atmosphere, where they will be incinerated.
The incident highlights the hazards faced by numerous companies planning to put tens of thousands of small satellites in orbit to provide internet service from space. And it’s possible that more solar outbursts will knock some of these newly deployed orbital transmitters out of the sky. The sun has an 11-year-long cycle in which it oscillates between hyperactive and quiescent states. Presently, it is ramping up to its peak, which has been forecast to arrive around 2025.
This recent solar paroxysm was relatively moderate by the sun’s standards. “I have every confidence that we’re going to see an extreme event in the next cycle, because that typically is what happens during a solar maximum,” said Hugh Lewis, a space debris expert at the University of Southampton in England. If a milquetoast outburst can knock out 40 Starlink satellites hanging out at low orbital altitudes, a more potent solar scream has the potential to inflict greater harm on the mega-constellations of SpaceX and other companies.
Advertisement
Continue reading the main story
SpaceX announced the looming destruction of as many as 40 of its satellites in a company blog post on Tuesday night. The company said that after the launch, the satellites were released to their intended orbit, about 130 miles above Earth.
This altitude was chosen partly to prevent potential collisions in the future with other satellites. If the satellites malfunction after being deployed at that altitude, and are unable to raise their orbits to more secure heights, “the atmosphere kind of reclaims the failed technology very rapidly,” Dr. Lewis said. “And that’s a very good safety measure.”
Image
A Falcon 9 rocket carried the doomed satellites into space from the Kennedy Space Center in Florida last week.Credit...Craig Bailey/Florida Today, via Associated Press
But on Jan. 29, before these satellites launched, a violent eruption from the sun of highly energetic particles and magnetism known as a coronal mass ejection was detected. That ejection arrived at Earth sometime around Feb. 2, creating a geomagnetic storm in Earth’s magnetic bubble.
The powerful storm added kinetic energy to particles in Earth’s atmosphere. “The atmosphere kind of puffs up, expands, as a result,” Dr. Lewis said. That expansion causes an increase in the atmosphere’s density, which in turn increases the drag experienced by objects moving through it, including satellites. This drag shrinks the size of their orbits, which draws them closer to the thick, lower atmosphere in which they burn up.
Advertisement
Continue reading the main story
According to SpaceX, during the recent Starlink deployment, “the escalation speed and severity of the storm caused atmospheric drag to increase up to 50 percent higher than during previous launches.” This ensured that as many as 40 of the 49 satellites would eventually succumb to the forces of gravity and perish.
There are currently a total of 1,915 Starlink satellites in orbit, so for SpaceX, a loss of up to 40 “is not a big deal from their point of view,” said Jonathan McDowell, an astronomer at the Harvard and Smithsonian Center for Astrophysics in Cambridge, Mass., who also catalogs and tracks artificial space objects.
But Dr. Lewis said “that probably accounts for potentially up to $100 million of hardware, if you include the cost of the launch.”
The dangers that solar outbursts and geomagnetic storms pose to objects in low-Earth orbit, from electrical damage to communications disruptions, are well known. The National Oceanic and Atmospheric Administration ranks geomagnetic storms on a scale from minor to extreme. The latest, a “moderate” storm, is noted by the agency as possibly causing changes in atmospheric drag that can alter orbits.
With these risks being known, did SpaceX take this hazard into account during this Starlink deployment?
“I’m just kind of dumbfounded,” said Samantha Lawler, an astronomer at the University of Regina in Canada. “Really? They did not think of this?”
Solar Storm Destroys 40 New SpaceX Satellites in Orbit (Published 2022)
The geomagnetic incident resulted in the Starlink transmitters drifting back into Earth’s atmosphere, where they will burn up, potentially costing the company about $100 million.
