The Washington Post

Sun shoots a fastball at Earth, but minimal impact expected on satellites, power grid

Combined images from NASA's Solar Dynamics Observatory (SDO) and Solar and Heliospheric Observatory (SOHO) satellites show a giant blob of plasma (top) ejected by the sun on Thursday. The cloud of charged gas is expected to reach Earth Sunday. (Courtesy of NASA)

A huge sunspot unleashed a blob of charged plasma Thursday that space weather watchers predict will blast past the Earth on Sunday. Satellite operators and power companies are keeping a close eye on the incoming cloud, which could distort the Earth’s magnetic field and disrupt radio communications, especially at higher latitudes.

“Our simulations show potential to pack a good punch to Earth’s near-space environment,” said Antti Pulkkinen of the Space Weather Laboratory at NASA’s Goddard Space Flight Center in Greenbelt.

But, he added, “We’re not looking at an extreme event here.”

The front edge of the burst should arrive Sunday morning, said Joseph Kunches, a spokesman for the Space Weather Prediction Center, part of the National Oceanic and Atmospheric Administration in Boulder, Colo.

“At first glance, it was, ‘Oh my God, it’s at the center of the [sun’s] disk, it ought to go right to the Earth,’ ” Kunches said. But upon further review and “head-scratching” Thursday, NOAA’s space weather team calculated that most of the plasma blob should pass harmlessly over the top of our planet.

“It’s more of a glancing blow,” Pulkkinen said.

At their most intense, solar discharges, known as “coronal mass ejections,” can disrupt satellites, radio communications and the power grid, and force airlines to reroute transcontinental flights that pass near the North Pole. Solar activity can also generate dancing auroras, the northern and southern lights.

Spit out by the sun Thursday morning, the huge blob of charged gas spotted by NASA satellites is speeding toward Earth at more than 2 million mph. The most damaging solar discharges, which are very rare, can zoom at speeds more than twice that fast.

The ejection appears to be the most threatening since the sun spit out three large blobs in quick succession last August.

Such discharges shoot out of sunspots, which are dark areas on the sun’s surface where tangled magnetic fields sometimes discharge massive spurts of energy.

Solar activity ramps up and down on a roughly 11-year cycle. Over the past year, the number of solar flares has jumped up as the sun approaches its predicted maximum activity in 2013.

While the Earth appears to have dodged this particular solar bullet, the roiling sunspot could generate more activity over the coming week before it rotates out of the view of the Earth.

“We’re keeping a close eye on it,” Pulkkinen said.

Besides sparking pretty auroras, heightened solar activity has a more tangible benefit: It cleans up space junk. As the sun acts up, the Earth’s atmosphere expands, increasing friction on dead satellites, rocket parts and other trash in low Earth orbit, pulling them down.

The amount of debris in Earth orbit “actually decreased during 2011 as solar activity increased toward an anticipated maximum,” NASA’s chief space junk watcher, Nicholas Johnson, wrote in the January issue of the agency’s Orbital Debris Quarterly Newsletter.

The Freddie Gray case

Please provide a valid email address.

You’re all set!

Campaign 2016 Email Updates

Please provide a valid email address.

You’re all set!

Get Zika news by email

Please provide a valid email address.

You’re all set!
Show Comments

Sign up for email updates from the "Confronting the Caliphate" series.

You have signed up for the "Confronting the Caliphate" series.

Thank you for signing up
You'll receive e-mail when new stories are published in this series.
Most Read



Success! Check your inbox for details.

See all newsletters

Close video player
Now Playing

To keep reading, please enter your email address.

You’ll also receive from The Washington Post:
  • A free 6-week digital subscription
  • Our daily newsletter in your inbox

Please enter a valid email address

I have read and agree to the Terms of Service and Privacy Policy.

Please indicate agreement.

Thank you.

Check your inbox. We’ve sent an email explaining how to set up an account and activate your free digital subscription.