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Achoo! Solar Sneeze Could Light Up Earth's Atmosphere (Video)

Solar Flare AR2443
Solar flare AR2443 released a burst of particles toward Earth, creating a small solar storm. (Image credit: NASA/SDO)

Just in time for the flu season, it looks like the Earth is going to catch a bit of the sun's sneeze, following a solar eruption yesterday (Nov. 4).

Earth's stellar neighbor blasted off a loogie of charged particles — called a coronal mass ejection — when sunspot AR2443 had a medium-class eruption, which NASA's fleet of solar satellites captured. The sunspot is nearly 10 times the diameter of Earth from end to end, at roughly 124,000 miles (200,000 km) wide, according to

While the sneeze is in the right direction to hit Earth on Saturday (Nov. 7), it looks like the planet's atmosphere will catch just a mild case of auroras when the particles hit. predicted a "glancing blow" that could generate a low-grade storm in the upper atmosphere.

The storm is forecasted to be a G1 (on a scale spanning G1 to G5), which can produce auroras in high latitudes, and can have some minor effects on power grids and satellite operations.

Auroras are produced when charged particles from the sun interact with the Earth's magnetic field. Charging in the upper atmosphere "excites" molecules that are high up, producing a ghostly glow.

There could be more action yet from AR2443. The sunspot is currently near the sun's equator, and has the potential to produce a medium or M-class solar flare, added. There are four classes of solar flares, with M being the second most energetic, superseded only by X-class flares, which have the potential to cause power-line disruptions and damage electronics on satellites. Smaller eruptions, however, mainly produce a fun light show for skywatchers to observe, particularly near the poles.

The sun is just coming off the peak of an 11-year cycle of sunspot and magnetic activity. While the processes that produce solar bursts are still not fully understood, scientists have seen flares occur when magnetic field lines become twisted on the sun's surface.

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Elizabeth Howell
Elizabeth Howell

Elizabeth Howell, Ph.D., is a contributing writer for since 2012. As a proud Trekkie and Canadian, she tackles topics like spaceflight, diversity, science fiction, astronomy and gaming to help others explore the universe. Elizabeth's on-site reporting includes two human spaceflight launches from Kazakhstan, and embedded reporting from a simulated Mars mission in Utah. She holds a Ph.D. and M.Sc. in Space Studies from the University of North Dakota, and a Bachelor of Journalism from Canada's Carleton University. Her latest book, NASA Leadership Moments, is co-written with astronaut Dave Williams. Elizabeth first got interested in space after watching the movie Apollo 13 in 1996, and still wants to be an astronaut someday.