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What NASA Is Learning from the Biggest Geomagnetic Storm in 20 Years


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What NASA Is Learning from the Biggest Geomagnetic Storm in 20 Years

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.

On 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.

A detailed, fiery image of the Sun showing bright solar flares and textured surface, with a small inset at the bottom right comparing the tiny size of Earth to the massive scale of the Sun.
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.

A green tractor with yellow wheels pulls a red trailer across a flat, dirt-covered field with some trees, a field of green plants, and a partly cloudy sky in the background.
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.
Storyblocks

“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.


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May 11, 2024
May 18, 2024

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May 11, 2024

May 18, 2024

Before and After

Trans-Atlantic Flights Rerouted during Gannon Storm

May 11, 2024 – May 18, 2024


During the Gannon storm on May 10 and 11, 2024, many trans-Atlantic flights took more southerly routes across the ocean to avoid the risk of higher radiation for passengers and crew, as well as to avoid potential communication and navigation losses closer to the North Pole. The first image shows a snapshot of flight patterns on May 11, 2024, at 3:30 UTC (11:30 p.m. EDT on May 10) during the Gannon storm, when flights were redirected to more southern routes. The second image shows the flight patterns one week later, on May 18, 2024, at 3:30 UTC as flights followed their typical route. Credit: Flightradar24

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.

A circular heatmap shows a swirling pattern of colors, with red and yellow regions indicating higher values, and blue and green areas showing lower values. The overlay covers the Atlantic Ocean and parts of surrounding continents.
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

In orbit, the expanded atmosphere increased drag on thousands of satellites. NASA’s ICESat-2 lost altitude and entered safe mode while NASA’s Colorado Inner Radiation Belt Experiment (CIRBE) CubeSat deorbited prematurely five months after the storm. Others, such as the European Space Agency’s Sentinel mission, required more power to maintain their orbits and perform maneuvers to avoid collisions with space debris.

The storm also dramatically changed the structure of an atmospheric layer called the ionosphere. A dense zone of the ionosphere that normally covers the equator at night dipped toward the South Pole in a check mark shape, causing a temporary gap near the equator.

The Gannon storm also rocked Earth’s magnetosphere, the magnetic bubble surrounding the planet. Data from NASA missions MMS (Magnetospheric Multiscale) and THEMIS-ARTEMIS — short for Time History of Events and Macroscale Interactions-Acceleration, Reconnection, Turbulence and Electrodynamics of the Moon’s Interaction with the Sun — saw giant, curling waves of particles and rolled-up magnetic fields along the edge of the CMEs. These waves were perfectly sized to periodically dump extra magnetic energy and mass into the magnetosphere upon impact, creating the largest electrical current seen in the magnetosphere in 20 years.

Incoming energy and particles from the Sun also created two new temporary belts of energetic particles within the magnetosphere. Discovered by CIRBE, these belts formed between the Van Allen radiation belts that permanently surround Earth. The belt’s discovery is important to spacecraft and astronauts that can be imperiled by high-energy electrons and protons in the belts.

Illustration of Earth surrounded by colorful, concentric rings representing the Van Allen radiation belts, with white magnetic field lines arching around the planet against a black space background.
The Gannon storm created two extra radiation belts, sandwiched between the two permanent Van Allen Belts. One of the new belts, shown in purple, included a population of protons, giving it a unique composition that hadn’t been seen before. The discovery of the new belts is particularly important for protecting spacecraft launching into geostationary orbits, since they travel through the Van Allen Belts several times before reaching their final orbit.
NASA/Goddard Space Flight Center/Kristen Perrin

Unusual Auroras

The storm also ignited auroras around the globe, including places where these celestial light shows are rare. NASA’s Aurorasaurus project was flooded with more than 6,000 observer reports from over 55 countries and all seven continents.

Photographers helped scientists understand why auroras observed throughout Japan were magenta rather than the typical red. Researchers studied hundreds of photos and found the auroras were surprisingly high — around 600 miles above the ground (200 miles higher than red auroras typically appear).

A torii gate stands by the shore with a small hill in the background, under a night sky filled with stars, a bright moon, and vivid purple and pink auroras.
In Japan, where it’s typical to see red auroras, numerous skywatchers captured photos of unusual magenta auroras instead. With the help of hundreds of photos like this one shared via social media, researchers found the magenta auroras were exceptionally high — around 600 miles above the ground (compared to a typical maximum height of 400 miles for red auroras, which are usually the highest).
KAGAYA

In a paper published in the journal Scientific Reports, the research team says the peculiar color likely resulted from a mix of red and blue auroras, produced by oxygen and nitrogen molecules lofted higher than usual as the Gannon storm heated and expanded the upper atmosphere.

“It typically needs some special circumstances, like we saw last May,” co-author Josh Pettit of NASA’s Goddard Space Flight Center said of Japan’s magenta auroras. “A very unique event indeed.”

Otherworldly Effects

Impacts of the Sun’s amped-up solar activity didn’t end at Earth. The solar active region that sparked the Gannon storm eventually rotated away from our planet and redirected its outbursts toward Mars.

As energetic particles from the Sun struck the Martian atmosphere, NASA’s MAVEN (Mars Atmosphere and Volatile Evolution) orbiter watched auroras engulf the Red Planet from May 14 to 20.

An animated gif of Mars, appearing in grayscale, with a pixellated pattern of purple and white lights shimmering on the left half of the planet, indicating auroras detected by NASA's MAVEN spacecraft.
The purple color in this animated GIF shows auroras across Mars’ nightside as detected by the Imaging Ultraviolet Spectrograph instrument aboard NASA’s MAVEN (Mars Atmosphere and Volatile EvolutioN) orbiter. The brighter the purple, the more auroras were present. MAVEN took these images between May 14 and 20, 2024, as energetic particles from a solar storm were arriving at Mars. The sequence pauses at the end, when the most energetic particles arrived and overwhelmed the instrument with noise. MAVEN made the observations as it orbited below Mars, looking up at the nightside of the planet. (Mars’ south pole can be seen on the right, in full sunlight.)
NASA/University of Colorado/LASP

Solar particles overwhelmed the star camera on NASA’s 2001 Mars Odyssey orbiter (which uses stars to orient the spacecraft), causing the camera to cut out for almost an hour.

On the Martian surface, images from the navigation cameras on NASA’s Curiosity rover were freckled with “snow” — streaks and specks caused by charged particles. Meanwhile, Curiosity’s Radiation Assessment Detector recorded the biggest surge of radiation since the rover landed in 2012. If astronauts had been there, they would have received a radiation dose of 8,100 micrograys — equivalent to 30 chest X-rays.

A black-and-white photo of a rocky Martian landscape, featuring a large sloped hill with visible layers on the right and a smaller peak in the distance under a hazy sky. Specks of white appear to dot the image from time to time, a response to solar energetic particles from the Sun hitting the camera.
The specks in this image sequence were caused by charged particles from the Sun hitting one of the navigation cameras aboard NASA’s Curiosity Mars rover on May 20, 2024. The sequence also shows the effects of a wind gust that happened to occur at the same time on the Martian surface.
NASA/JPL-Caltech

Still More to Come

The Gannon storm spread auroras to unusually low latitudes and has been called the best-documented geomagnetic storm in history. A year on, we have just begun unraveling its story. 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.

By Mara Johnson-Groh, Miles Hatfield, and Vanessa Thomas
NASA’s Goddard Space Flight Center, Greenbelt, Md.

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      “Birds face so many challenges,” said Cornell conservationist Amanda Rodewald. “This research will help us make strategic decisions about making changes that are precise, effective, and less costly. This is transformative. Now we can really drill in and know where specifically we’re going to be able to have the most positive impact in trying to stem bird declines.”
      By Karen Romano Young
      NASA Headquarters, Washington
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      With Voyager 2 in the background, John Casani holds a small U.S. flag that was sewn into the spacecraft’s thermal blankets before its 1977 launch. Then Voyager’s project manager, Casani was first to envision the mission’s Golden Record, which lies before him with its cover at right. NASA/JPL-Caltech During his work on several historic missions, Casani rose through a series of technical and management positions, making an indelible mark on the nation’s space program.  
      John R. Casani, a visionary engineer who served a central role in many of NASA’s historic deep space missions, died on Thursday, June 19, 2025, at the age of 92. He was preceded in death by his wife of 39 years, Lynn Casani, in 2008 and is survived by five sons and their families.
      Casani started at the Jet Propulsion Laboratory in Southern California in 1956 and went on to work as an electronics engineer on some of the nation’s earliest spacecraft after NASA’s formation in 1958. Along with leading the design teams for both the Ranger and Mariner series of spacecraft, he held senior project positions on many of the Mariner missions to Mars and Venus, and was project manager for three trailblazing space missions: Voyager, Galileo, and Cassini.
      His work helped advance NASA spacecraft in areas including mechanical technology, system design and integration, software, and deep space communications. No less demanding were the management challenges of these multifaceted missions, which led to innovations still in use today.
      JPL’s John Casani receives the National Air & Space Museum’s Lifetime Achievement Award.Carolyn Russo/NASM, National Air and Space Museum, Smithsonian Institution “John had a major influence on the development of spacecraft that visited almost every planet in our solar system, as well as the people who helped build them,” said JPL director Dave Gallagher. “He played an essential role in America’s first attempts to reach space and then the Moon, and he was just as crucial to the Voyager spacecraft that marked humanity’s first foray into interplanetary — and later, interstellar — space. That Voyager is still exploring after nearly 50 years is a testament to John’s remarkable engineering talent and his leadership that enabled others to push the boundaries of possibility.”
      Born in Philadelphia in 1932, Casani studied electrical engineering at the University of Pennsylvania. After a short stint at an Air Force research lab, he moved to California in 1956 and was hired to work at JPL, a division of Caltech, on the guidance system for the U.S. Army Ballistic Missile Agency’s Jupiter-C and Sergeant missile programs.
      In 1957, the Soviet Union launched Sputnik 1, the first human-made Earth satellite, alarming America and changing the trajectory of both JPL and Casani’s career. With the 1958 launch of Explorer 1, America’s first satellite, the lab transitioned to concentrating on robotic space explorers, and Casani segued from missiles to spacecraft.
      One of his jobs as payload engineer on Pioneer 3 and 4, NASA’s first missions to the Moon, was to carry each of the 20-inch-long (51-cm-long) probes in a suitcase from JPL to the launch site at Cape Canaveral, Florida, where he installed them in the rocket’s nose cone.
      At the dawn of the 1960s, Casani served as spacecraft systems engineer for the agency’s first two Ranger missions to the Moon, then joined the Mariner project in 1965, earning a reputation for being meticulous. Four years later, he was Mariner project manager.
      Asked to share some of his wisdom in a 2009 NASA presentation, Casani said, “The thing that makes any of this work … is toughness. Toughness because this is a tough business, and it’s a very unforgiving business. You can do 1,000 things right, but if you don’t do everything right, it’ll come back and bite you.”
      Casani’s next role: project manager for NASA’s high-profile flagship mission to the outer planets and beyond — Voyager. He not only led the mission from clean room to space, he was first to envision attaching a message representing humanity to any alien civilization that might encounter humanity’s first interstellar emissaries. 
      “I approached Carl Sagan,” he said in a 2007 radio interview, “and asked him if he could come up with something that would be appropriate that we could put on our spacecraft in a way of sending a message to whoever might receive it.” Sagan took up the challenge, and what resulted was the Golden Record, a 12-inch gold-plated copper disk containing sounds and images selected to portray the diversity of life and culture on Earth.
      Once Voyager 1 and 2 and their Golden Records launched in 1977, JPL wasted no time in pointing their “engineer’s engineer” toward Galileo, which would become the first mission to orbit a gas giant planet. As the mission’s initial project manager, Casani led the effort from inception to assembly. Along the way, he had to navigate several congressional attempts to end the project, necessitating multiple visits to Washington. The 1986 loss of Space Shuttle Challenger, from which Galileo was to launch atop a Centaur upper-stage booster, led to mission redesign efforts before its 1989 launch.
      After 11 years leading Galileo, Casani became deputy assistant laboratory director for flight projects in 1988, received a promotion just over a year later and then, from 1990 to 1991, served as project manager of Cassini, NASA’s first flagship mission to orbit Saturn.
      Casani became JPL’s first chief engineer in 1994, retiring in 1999 and serving on several nationally prominent committees, including leading the investigation boards of both the Mars Climate Orbiter and the Mars Polar Lander failures, and also leading the James Webb Space Telescope Independent Comprehensive Review Panel.
      In early 2003, Casani returned to JPL to serve as project manager for NASA’s Project Prometheus, which would have been the nation’s first nuclear-powered, electric-propulsion spacecraft. In 2005, he became manager of the Institutional Special Projects Office at JPL, a position he held until retiring again in 2012.
      “Throughout his career, John reflected the true spirit of JPL: bold, innovative, visionary, and welcoming,” said Charles Elachi, JPL’s director from 2001 to 2016. “He was an undisputed leader with an upbeat, fun attitude and left an indelible mark on the laboratory and NASA. I am proud to have called him a friend.”
      Casani received many awards over his lifetime, including NASA’s Exceptional Achievement Medal, the Management Improvement Award from the President of the United States for the Mariner Venus Mercury mission, and the Air and Space Museum Trophy for Lifetime Achievement.
      News Media Contacts
      Matthew Segal / Veronica McGregor
      Jet Propulsion Laboratory, Pasadena, Calif.
      818-354-8307 / 818-354-9452
      matthew.j.segal@jpl.nasa.gov / veronica.c.mcgregor@jpl.nasa.gov
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