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By NASA
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Preparations for Next Moonwalk Simulations Underway (and Underwater)
Dr. Misty Davies receives the prestigious AIAA Fellowship in May 2024 for her contributions to aerospace safety and autonomous systems, recognized at a ceremony in Washington, DC.NASA In May 2024, Dr. Misty Davies joined the American Institute of Aeronautics and Astronautics (AIAA) Class of 2024 Fellows at a ceremony in Washington, DC. The AIAA website states that, “AIAA confers Fellow upon individuals in recognition of their notable and valuable contributions to the arts, sciences or technology of aeronautics and astronautics.” The first AIAA Fellows were elected in 1934; since then only 2064 people have been selected for the honor. Dr. Davies has focused her career at NASA Ames Research Center on developing tools and techniques that enable the safety assurance of increasingly autonomous systems. She currently serves as the Associate Chief for Aeronautics Systems in the Intelligent Systems Division at NASA Ames and is the Aerospace Operations and Safety Program (AOSP) Technical Advisor for Assurance and Safety. More information on AIAA Fellows is at https://www.aiaa.org/news/news/2024/02/08/aiaa-announces-class-of-2024-honorary-fellows-and-fellows
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Last Updated Nov 22, 2024 Related Terms
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By NASA
The future of human space exploration took a bold step forward at NASA’s Johnson Space Center in Houston on Nov. 15, 2024, as Texas A&M University leaders’ broke ground for the Texas A&M University Space Institute.
Texas state officials, NASA leaders, and distinguished guests participated in the ceremony, held near the future development site of Johnson’s new Exploration Park, marking an important milestone in a transformative partnership to advance research, innovation, and human spaceflight.
NASA’s Johnson Space Center Director Vanessa Wyche gives remarks at the Texas A&M University Space Institute groundbreaking ceremony in Houston on Nov. 15, 2024. NASA/Robert Markowitz “This groundbreaking is not just a physical act of breaking ground or planting a flag,” said Johnson Director Vanessa Wyche. “This is the moment our vision—to dare to expand frontiers and unite with our partners to explore for the benefit of all humanity—will be manifested.”
The Texas A&M University Space Institute will be the first tenant at NASA’s 240-acre Exploration Park to support facilities that enhance commercial access, foster a collaborative development environment, and strengthen the United States’ competitiveness in the space and aerospace industries.
Chairman Bill Mahomes Jr. of the Texas A&M University System Board of Regents, left, Chancellor John Sharp of the Texas A&M University System, and Johnson Director Vanessa Wyche hold a commemorative plaque celebrating the establishment of the Texas A&M University Space Institute at Exploration Park. NASA/Robert Markowitz Exploration Park aims to foster research, technology transfer, and a sustainable pipeline of career development for the Artemis Generation and Texas workers transitioning to the space economy. The park represents a key achievement of Johnson’s 2024 Dare | Unite | Explore commitments, emphasizing its role as the hub of human spaceflight, developing strategic partnerships, and paving the way for a thriving space economy.
Research conducted at the Space Institute is expected to accelerate human spaceflight by providing opportunities for the brightest minds worldwide to address the challenges of living in low Earth orbit, on the Moon, and on Mars.
Senior leadership from Johnson Space Center gathers for the groundbreaking ceremony of the Texas A&M University Space Institute. NASA/Robert Markowitz Industry leaders and Johnson executives stood alongside NASA’s Lunar Terrain Vehicle and Space Exploration Vehicle, symbolizing their commitment to fostering innovation and collaboration.
Texas A&M University Space Institute director and retired NASA astronaut Dr. Nancy Currie-Gregg and Dr. Rob Ambrose, Space Institute associate director, served as the masters of ceremony for the event. Johnson leaders present included Deputy Director Stephen Koerner; Associate Director Donna Shafer; Associate Director for Vision and Strategy Douglas Terrier; Director of External Relations Office Arturo Sanchez; and Chief Technologist and Director of the Business Development and Technology Integration Office Nick Skytland.
Also in attendance were Texas State Rep. Greg Bonnen; Texas A&M University System Board of Regents Chairman William Mahomes Jr.; Texas A&M University System Chancellor John Sharp; Texas A&M University President and Retired Air Force Gen. Mark Welsh III; and Texas A&M Engineering Vice Chancellor and Dean Robert Bishop.
Texas A&M University Space Institute Director and retired NASA astronaut Nancy Currie-Gregg plants a Texas A&M University Space Institute flag at Johnson Space Center, symbolizing the partnership between the institute and NASA.NASA/Robert Markowitz The institute, expected to open in September 2026, will feature the world’s largest indoor simulation spaces for lunar and Martian surface operations, high-bay laboratories, and multifunctional project rooms.
“The future of Texas’ legacy in aerospace is brighter than ever as the Texas A&M Space Institute in Exploration Park will create an unparalleled aerospace, economic, business development, research, and innovation region across the state,” Wyche said. “Humanity’s next giant leap starts here!”
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By NASA
NASA astronaut and Expedition 72 Flight Engineer Nick Hague pedals on the Cycle Ergometer with Vibration Isolation and Stabilization (CEVIS), an exercise cycle located aboard the International Space Station’s Destiny laboratory module. CEVIS provides aerobic and cardiovascular conditioning through recumbent (leaning back position) or upright cycling activities.NASA Lee esta historia en español aquí.
The International Space Station is humanity’s home in space and a research station orbiting about 250 miles above the Earth. NASA and its international partners have maintained a continuous human presence aboard the space station for more than 24 years, conducting research that is not possible on Earth.
The people living and working aboard the microgravity laboratory also are part of the research being conducted, helping to address complex human health issues on Earth and prepare humanity for travel farther than ever before, including the Moon and Mars.
Here are a few frequently asked questions about how NASA and its team of medical physicians, psychologists, nutritionists, exercise scientists, and other specialized caretakers ensure astronauts’ health and fitness aboard the orbiting laboratory.
How long is a typical stay aboard the International Space Station?
A typical mission to the International Space Station lasts about six months, but can vary based on visiting spacecraft schedules, mission priorities, and other factors. NASA astronauts also have remained aboard the space station for longer periods of time. These are known as long-duration missions, and previous missions have given NASA volumes of data about long-term spaceflight and its effects on the human body, which the agency applies to any crewed mission.
During long-duration missions, NASA’s team of medical professionals focus on optimizing astronauts’ physical and behavioral health and their performance to help ensure mission success. These efforts also are helping NASA prepare for future human missions to the Moon, Mars, and beyond.
How does NASA keep astronauts healthy while in space?
NASA has a team of medical doctors, psychologists, and others on the ground dedicated to supporting the health and well-being of astronauts before, during, and after each space mission. NASA assigns physicians with specialized training in space medicine, called flight surgeons, to each crew once named to a mission. Flight surgeons oversee the health care and medical training as crew members prepare for their mission, and they monitor the crew’s health before, during, and after their mission to the space station.
How does NASA support its astronauts’ mental and emotional well-being while in space?
The NASA behavioral health team provides individually determined psychological support services for crew members and their families during each mission. Ensuring astronauts can thrive in extreme environments starts as early as the astronaut selection process, in which applicants are evaluated on competencies such as adaptability and resilience. Astronauts receive extensive training to help them use self-assessment tools and treatments to manage their behavioral health. NASA also provides training in expeditionary skills to prepare every astronaut for missions on important competencies, such as self-care and team care, communication, and leadership and followership skills.
To help maintain motivation and morale aboard the space station, astronauts can email, call, and video conference with their family and friends, receive crew care packages aboard NASA’s cargo resupply missions, and teleconference with a psychologist, if needed.
How does microgravity affect astronaut physical health?
In microgravity, without the continuous load of Earth’s gravity, there are many changes to the human body. NASA understands many of the human system responses to the space environment, including adaptations to bone density, muscle, sensory-motor, and cardiovascular health, but there is still much to learn. These spaceflight effects vary from astronaut to astronaut, so NASA flight surgeons regularly monitor each crew member’s health during a mission and individualize diet and fitness routines to prioritize health and fitness while in space.
Why do astronauts exercise in space?
Each astronaut aboard the orbiting laboratory engages in specifically designed, Earth-like exercise plans. To maintain their strength and endurance, crew members are scheduled for two and a half hours of daily exercise to support muscle, bone, aerobic, and sensorimotor health. Current equipment onboard the space station includes the ARED (Advanced Resistive Exercise Device), which mimics weightlifting; a treadmill, called T2; and the CEVIS (Cycle Ergometer with Vibration Isolation and Stabilization System) for cardiovascular exercise.
What roles do food and nutrition play in supporting astronaut health?
Nutrition plays a critical role in maintaining an astronaut’s health and optimal performance before, during, and after their mission. Food also plays a psychosocial role during an astronaut’s long-duration stay aboard the space station. Experts working in NASA’s Space Food Systems Laboratory at the agency’s Johnson Space Center in Houston develop foods that are nutritious and appetizing. Crew members also have the opportunity to supplement the menu with personal favorites and off-the-shelf items, which can provide a taste of home.
NASA astronaut and Expedition 71 Flight Engineer Tracy C. Dyson is pictured in the galley aboard the International Space Station’s Unity module showing off food packets from JAXA (Japan Aerospace Exploration Agency).NASA How does NASA know whether astronauts are getting the proper nutrients?
NASA’s nutritional biochemistry dietitians and scientists determine the nutrients (vitamins, minerals, calories) the astronauts require while in space. This team tracks what each crew member eats through a tablet-based tracking program, which each astronaut completes daily. The data from the app is sent to the dietitians weekly to monitor dietary intake. Analyzing astronaut blood and urine samples taken before, during, and after space missions is a crucial part of studying how their bodies respond to the unique conditions of spaceflight. These samples provide valuable insight into how each astronaut adapts to microgravity, radiation, and other factors that affect human physiology in space.
How do astronauts train to work together while in space?
In addition to technical training, astronauts participate in team skills training. They learn effective group living skills and how to look out for and support one another. Due to its remote and isolated nature, long-duration spaceflight can make teamwork difficult. Astronauts must maintain situational awareness and implement the flight program in an ever-changing environment. Therefore, effective communication is critical when working as a team aboard station and with multiple support teams on the ground. Astronauts also need to be able to communicate complex information to people with different professional backgrounds. Ultimately, astronauts are people living and working together aboard the station and must be able to do a highly technical job and resolve any interpersonal issues that might arise.
What happens if there is a medical emergency on the space station?
All astronauts undergo medical training and have regular contact with a team of doctors closely monitoring their health on the ground. NASA also maintains a robust pharmacy and a suite of medical equipment onboard the space station to treat various conditions and injuries. If a medical emergency requires a return to Earth, the crew will return in the spacecraft they launched aboard to receive urgent medical care on the ground.
Expedition 69 NASA astronaut Frank Rubio is seen resting and talking with NASA ISS Program Manager Joel Montalbano, kneeling left, NASA Flight Surgeon Josef Schmid, red hat, and NASA Chief of the Astronaut Office Joe Acaba, outside the Soyuz MS-23 spacecraft after he landed with Roscosmos cosmonauts Sergey Prokopyev and Dmitri Petelin in a remote area near the town of Zhezkazgan, Kazakhstan on Wednesday, Sept. 27, 2023.NASA/Bill Ingalls Learn more about NASA’s Human Health and Performance Directorate at:
www.nasa.gov/hhp
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By NASA
Hubble Space Telescope Home NASA’s Hubble Finds… Hubble Space Telescope Hubble Home Overview About Hubble The History of Hubble Hubble Timeline Why Have a Telescope in Space? Hubble by the Numbers At the Museum FAQs Impact & Benefits Hubble’s Impact & Benefits Science Impacts Cultural Impact Technology Benefits Impact on Human Spaceflight Astro Community Impacts Science Hubble Science Science Themes Science Highlights Science Behind Discoveries Hubble’s Partners in Science Universe Uncovered Explore the Night Sky Observatory Hubble Observatory Hubble Design Mission Operations Missions to Hubble Hubble vs Webb Team Hubble Team Career Aspirations Hubble Astronauts News Hubble News Hubble News Archive Social Media Media Resources Multimedia Multimedia Images Videos Sonifications Podcasts E-books Lithographs Fact Sheets Glossary Posters Hubble on the NASA App More Online Activities 5 Min Read NASA’s Hubble Finds Sizzling Details About Young Star FU Orionis
An artist’s concept of the early stages of the young star FU Orionis (FU Ori) outburst, surrounded by a disk of material. Credits:
NASA-JPL, Caltech In 1936, astronomers saw a puzzling event in the constellation Orion: the young star FU Orionis (FU Ori) became a hundred times brighter in a matter of months. At its peak, FU Ori was intrinsically 100 times brighter than our Sun. Unlike an exploding star though, it has declined in luminosity only languidly since then.
Now, a team of astronomers has wielded NASA’s Hubble Space Telescope‘s ultraviolet capabilities to learn more about the interaction between FU Ori’s stellar surface and the accretion disk that has been dumping gas onto the growing star for nearly 90 years. They find that the inner disk touching the star is extraordinarily hot — which challenges conventional wisdom.
The observations were made with the telescope’s COS (Cosmic Origins Spectrograph) and STIS (Space Telescope Imaging Spectrograph) instruments. The data includes the first far-ultraviolet and new near-ultraviolet spectra of FU Ori.
“We were hoping to validate the hottest part of the accretion disk model, to determine its maximum temperature, by measuring closer to the inner edge of the accretion disk than ever before,” said Lynne Hillenbrand of Caltech in Pasadena, California, and a co-author of the paper. “I think there was some hope that we would see something extra, like the interface between the star and its disk, but we were certainly not expecting it. The fact we saw so much extra — it was much brighter in the ultraviolet than we predicted — that was the big surprise.”
A Better Understanding of Stellar Accretion
Originally deemed to be a unique case among stars, FU Ori exemplifies a class of young, eruptive stars that undergo dramatic changes in brightness. These objects are a subset of classical T Tauri stars, which are newly forming stars that are building up by accreting material from their disk and the surrounding nebula. In classical T Tauri stars, the disk does not touch the star directly because it is restricted by the outward pressure of the star’s magnetic field.
The accretion disks around FU Ori objects, however, are susceptible to instabilities due to their enormous mass relative to the central star, interactions with a binary companion, or infalling material. Such instability means the mass accretion rate can change dramatically. The increased pace disrupts the delicate balance between the stellar magnetic field and the inner edge of the disk, leading to material moving closer in and eventually touching the star’s surface.
This is an artist’s concept of the early stages of the young star FU Orionis (FU Ori) outburst, surrounded by a disk of material. A team of astronomers has used the Hubble Space Telescope’s ultraviolet capabilities to learn more about the interaction between FU Ori’s stellar surface and the accretion disk that has been dumping gas onto the growing star for nearly 90 years. They found that the inner disk, touching the star, is much hotter than expected—16,000 kelvins—nearly three times our Sun’s surface temperature. That sizzling temperature is nearly twice as hot as previously believed. NASA-JPL, Caltech
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The enhanced infall rate and proximity of the accretion disk to the star make FU Ori objects much brighter than a typical T Tauri star. In fact, during an outburst, the star itself is outshined by the disk. Furthermore, the disk material is orbiting rapidly as it approaches the star, much faster than the rotation rate of the stellar surface. This means that there should be a region where the disk impacts the star and the material slows down and heats up significantly.
“The Hubble data indicates a much hotter impact region than models have previously predicted,” said Adolfo Carvalho of Caltech and lead author of the study. “In FU Ori, the temperature is 16,000 kelvins [nearly three times our Sun’s surface temperature]. That sizzling temperature is almost twice the amount prior models have calculated. It challenges and encourages us to think of how such a jump in temperature can be explained.”
To address the significant difference in temperature between past models and the recent Hubble observations, the team offers a revised interpretation of the geometry within FU Ori’s inner region: The accretion disk’s material approaches the star and once it reaches the stellar surface, a hot shock is produced, which emits a lot of ultraviolet light.
Planet Survival Around FU Ori
Understanding the mechanisms of FU Ori’s rapid accretion process relates more broadly to ideas of planet formation and survival.
“Our revised model based on the Hubble data is not strictly bad news for planet evolution, it’s sort of a mixed bag,” explained Carvalho. “If the planet is far out in the disk as it’s forming, outbursts from an FU Ori object should influence what kind of chemicals the planet will ultimately inherit. But if a forming planet is very close to the star, then it’s a slightly different story. Within a couple outbursts, any planets that are forming very close to the star can rapidly move inward and eventually merge with it. You could lose, or at least completely fry, rocky planets forming close to such a star.”
Additional work with the Hubble UV observations is in progress. The team is carefully analyzing the various spectral emission lines from multiple elements present in the COS spectrum. This should provide further clues on FU Ori’s environment, such as the kinematics of inflowing and outflowing gas within the inner region.
“A lot of these young stars are spectroscopically very rich at far ultraviolet wavelengths,” reflected Hillenbrand. “A combination of Hubble, its size and wavelength coverage, as well as FU Ori’s fortunate circumstances, let us see further down into the engine of this fascinating star-type than ever before.”
These findings have been published in The Astrophysical Journal Letters.
The observations were taken as part of General Observer program 17176.
The Hubble Space Telescope has been operating for over three decades and continues to make ground-breaking discoveries that shape our fundamental understanding of the universe. Hubble is a project of international cooperation between NASA and ESA (European Space Agency). NASA’s Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope and mission operations. Lockheed Martin Space, based in Denver, also supports mission operations at Goddard. The Space Telescope Science Institute in Baltimore, which is operated by the Association of Universities for Research in Astronomy, conducts Hubble science operations for NASA.
Facebook logo @NASAHubble @NASAHubble Instagram logo @NASAHubble Media Contacts:
Claire Andreoli (claire.andreoli@nasa.gov)
NASA’s Goddard Space Flight Center, Greenbelt, MD
Abigail Major, Ray Villard
Space Telescope Science Institute, Baltimore, MD
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Last Updated Nov 21, 2024 Editor Andrea Gianopoulos Location NASA Goddard Space Flight Center Related Terms
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Hubble Space Telescope
Since its 1990 launch, the Hubble Space Telescope has changed our fundamental understanding of the universe.
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By NASA
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5 Surprising NASA Heliophysics Discoveries Not Related to the Sun
With NASA’s fleet of heliophysics spacecraft, scientists monitor our Sun and investigate its influences throughout the solar system. However, the fleet’s constant watch and often-unique perspectives sometimes create opportunities to make discoveries that no one expected, helping us to solve mysteries about of the solar system and beyond.
Here are five examples of breakthroughs made by NASA heliophysics missions in other fields of science.
This graphic shows missions in NASA’s Heliophysics Division fleet as of July 2024. NASA Thousands and Thousands of Comets
The SOHO mission — short for Solar and Heliospheric Observatory, which is a joint mission between ESA (European Space Agency) and NASA — has a coronagraph that blocks out the Sun in order to see the Sun’s faint outer atmosphere, or corona.
It turns out SOHO’s coronagraph also makes it easy to spot sungrazing comets, those that pass so close to the Sun that other observatories can’t see them against the brightness of our star.
Before SOHO was launched in December 1995, fewer than 20 sungrazing comets were known. Since then, SOHO has discovered more than 5,000.
The vast number of comets discovered using SOHO has allowed scientists to learn more about sungrazing comets and identify comet families, descended from ancestor comets that broke up long ago.
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Two sungrazing comets fly close to the Sun in these images captured by ESA/NASA’s SOHO (Solar and Heliospheric Observatory). They were the 3,999th and 4,000th comets discovered in SOHO images. ESA/NASA/SOHO/Karl Battams Dimming of a Supergiant
In late 2019, the supergiant star Betelgeuse began dimming unexpectedly. Telescopes all over the world — and around it — tracked these changes until a few months later when Betelgeuse appeared too close to the Sun to observe. That’s when NASA’s STEREO (Sun-watching Solar Terrestrial Relations Observatory (STEREO) came to the rescue.
For several weeks in the middle of 2020, STEREO was the only observatory able to see Betelgeuse. At the time, the STEREO-A spacecraft was trailing behind Earth, at a vantage point where Betelgeuse was still far enough away from the Sun to be seen. This allowed astronomers to keep tabs on the star while it was out of view from Earth.
STEREO’s observations revealed another unexpected dimming between June and August of 2020, when ground-based telescopes couldn’t view the star.
Astronomers later concluded that these dimming episodes were caused by an ejection of mass from Betelgeuse — like a coronal mass ejection from our Sun but with about 400 times more mass — which obscured part of the star’s bright surface.
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The background image shows the star Betelgeuse as seen by the Heliospheric Imager aboard NASA’s STEREO (Solar Terrestrial Relations Observatory) spacecraft. The inset figure shows measurements of Betelgeuse’s brightness taken by different observatories from late 2018 to late 2020. STEREO’s observations, marked in red, revealed an unexpected dimming in mid-2020 when Betelgeuse appeared too close to the Sun for other observatories to view it. NASA/STEREO/HI (background); Dupree et al. (inset) The Glowing Surface of Venus
NASA’s Parker Solar Probe studies the Sun’s corona up close — by flying through it. To dive into the Sun’s outer atmosphere, the spacecraft has flown past Venus several times, using the planet’s gravity to fling itself closer and closer to the Sun.
On July 11, 2020, during Parker’s third Venus flyby, scientists used Parker’s wide-field imager, called WISPR, to try to measure the speed of the clouds that obscure Venus’ surface. Surprisingly, WISPR not only observed the clouds, it also saw through them to the surface below.
The images from that flyby and the next (in 2021) revealed a faint glow from Venus’ hot surface in near-infrared light and long wavelengths of red (visible) light that maps distinctive features like mountainous regions, plains, and plateaus.
Scientists aimed WISPR at Venus again on Nov. 6, 2024, during Parker’s seventh flyby, observing a different part of the planet than previous flybys. With these images, they’re hoping to learn more about Venus’ surface geology, mineralogy, and evolution.
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As Parker Solar Probe flew by Venus on its fourth flyby, it captured these images, strung into a video, showing bright and dark features on the nightside surface of the planet. NASA/APL/NRL The Brightest Gamma-Ray Burst
You’ve heard of the GOAT. But have you heard of the BOAT?
It stands for the “brightest of all time”, a gamma-ray burst discovered on Oct. 9, 2022.
A gamma-ray burst is a brief but intense eruption of gamma rays in space, lasting from seconds to hours.
This one, named GRB 221009A, glowed brilliantly for about 10 minutes in the constellation Sagitta before slowly fading.
The burst was detected by dozens of spacecraft, including NASA’s Wind, which studies the perpetual flow of particles from the Sun, called the solar wind, just before it reaches Earth.
Wind and NASA’s Fermi Gamma-Ray Space Telescope measured the brightness of GRB 221009A, showing that it was 70 times brighter than any other gamma-ray burst ever recorded by humans — solidifying its status as the BOAT.
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Astronomers think GRB 221009A represents the birth of a new black hole formed within the heart of a collapsing star. In this artist’s concept, the black hole drives powerful jets of particles traveling near the speed of light. The jets emit X-rays and gamma rays as they stream into space. NASA/Swift/Cruz deWilde A Volcano Blasts Its Way to Space
NASA’s ICON (Ionospheric Connection Explorer) launched in 2019 to study how Earth’s weather interacts with weather from space. When the underwater Hunga Tonga-Hunga Ha‘apai volcano erupted on Jan. 15, 2022, ICON helped show that the volcano produced more than ash and tsunami waves — its effects reached the edge of space.
In the hours after the eruption, ICON detected hurricane-speed winds in the ionosphere — Earth’s electrified upper atmospheric layer at the edge of space. ICON clocked the wind speeds at up to 450 miles per hour, making them the strongest winds the mission had ever measured below 120 miles altitude.
The ESA Swarm mission revealed that these extreme winds altered an electric current in the ionosphere called the equatorial electrojet. After the eruption, the equatorial electrojet surged to five times its normal peak power and dramatically flipped direction.
Scientists were surprised that a volcano could affect the electrojet so severely — something they’d only seen during a strong geomagnetic storm caused by an eruption from the Sun.
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The Hunga Tonga-Hunga Ha’apai eruption on Jan. 15, 2022, caused many effects, some illustrated here, that were felt around the world and even into space. Some of those effects, like extreme winds and unusual electric currents were picked up by NASA’s ICON (Ionospheric Connection Explorer) mission and ESA’s (the European Space Agency) Swarm. Illustration is not to scale. NASA’s Goddard Space Flight Center/Mary Pat Hrybyk-Keith By Vanessa Thomas
NASA’s Goddard Space Flight Center, Greenbelt, Md.
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Last Updated Nov 20, 2024 Related Terms
Comets Fermi Gamma-Ray Space Telescope Gamma-Ray Bursts Goddard Space Flight Center Heliophysics Heliophysics Division ICON (Ionospheric Connection Explorer) Parker Solar Probe (PSP) SOHO (Solar and Heliospheric Observatory) Stars STEREO (Solar TErrestrial RElations Observatory) The Sun The Sun & Solar Physics Uncategorized Venus Volcanoes Wind Mission Explore More
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