One year on, NASA scientists are still making huge discoveries about the largest geomagnetic storm to hit Earth in two decades, the Gannon storm. The findings are helping us better understand and prepare for the ways in which the Sun’s activity can affect us.
https://www.youtube.com/embed/9i47b__igEw?feature=oembed&enablejsapi=1&origin=https://science.nasa.govOn May 10, 2024, the first G5 or “severe” geomagnetic storm in over two decades hit Earth. The event did not cause any catastrophic damages, but it did produce surprising effects on Earth. The storm, which has been called the best-documented geomagnetic storm in history, spread auroras to unusually low latitudes and produced effects spanning from the ground to near-Earth space. Data captured during this historic event will be analyzed for years to come, revealing new lessons about the nature of geomagnetic storms and how best to weather them. Credit: NASA/Joy Ng
One year ago today, representatives from NASA and about 30 other U.S. government agencies gathered for a special meeting to simulate and address a threat looming in space. The threat was not an asteroid or aliens, but our very own life-giving Sun.
The inaugural Space Weather Tabletop Exercise was supposed to be a training event, where experts could work through the real-time ramifications of a geomagnetic storm, a global disruption to Earth’s magnetic field. Driven by solar eruptions, geomagnetic storms can decimate satellites, overload electrical grids, and expose astronauts to dangerous radiation. Minimizing the impacts of such storms requires close coordination, and this meeting was their chance to practice.
Then, their simulation turned into reality.
“The plan was to run through a hypothetical scenario, finding where our existing processes worked and where they needed improvement,” said Jamie Favors, director of NASA’s Space Weather Program at NASA Headquarters in Washington. “But then our hypothetical scenario was interrupted by a very real one.”
On May 10, 2024, the first G5 or “severe” geomagnetic storm in over two decades hit Earth. The event, named the Gannon storm in memory of leading space weather physicist Jennifer Gannon, did not cause any catastrophic damages. But a year on, key insights from the Gannon storm are helping us understand and prepare for future geomagnetic storms.
NASA’s Solar Dynamics Observatory captured this image of the Sun on May 7, 2024, in extreme ultraviolet light (at a wavelength of 304 Ångstroms). At center, the active region that instigated the Gannon storm stretches approximately 17 times the size of Earth. (A scaled image of Earth is inset for size reference.) In early May 2024, the active region released a chain of powerful solar eruptions, including several coronal mass ejections, or CMEs — giant clouds of solar particles — that merged to form a superstorm that reached Earth on May 10. Ahead of the storm, the National Oceanic and Atmospheric Administration, or NOAA, issued its first severe geomagnetic storm watch in almost two decades.
NASA/Helioviewer
Storm Consequences
The Gannon storm had effects on and off our planet.
On the ground, some high-voltage lines tripped, transformers overheated, and GPS-guided tractors veered off-course in the Midwestern U.S., further disrupting planting that had already been delayed by heavy rains that spring.
Some modern tractors use GPS to help farmers plant efficiently and maximize crop yields. During the Gannon storm in May 2024, however, certain GPS-guided tractor models veered off course or stopped working, disrupting or delaying planting for many U.S. farmers.
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“Not all farms were affected, but those that were lost on average about $17,000 per farm,” said Terry Griffin, a professor of Agricultural Economics at Kansas State University. “It’s not catastrophic, but they’ll miss it.”
In the air, the threat of higher radiation exposure, as well as communication and navigation losses, forced trans-Atlantic flights to change course.
May 11, 2024
May 18, 2024
Before and After
Trans-Atlantic Flights Rerouted during Gannon Storm
May 11, 2024 – May 18, 2024CurtainToggle2-UpImage Details
During the storm, Earth’s upper atmospheric layer called the thermosphere heated to unusually high temperatures. At 100 miles altitude, the temperature typically peaks at 1,200 degrees Fahrenheit, but during the storm it surpassed 2,100 degrees Fahrenheit. NASA’s GOLD (Global-scale Observations of the Limb and Disk) mission observed the atmosphere expanding from the heat to create a strong wind that lofted heavy nitrogen particles higher.
The unique swirls in this image of GOLD data, show the ratio of lighter oxygen to nitrogen — a key atmospheric indicator — that exhibited a previously unseen structure in Earth’s thermosphere.
Evans et al. 2024
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