A hyperactive sunspot just hurled a huge X-class solar flare into space

A fast-erupting sunspot just hurled out a huge flare.

The hotbed of sun activity, known officially as AR2975, sent out a powerful X-class flare that has already created a temporary blackout in shortwave radio signals in the Americas, according to SpaceWeather.com. (AR2975 has already burped more than 17 moderate-sized flares in recent days, but this outburst is a bit more powerful.)

"Aviators, mariners, and ham radio operators may have noticed unusual propagation effects at frequencies below 30 MHz [megahertz]," the website reported Wednesday (March 30) in the hours after the flash.

Related: Earth braces for solar storm, potential aurora displays

The sun produced an X-class flare on March 20, 2022; this data from NASA's Solar Dynamics Observatory shows the extreme ultraviolet light of the flare in yellow. (Image credit: NASA/GSFC/SDO)

Solar flares are ranked first by category — A-class are weakest, then B-, C-, and M-class, with X-class the strongest — and then by size, with smaller numbers representing smaller flares within the class. Wednesday's flare was an X1.3-class flare, according to SpaceWeather.

Flares are outbursts of light, but are sometimes related to coronal mass ejections (CMEs), which shoot blobs of charged particles out into space. If a coronal mass ejection emerges from the flare and is pointed toward Earth, that could cause auroras, the stunning light shows caused by charged particles hitting Earth's atmosphere. SpaceWeather added that there is circumstantial evidence suggesting a CME is emerging from the sun, but more observations will be required to confirm that.

"A CME is almost certainly emerging from the blast site," SpaceWeather continued, noting that the U.S. Air Force has detected a Type II solar radio burst that can be associated with the shock waves of a CME.

One of 17 different flares from an active sunspot AR 2975 shines bright in this image from NASA's Solar Dynamics Observatory taken on March 28-29, 2022. (Image credit: NASA)

"Also, NASA's Solar Dynamics Observatory has imaged a solar tsunami apparently generated by a CME leaving the sun's atmosphere," SpaceWeather added.

SDO officially caught imagery of the event at 1:35 p.m. EST (1835 GMT), but NASA did not provide a detailed forecast beyond pointing to generic risks that may happen with solar flares.

"Flares and solar eruptions can impact radio communications, electric power grids, navigation signals, and pose risks to spacecraft and astronauts," NASA officials wrote in a statement.

The sun began its current cycle of solar activity in 2019, and is expected to reach the peak around 2025. Scientists aren't yet sure how active this solar cycle will be, although the forecast is for fewer sunspots than usual.

NASA and other space agencies constantly keep watch on solar activity to improve solar weather predictions. In most cases, CMEs simply cause auroras as charged particles hit the magnetic lines of Earth. More powerful storms, however, may cause issues with satellites or power lines.

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Elizabeth Howell
Staff Writer, Spaceflight

Elizabeth Howell (she/her), Ph.D., is a staff writer in the spaceflight channel since 2022 covering diversity, education and gaming as well. She was contributing writer for Space.com for 10 years before joining full-time. Elizabeth's reporting includes multiple exclusives with the White House and Office of the Vice-President of the United States, an exclusive conversation with aspiring space tourist (and NSYNC bassist) Lance Bass, speaking several times with the International Space Station, witnessing five human spaceflight launches on two continents, flying parabolic, working inside a spacesuit, and participating in a simulated Mars mission. Her latest book, "Why Am I Taller?", is co-written with astronaut Dave Williams. Elizabeth holds a Ph.D. and M.Sc. in Space Studies from the University of North Dakota, a Bachelor of Journalism from Canada's Carleton University and a Bachelor of History from Canada's Athabasca University. Elizabeth is also a post-secondary instructor in communications and science at several institutions since 2015; her experience includes developing and teaching an astronomy course at Canada's Algonquin College (with Indigenous content as well) to more than 1,000 students since 2020. Elizabeth first got interested in space after watching the movie Apollo 13 in 1996, and still wants to be an astronaut someday. Mastodon: https://qoto.org/@howellspace