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NASA’s EZIE Launching to Study Magnetic Fingerprints of Earth’s Aurora
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By NASA
5 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Researcher Ann Raiho measures sunlight interacting with yellow Coreopsis gigantea flowers during field work in the Jack and Laura Dangermond Preserve in California’s Santa Barbara County in 2022.NASA/Yoseline Angel For many plant species, flowering is biologically synced with the seasons. Scientists are clocking blooms to understand our ever-changing planet.
NASA research is revealing there’s more to flowers than meets the human eye. A recent analysis of wildflowers in California shows how aircraft- and space-based instruments can use color to track seasonal flower cycles. The results suggest a potential new tool for farmers and natural-resource managers who rely on flowering plants.
In their study, the scientists surveyed thousands of acres of nature preserve using a technology built by NASA’s Jet Propulsion Laboratory in Southern California. The instrument — an imaging spectrometer — mapped the landscape in hundreds of wavelengths of light, capturing flowers as they blossomed and aged over the course of months.
It was the first time the instrument had been deployed to track vegetation steadily through the growing season, making this a “first-of-a-kind study,” said David Schimel, a research scientist at JPL.
In this illustration, an imaging spectrometer aboard a research plane measures sunlight reflecting off California coastal scrub. In the data cube below, the top panel shows the true-color view of the area. Lower panels depict the spectral fingerprint for every point in the image, capturing the visible range of light (blue, green, and red wavelengths) to the near-infrared (NIR) and beyond. Spatial resolution is around 16 feet (5 meters).NASA For many plant species from crops to cacti, flowering is timed to seasonal swings in temperature, daylight, and precipitation. Scientists are taking a closer look at the relationship between plant life and seasons — known as vegetation phenology — to understand how rising temperatures and changing rainfall patterns may be impacting ecosystems.
Typically, wildflower surveys rely on boots-on-the-ground observations and tools such as time-lapse photography. But these approaches cannot capture broader changes that may be happening in different ecosystems around the globe, said lead author Yoseline Angel, a scientist at the University of Maryland-College Park and NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
“One challenge is that compared to leaves or other parts of a plant, flowers can be pretty ephemeral,” she said. “They may last only a few weeks.”
To track blooms on a large scale, Angel and other NASA scientists are looking to one of the signature qualities of flowers: color.
NASA’s AVIRIS sensors have been used to study wildfires, World Trade Center wreckage, and critical minerals, among numerous airborne missions over the years. AVIRIS-3 is seen here on a field campaign in Panama, where it helped analyze vegetation in many wavelengths of light not visible to human eyes.NASA/Shawn Serbin Mapping Native Shrubs
Flower pigments fall into three major groups: carotenoids and betalains (associated with yellow, orange, and red colors), and anthocyanins (responsible for many deep reds, violets, and blues). The different chemical structures of the pigments reflect and absorb light in unique patterns.
Spectrometers allow scientists to analyze the patterns and catalog plant species by their chemical “fingerprint.” As all molecules reflect and absorb a unique pattern of light, spectrometers can identify a wide range of biological substances, minerals, and gases.
Handheld devices are used to analyze samples in the field or lab. To survey moons and planets, including Earth, NASA has developed increasingly powerful imaging spectrometers over the past 45 years.
One such instrument is called AVIRIS-NG (short for Airborne Visible/InfraRed Imaging Spectrometer-Next Generation), which was built by JPL to fly on aircraft. In 2022 it was used in a large ecology field campaign to survey vegetation in the Jack and Laura Dangermond Preserve and the Sedgwick Reserve, both in Santa Barbara County. Among the plants observed were two native shrub species — Coreopsis gigantea and Artemisia californica — from February to June.
The scientists developed a method to tease out the spectral fingerprint of the flowers from other landscape features that crowded their image pixels. In fact, they were able to capture 97% of the subtle spectral differences among flowers, leaves, and background cover (soil and shadows) and identify different flowering stages with 80% certainty.
Predicting Superblooms
The results open the door to more air- and space-based studies of flowering plants, which represent about 90% of all plant species on land. One of the ultimate goals, Angel said, would be to support farmers and natural resource managers who depend on these species along with insects and other pollinators in their midst. Fruit, nuts, many medicines, and cotton are a few of the commodities produced from flowering plants.
Angel is working with new data collected by AVIRIS’ sister spectrometer that orbits on the International Space Station. Called EMIT (Earth Surface Mineral Dust Source Investigation), it was designed to map minerals around Earth’s arid regions. Combining its data with other environmental observations could help scientists study superblooms, a phenomenon where vast patches of desert flowers bloom after heavy rains.
One of the delights of researching flowers, Angel said, is the enthusiasm from citizen scientists. “I have social media alerts on my phone,” she added, noting one way she stays on top of wildflower activity around the world.
The wildflower study was supported as part of the Surface Biology and Geology High-Frequency Time Series (SHIFT) campaign. An airborne and field research effort, SHIFT was jointly led by the Nature Conservancy, the University of California, Santa Barbara, and JPL. Caltech, in Pasadena, manages JPL for NASA.
The AVIRIS instrument was originally developed through funding from NASA’s Earth Science Technology Office.
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Andrew Wang / Jane J. Lee
Jet Propulsion Laboratory, Pasadena, Calif.
626-379-6874 / 818-354-0307
andrew.wang@jpl.nasa.gov / jane.j.lee@jpl.nasa.gov
Written by Sally Younger
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Last Updated Mar 24, 2025 Related Terms
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By NASA
4 min read
NASA to Launch Three Rockets from Alaska in Single Aurora Experiment
Three NASA-funded rockets are set to launch from Poker Flat Research Range in Fairbanks, Alaska, in an experiment that seeks to reveal how auroral substorms affect the behavior and composition of Earth’s far upper atmosphere.
The experiment’s outcome could upend a long-held theory about the aurora’s interaction with the thermosphere. It may also improve space weather forecasting, critical as the world becomes increasingly reliant on satellite-based devices such as GPS units in everyday life.
Colorful ribbons of aurora sway with geomagnetic activity above the launch pads of Poker Flat Research Range. NASA/Rachel Lense The University of Alaska Fairbanks (UAF) Geophysical Institute owns Poker Flat, located 20 miles north of Fairbanks, and operates it under a contract with NASA’s Wallops Flight Facility in Virginia, which is part of NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
The experiment, titled Auroral Waves Excited by Substorm Onset Magnetic Events, or AWESOME, features one four-stage rocket and two two-stage rockets all launching in an approximately three-hour period.
Colorful vapor tracers from the largest of the three rockets should be visible across much of northern Alaska. The launch window is March 24 through April 6.
The mission, led by Mark Conde, a space physics professor at UAF, involves about a dozen UAF graduate student researchers at several ground monitoring sites in Alaska at Utqiagvik, Kaktovik, Toolik Lake, Eagle, and Venetie, as well as Poker Flat. NASA delivers, assembles, tests, and launches the rockets.
“Our experiment asks the question, when the aurora goes berserk and dumps a bunch of heat in the atmosphere, how much of that heat is spent transporting the air upward in a continuous convective plume and how much of that heat results in not only vertical but also horizontal oscillations in the atmosphere?” Conde said.
Confirming which process is dominant will reveal the breadth of the mixing and the related changes in the thin air’s characteristics.
“Change in composition of the atmosphere has consequences,” Conde said. “And we need to know the extent of those consequences.”
Most of the thermosphere, which reaches from about 50 to 350 miles above the surface, is what scientists call “convectively stable.” That means minimal vertical motion of air, because the warmer air is already at the top, due to absorption of solar radiation.
A technician with NASA’s Wallops Flight Facility sounding rocket office works on one of the payload sections of the rocket that will launch for the AWESOME campaign. NASA/Lee Wingfield When auroral substorms inject energy and momentum into the middle and lower thermosphere (roughly 60 to 125 miles up), it upsets that stability. That leads to one prevailing theory — that the substorms’ heat is what causes the vertical-motion churn of the thermosphere.
Conde believes instead that acoustic-buoyancy waves are the dominant mixing force and that vertical convection has a much lesser role. Because acoustic-buoyancy waves travel vertically and horizontally from where the aurora hits, the aurora-caused atmospheric changes could be occurring over a much broader area than currently believed.
Better prediction of impacts from those changes is the AWESOME mission’s practical goal.
“I believe our experiment will lead to a simpler and more accurate method of space weather prediction,” Conde said.
Two two-stage, 42-foot Terrier-Improved Malemute rockets are planned to respectively launch about 15 minutes and an hour after an auroral substorm begins. A four-stage, 70-foot Black Brant XII rocket is planned to launch about five minutes after the second rocket.
The first two rockets will release tracers at altitudes of 50 and 110 miles to detect wind movement and wave oscillations. The third rocket will release tracers at five altitudes from 68 to 155 miles.
Pink, blue, and white vapor traces should be visible from the third rocket for 10 to 20 minutes. Launches must occur in the dawn hours, with sunlight hitting the upper altitudes to activate the vapor tracers from the first rocket but darkness at the surface so ground cameras can photograph the tracers’ response to air movement.
By Rod Boyce
University of Alaska Fairbanks Geophysical Institute
NASA Media Contact: Sarah Frazier
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Last Updated Mar 21, 2025 Related Terms
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By NASA
A SpaceX Falcon 9 rocket lifts off from Vandenberg Space Force Base, carrying NASA’s EZIE spacecraft into orbit. SpaceX Under the nighttime California sky, NASA’s EZIE (Electrojet Zeeman Imaging Explorer) mission launched aboard a SpaceX Falcon 9 rocket at 11:43 p.m. PDT on March 14.
Taking off from Vandenberg Space Force Base near Santa Barbara, the EZIE mission’s trio of small satellites will fly in a pearls-on-a-string configuration approximately 260 to 370 miles above Earth’s surface to map the auroral electrojets, powerful electric currents that flow through our upper atmosphere in the polar regions where auroras glow in the sky.
At approximately 2 a.m. PDT on March 15, the EZIE satellites were successfully deployed. Within the next 10 days, the spacecraft will send signals to verify they are in good health and ready to embark on their 18-month mission.
“NASA has leaned into small missions that can provide compelling science while accepting more risk. EZIE represents excellent science being executed by an excellent team, and it is delivering exactly what NASA is looking for,” said Jared Leisner, program executive for EZIE at NASA Headquarters in Washington.
The electrojets — and their visible counterparts, theauroras — are generated duringsolar storms when tremendous amounts of energy get transferred into Earth’s upper atmosphere from the solar wind. Each of the EZIE spacecraft will map the electrojets, advancing our understanding of the physics of how Earth interacts with its surrounding space. This understanding will apply not only to our own planet but also to any magnetized planet in our solar system and beyond. The mission will also help scientists create models for predicting space weather to mitigate its disruptive impacts on our society.
“It is truly incredible to see our spacecraft flying and making critical measurements, marking the start of an exciting new chapter for the EZIE mission,” said Nelli Mosavi-Hoyer, project manager for EZIE at the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland. “I am very proud of the dedication and hard work of our team. This achievement is a testament to the team’s perseverance and expertise, and I look forward to the valuable insights EZIE will bring to our understanding of Earth’s electrojets and space weather.”
Instead of using propulsion to control their polar orbit, the spacecraft will actively use drag experienced while flying through the upper atmosphere to individually tune their spacing. Each successive spacecraft will fly over the same region 2 to 10 minutes after the former.
“Missions have studied these currents before, but typically either at the very large or very small scales,” said Larry Kepko, EZIE mission scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “EZIE will help us understand how these currents form and evolve, at scales we’ve never probed.”
The mission team is also working to distribute magnetometer kits called EZIE-Mag, which are available to teachers, students, and science enthusiasts who want to take their own measurements of the Earth-space electrical current system. EZIE-Mag data will be combined with EZIE measurements made from space to assemble a clear picture of this vast electrical current circuit.
The EZIE mission is funded by the Heliophysics Division within NASA’s Science Mission Directorate and is managed by the Explorers Program Office at NASA Goddard. The Johns Hopkins Applied Physics Laboratory leads the mission for NASA. Blue Canyon Technologies in Boulder, Colorado, built the CubeSats, and NASA’s Jet Propulsion Laboratory in Southern California built the Microwave Electrojet Magnetogram, which will map the electrojets, for each of the three satellites.
For the latest mission updates, follow NASA’s EZIE blog.
By Brett Molina
Johns Hopkins Applied Physics Laboratory
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Last Updated Mar 15, 2025 Editor Vanessa Thomas Contact Sarah Frazier sarah.frazier@nasa.gov Location Goddard Space Flight Center Related Terms
Heliophysics Auroras CubeSats EZIE (Electrojet Zeeman Imaging Explorer) Goddard Space Flight Center Heliophysics Division Missions Small Satellite Missions The Sun Explore More
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