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NASA’s Instruments Capture Sharpest Image of Earth’s Radiation Belt
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By NASA
Illustration of NASA’s BioSentinel spacecraft as it enters a heliocentric orbit. BioSentinel collected data during the May 2024 geomagnetic storm that hit Earth to learn more about the impacts of radiation in deep space.NASA/Daniel Rutter In May 2024, a geomagnetic storm hit Earth, sending auroras across the planet’s skies in a once-in-a-generation light display. These dazzling sights are possible because of the interaction of coronal mass ejections – explosions of plasma and magnetic field from the Sun – with Earth’s magnetic field, which protects us from the radiation the Sun spits out during turbulent storms.
But what might happen to humans beyond the safety of Earth’s protection? This question is essential as NASA plans to send humans to the Moon and on to Mars. During the May storm, the small spacecraft BioSentinel was collecting data to learn more about the impacts of radiation in deep space.
“We wanted to take advantage of the unique stage of the solar cycle we’re in – the solar maximum, when the Sun is at its most active – so that we can continue to monitor the space radiation environment,” said Sergio Santa Maria, principal investigator for BioSentinel’s spaceflight mission at NASA’s Ames Research Center in California’s Silicon Valley. “These data are relevant not just to the heliophysics community but also to understand the radiation environment for future crewed missions into deep space.”
BioSentinel – a small satellite about the size of a cereal box – is currently over 30 million miles from Earth, orbiting the Sun, where it weathered May’s coronal mass ejection without protection from a planetary magnetic field. Preliminary analysis of the data collected indicates that even though this was an extreme geomagnetic storm, that is, a storm that disturbs Earth’s magnetic field, it was considered just a moderate solar radiation storm, meaning it did not produce a great increase in hazardous solar particles. Therefore, such a storm did not pose any major issue to terrestrial lifeforms, even if they were unprotected as BioSentinel was. These measurements provide useful information for scientists trying to understand how solar radiation storms move through space and where their effects – and potential impacts on life beyond Earth – are most intense.
NASA’s Solar Dynamics Observatory captured this image of a solar flare on May 11, 2024. The image shows a subset of extreme ultraviolet light that highlights the extremely hot material in flares.NASA/SDO The original mission of BioSentinel was to study samples of yeast in deep space. Though these yeast samples are no longer alive, BioSentinel has adapted and continues to be a novel platform for studying the potential impacts of deep space conditions on life beyond the protection of Earth’s atmosphere and magnetosphere. The spacecraft’s biosensor instrument collects data about the radiation in deep space. Over a year and a half after its launch in Nov. 2022, BioSentinel retreats farther away from Earth, providing data of increasing value to scientists.
“Even though the biological part of the BioSentinel mission was completed a few months after launch, we believe that there is significant scientific value in continuing with the mission,” said Santa Maria. “The fact that the CubeSat continues to operate and that we can communicate with it, highlights the potential use of the spacecraft and many of its subsystems and components for future long-term missions beyond low Earth orbit.”
When we see auroras in the sky, they can serve as a stunning reminder of all the forces we cannot see that govern our cosmic neighborhood. As NASA and its partners seek to understand more about space environments, platforms like BioSentinel are essential to learn more about the risks of surviving beyond Earth’s sphere of protection.
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Last Updated Sep 26, 2024 Related Terms
General Ames Research Center Ames Research Center's Science Directorate Ames Space Biosciences CubeSats NASA Centers & Facilities Science & Research Small Satellite Missions View the full article
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By European Space Agency
Just a month after its launch, ESA’s Arctic Weather Satellite has already delivered its first images, notably capturing Storm Boris, which has been wreaking havoc across central Europe.
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By NASA
Figure 1. An artist’s concept of the Van Allen belts with a cutaway section of the giant donuts of radiation that surround Earth. Image Credit: NASA Goddard Space Flight Center/Scientific Visualization Studio A new instrument is using advanced detection techniques and leveraging an orbit with specific characteristics to increase our understanding of the Van Allen belts—regions surrounding Earth that contain energetic particles that can endanger both robotic and human space missions. Recently, the instrument provided a unique view of changes to this region that were brought on by an intense magnetic storm in May 2024.
The discovery of the Van Allen radiation belts by the U.S. Explorer 1 mission in 1958 marked a prominent milestone in space physics and demonstrated that Earth’s magnetosphere efficiently accelerates and traps energetic particles. The inner belt contains protons in the MeV (million electric volt) to GeV (109 electric volt) range, and even higher concentrations of energetic electrons of 100s of keV (1000 electric volt) to MeV are found in both the inner belt and the outer belt.
The energetic electrons in these belts—also referred to as “killer electrons”—can have detrimental effects on spacecraft subsystems and are harmful to astronauts performing extravehicular activities. Understanding the source, loss, and varying concentrations of these electrons has been a longstanding research objective. High-energy resolution and clean measurements of these energetic electrons in space are required to further our understanding of their properties and enable more reliable prediction of their intensity.
Overcoming the challenges of measuring relativistic electrons in the inner belt
Measuring energetic electrons cleanly and accurately has been a challenge, especially in the inner belt, where MeV to GeV energy protons also exist. NASA’s Van Allen Probes, which operated from 2012 to 2019 in low inclination, geo-transfer-like orbits, showed that instruments traversing the heart of the inner radiation belt are subject to penetration by the highly energetic protons located in that region. The Relativistic Electron Proton Telescope (REPT) and the Magnetic Electron and Ion Spectrometer (MagEIS) instruments onboard the Van Allen Probes were heavily shielded but were still subject to inner-belt proton contamination.
To attempt to minimize these negative effects, a University of Colorado Boulder team led by Dr. Xinlin Li, designed the Relativistic Electron Proton Telescope integrated little experiment (REPTile)—a simplified and miniaturized version of REPT—to fly onboard the Colorado Student Space Weather Experiment (CSSWE). An effort supported by the National Science Foundation, the 3-Unit CSSWE CubeSat operated in a highly inclined low Earth orbit (LEO) from 2012 to 2014. In this highly inclined orbit, the spacecraft and the instruments it carried were only exposed to the inner-belt protons in the South Atlantic Anomaly (SAA) region where the Earth’s magnetic field is weaker, which greatly reduced the time that protons impacted the measurement of electrons.
REPTile’s success motivated a team, also led by Dr. Xinlin Li, to design REPTile-2—an advanced version of REPTile—to be hosted on the Colorado Inner Radiation Belt Experiment (CIRBE) mission. Like CSSWE, CIRBE operates in a highly inclined low-Earth orbit to ensure the exposure to damaging inner-belt protons is minimized. The team based the REPTile-2 design on REPTile but incorporated two additional technologies—guard rings and Pulse Height Analysis—to enable clean, high-energy-resolution measurements of energetic electrons, especially in the inner belt.
Figure 2: PI observing two engineers testing the interface between the CIRBE bus and REPTile-2 on September 29, 2021. Image Credit: Xinlin Li, University of Colorado Boulder As shown on the left in Figure 3, the field of view (FOV) of REPTile-2 is 51o. Electrons and protons enter the FOV and are measured when they reach a stack of silicon detectors where they deposit their energies. However, very energetic protons (energy greater than 60 MeV) could penetrate through the instrument’s tungsten and aluminum shielding and masquerade as valid particles, thus contaminating the intended measurements. To mitigate this contamination, the team designed guard rings that surround each detector. These guard rings are electronically separated from the inner active area of each detector and are connected by a separate electric channel. When the guard rings are triggered (i.e., hit by particles coming outside of the FOV), the coincident measurements are considered invalid and are discarded. This anti-coincidence technique enables cleaner measurements of particles coming through the FOV.
Figure 3. Left (adapted from Figure 1 of Khoo et al., 2022): Illustration of REPTile-2 front end with key features labeled; Right: REPTile-2 front end integrated with electronic boards and structures, a computer-aided design (CAD) model, and a photo of integrated REPTile-2. Image Credit: Xinlin Li, University of Colorado Boulder To achieve high energy resolution, the team also applied full Pulse Height Analysis (PHA) on REPTile-2. In PHA, the magnitude of measured charge in the detector is directly proportional to the energy deposited from the incident electrons. Unlike REPTile, which employed a simpler energy threshold discrimination method yielding three channels for the electrons, REPTile-2 offers enhanced precision with 60 energy channels for electron energies ranging from 0.25 – 6 MeV. The REPT instrument onboard the Van Allen Probes also employed PHA but while REPT worked very well in the outer belt, yielding fine energy resolution, it did not function as well in the inner belt since the instrument was fully exposed to penetrating energetic protons because it did not have the guard rings implemented.
Figure 4: The CIRBE team after a successful “plugs-out” test of the CIRBE spacecraft on July 21, 2022. During this test the CIRBE spacecraft successfully received commands from ground stations and completed various performance tests, including data transmission back to ground stations at LASP. Image Credit: Xinlin Li, University of Colorado Boulder CIRBE and REPTile-2 Results
CIRBE’s launch, secured through the NASA CubeSat Launch Initiative (CSLI), took place aboard SpaceX’s Falcon 9 rocket as part of the Transporter-7 mission on April 15, 2023. REPTile-2, activated on April 19, 2023, has been performing well, delivering valuable data about Earth’s radiation belt electrons. Many features of the energetic electrons in the Van Allen belts have been revealed for the first time, thanks to the high-resolution energy and time measurements REPTile-2 has provided.
Figure 5 shows a sample of CIRBE/REPTile-2 measurements from April 2024, and illustrates the intricate drift echoes or “zebra stripes” of energetic electrons, swirling around Earth in distinct bunches. These observations span a vast range across the inner and outer belts, encompassing a wide spectrum of energies and electron fluxes extending over six orders of magnitude. By leveraging advanced guard rings, Pulse Height Analysis (PHA), and a highly inclined LEO orbit, REPTile-2 is delivering unprecedented observations of radiation belt electrons.
Figure 5: Color-coded electron fluxes detrended between REPTile-2 measurements for a pass over the South Atlantic Anomaly region on April 24, 2023, and their average, i.e., the smoothed electron fluxes using a moving average window of ±19% in energy; Black curves plotted on top of the color-coded electron fluxes are contours of electron drift period in hr. The second horizontal-axis, L, represents the magnetic field line, which CIRBE crosses. The two radiation belts and a slot region in between are indicated by the red lines and arrow, respectively. Image Credit: Xinlin Li, University of Colorado Boulder In fact, the team recently announced that measurements from CIRBE/REPTile-2 have revealed a new temporary third radiation belt composed of electrons and sandwiched between the two permanent belts. This belt formed during the magnetic storm in May 2024, which was the largest in two decades. While such temporary belts have been seen after big storms previously, the data from CIRBE/REPTile-2 are providing a new viewpoint with higher energy resolution data than before. Scientists are currently studying the data to better understand the belt and how long it might stick around — which could be many months.
PROJECT LEAD
Dr. Xinlin Li, University of Colorado Laboratory for Atmospheric and Space Physics and Department of Aerospace Engineering Sciences.
SPONSORING ORGANIZATIONS
Heliophysics Flight Opportunities for Research & Technology (H-FORT) program, National Science Foundation
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Last Updated Sep 17, 2024 Related Terms
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By NASA
This view of Jupiter was captured by the JunoCam instrument aboard NASA’s Juno spacecraft during the mission’s 62nd close flyby of the giant planet on June 13. Citizen scientist Jackie Branc made the image using raw JunoCam data.Image data: NASA/JPL-Caltech/SwRI/MSSS. Image processing: Jackie Branc (CC BY) Using data from the Advanced Stellar Compass (ASC) star tracker cameras aboard NASA’s Juno, this graphic shows the mission’s model for radiation intensity at different points in the spacecraft’s orbit around Jupiter.NASA/JPL-Caltech/DTU Using cameras designed for navigation, scientists count ‘fireflies’ to determine the amount of radiation the spacecraft receives during each orbit of Jupiter.
Scientists with NASA’s Juno mission have developed the first complete 3D radiation map of the Jupiter system. Along with characterizing the intensity of the high-energy particles near the orbit of the icy moon Europa, the map shows how the radiation environment is sculpted by the smaller moons orbiting near Jupiter’s rings.
The work relies on data collected by Juno’s Advanced Stellar Compass (ASC), which was designed and built by the Technical University of Denmark, and the spacecraft’s Stellar Reference Unit (SRU), which was built by Leonardo SpA in Florence, Italy. The two datasets complement each other, helping Juno scientists characterize the radiation environment at different energies.
Both the ASC and SRU are low-light cameras designed to assist with deep-space navigation. These types of instruments are on almost all spacecraft. But to get them to operate as radiation detectors, Juno’s science team had to look at the cameras in a whole new light.
“On Juno we try to innovate new ways to use our sensors to learn about nature, and we have used many of our science instruments in ways they were not designed for,” said Scott Bolton, Juno principal investigator from the Southwest Research Institute in San Antonio. “This is the first detailed radiation map of the region at these higher energies, which is a major step in understanding how Jupiter’s radiation environment works. This will help planning observations for the next generation of missions to the Jovian system.”
Counting Fireflies
Consisting of four star cameras on the spacecraft’s magnetometer boom, Juno’s ASC takes images of stars to determine the spacecraft’s orientation in space, which is vital to the success of the mission’s magnetic field experiment. But the instrument has also proved to be a valuable detector of high-energy particle fluxes in Jupiter’s magnetosphere. The cameras record “hard radiation,” or ionizing radiation that impacts a spacecraft with sufficient energy to pass through the ASC’s shielding.
“Every quarter-second, the ASC takes an image of the stars,” said Juno scientist John Leif Jørgensen of the Technical University of Denmark. “Very energetic electrons that penetrate its shielding leave a telltale signature in our images that looks like the trail of a firefly. The instrument is programmed to count the number of these fireflies, giving us an accurate calculation of the amount of radiation.”
Jupiter’s moon Europa was captured by the JunoCam instrument aboard NASA’s Juno spacecraft during the mission’s close flyby on Sept. 29, 2022.Image data: NASA/JPL-Caltech/SwRI/MSSS. Image processing: Björn Jónsson (CC BY 3.0) Because of Juno’s ever-changing orbit, the spacecraft has traversed practically all regions of space near Jupiter.
ASC data suggests that there is more very high-energy radiation relative to lower-energy radiation near Europa’s orbit than previously thought. The data also confirms that there are more high-energy electrons on the side of Europa facing its orbital direction of motion than on the moon’s trailing side. This is because most of the electrons in Jupiter’s magnetosphere overtake Europa from behind due to the planet’s rotation, whereas the very high-energy electrons drift backward, almost like fish swimming upstream, and slam into Europa’s front side.
Jovian radiation data is not the ASC’s first scientific contribution to the mission. Even before arriving at Jupiter, ASC data was used to determine a measurement of interstellar dust impacting Juno. The imager also discovered a previously uncharted comet using the same dust-detection technique, distinguishing small bits of the spacecraft ejected by microscopic dust impacting Juno at a high velocity.
Dust Rings
Like Juno’s ASC, the SRU has been used as a radiation detector and a low-light imager. Data from both instruments indicates that, like Europa, the small “shepherd moons” that orbit within or close to the edge of Jupiter’s rings (and help to hold the shape of the rings) also appear to interact with the planet’s radiation environment. When the spacecraft flies on magnetic field lines connected to ring moons or dense dust, the radiation count on both the ASC and SRU drops precipitously. The SRU is also collecting rare low-light images of the rings from Juno’s unique vantage point.
“There is still a lot of mystery about how Jupiter’s rings were formed, and very few images have been collected by prior spacecraft,” said Heidi Becker, lead co-investigator for the SRU and a scientist at NASA’s Jet Propulsion Laboratory in Southern California, which manages the mission. “Sometimes we’re lucky and one of the small shepherd moons can be captured in the shot. These images allow us to learn more precisely where the ring moons are currently located and see the distribution of dust relative to their distance from Jupiter.”
More About the Mission
NASA’s Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Juno mission for the principal investigator, Scott Bolton, of the Southwest Research Institute in San Antonio. Juno is part of NASA’s New Frontiers Program, which is managed at NASA’s Marshall Space Flight Center in Huntsville, Alabama, for the agency’s Science Mission Directorate in Washington. The Technical University of Denmark designed and built the Advanced Stellar Compass. The Stellar Reference Unit was built by Leonardo SpA in Florence, Italy. Lockheed Martin Space in Denver built and operates the spacecraft.
More information about Juno is available at:
https://www.nasa.gov/juno
News Media Contacts
DC Agle
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-9011
agle@jpl.nasa.gov
Karen Fox / Alana Johnson
NASA Headquarters, Washington
202-385-1600
karen.c.fox@nasa.gov / alana.r.johnson@nasa.gov
Simon Koefoed Toft
Technical University of Denmark, Copenhagen
+45 9137 0088
sito@dtu.dk
Deb Schmid
Southwest Research Institute, San Antonio
210-522-2254
dschmid@swri.org
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Last Updated Aug 20, 2024 Related Terms
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By NASA
Name: Xiaoyi Li
Title: Instrument Systems Engineer (ISE) of Venus Atmospheric Structure Investigation (VASI) for the Deep Atmosphere Venus Investigation of Noble gases, Chemistry, and Imaging (DAVINCI) and Deputy ISE of Comprehensive Auroral Precipitation Experiment (CAPE) instrument for the Geospace Dynamics Constellation (GDC) mission
Formal Job Classification: Instrument Systems Engineer
Organization: Instrument/Payload Systems Engineering Branch, Engineering Directorate (Code 592)
Xiaoyi Li is an instrument systems engineer at NASA’s Goddard Space Flight Center in Greenbelt, Md. “My role involves not only managing technical tasks but also blending a variety of technical skills and personalities,” she said. “Understanding of the technical connections between different components is essential to ensure the integrated systems meet requirements. In addition, helping to cultivate collaboration and synthesize diverse expertise is vital. I find the process of learning about and achieving integration of different personalities within the team particularly rewarding.”Photo Courtesy Xiaoyi Li What do you do and what is most interesting about your role here at Goddard?
I have two roles. As the instrument systems engineer of VASI, I lead the technical team to develop a sensor suite for this component of NASA’s upcoming DAVINCI mission to Venus. I am also the deputy instrument systems engineer of CAPE where I assist the lead for developing the CAPE instrument for the Geospace Dynamics Constellation mission. The most intriguing aspect of my job is to collaborate with two talented and diverse technical teams, learn from team members, and come up with solutions to resolve technical challenges within budget and schedule.
What is your educational background?
I received a bachelor’s degree in mechanical engineering from Tongji University in Shanghai, China. I furthered my education at the University of New South Wales, Australia, where I earned a master’s in mechanical engineering. After I moved to the U.S., I received a Ph.D. in mechanical engineering from the University of Central Florida in Orlando. My doctorate was funded by a NASA grant to design, build and test a spaceflight cryocooler.
Why did you become a mechanical engineer?
I grew up in an engineering family. My mother was a chemical engineer. My father was an architect and structural engineer. I grew up watching them build large factories. While I would like to think I would have become an engineer without their influence, growing up with such incredible role models gave me access to, and an understanding of engineering disciplines that I never really considered any other profession.
What brought you to Goddard?
Upon completing my Ph.D. in 2005, I started out as a mission analyst for launch service programs at NASA’s Kennedy Space Center in Florida. In 2009, I began working as a thermal engineer for NASA’s Wallops Flight Facility in Virginia. In 2010, I came across a position that brought me back to my Ph.D. days and I couldn’t pass up the opportunity. I joined the Cryogenics and Fluids Branch at Goddard.
What did you do at Goddard before your current position?
I contributed to multiple engineering and science studies, proposals, and projects as a cryogenics engineer. Notably, I served as the principal investigator for two IRAD studies. One of the studies was submitted to the Patent Office and later was granted a new patent. Additionally, I was a co-inventor for another patent. Prior to joining my current group, I held the position of instrument cryogenics lead for the Roman Space Telescope. I served as the associate branch head in my current organization before devoting full time as an instrument systems engineer.
What are your main responsibilities as the instrument systems engineer for CAPE and VASI?
As the deputy instrument systems engineer for CAPE, my main responsibility is to assist the lead to coordinate multiple technical teams. The main focus is to work with the mechanical, electrical, thermal, structural, and other engineers to build electron/ion analyzers. For the VASI instrument, which has a smaller team, I take a more direct role in organizing and coordinating the technical work. This position allows me to engage in hands-on engineering tasks, which is extremely gratifying being able to get “my hands dirty.”
My role involves not only managing technical tasks but also blending a variety of technical skills and personalities. Understanding of the technical connections between different components is essential to ensure the integrated systems meet requirements. In addition, helping to cultivate collaboration and synthesize diverse expertise is vital. I find the process of learning about and achieving integration of different personalities within the team particularly rewarding.
How do you coordinate between all the different systems and personalities?
My experience includes over eight years in leadership roles, supported by extensive training and a robust technical background. This includes a one-year detail assignment in Goddard’s Science Mission Directorate. In this role, I facilitate collaboration within the engineering team, as well as between the engineers and the scientists to ensure that the instrument meets scientific objectives while adhering to well established engineering best practices and principles. Additionally, I empower our subject matter experts to pursue their innovative ideas while guiding them toward a unified direction through a shared vision. Although individual approaches may vary, we are all committed to the collective goal of a successful mission.
Who were your mentors and what did they advise?
I am grateful for the guidance of two mentors who have been instrumental in my development. Mr. Dave Everett, a systems engineer by trade and the current head of our branch, has been my technical mentor. He taught me, among many other things, the importance of understanding the overall system. Ms. Maria So, my leadership mentor, is a former senior executive service (SES) member at Goddard. As a fellow Chinese woman and engineer, her influence has been profound. She has guided me and acted as a sounding board for some very exciting but challenging decisions these past years. She also taught me the importance of seeing the bigger picture and the critical organizational leadership role to systems engineering, which has shaped my approach to leadership.
In turn, I apply these teachings and ideas when I informally mentor the younger engineers on my team. I encourage them to tackle problems independently by providing the necessary background knowledge and allowing them the autonomy to make decisions. I guide them when needed, but I believe in balance and the importance of learning through one’s own mistakes.
Li with her leadership mentor, Maria So, at a Goddard “Taste of Asia” event celebrating Asian American, Native Hawaiian and Pacific Islander Heritage Month. “Her influence has been profound,” Li said. “She has guided me and acted as a sounding board for some very exciting but challenging decisions these past years. She also taught me the importance of seeing the bigger picture and the critical organizational leadership role to systems engineering, which has shaped my approach to leadership.”Photo courtesy Xiaoyi Li What is your involvement with the Asian American Native Hawaiian and Pacific Islander Employee Resource Group (AANHPI)?
I have been actively involved with the group, and I recently served as co-chair for three years. Our group is dedicated to advocating for the wellness of the Asian American community within Goddard. Our group also addresses any concerns from the community members by reporting directly to Goddard senior management. In addition, we foster a sense of community and support among members through community events including our annual “Taste of Asia and the Pacific Islands” lunch event at Goddard.
What do you do for fun?
I enjoy cooking a variety of cuisines, including Chinese and Thai (which I learned in Australia), as well as classic American dishes. My favorite culinary challenge is a rib roast using suis vide method, which involves 18 hours of slow cooking before finishing it in the oven! Additionally, I enjoy playing video games with my family and friends, which is a great way to relax and connect.
By Elizabeth M. Jarrell
NASA’s Goddard Space Flight Center, Greenbelt, Md.
Conversations With Goddard is a collection of Q&A profiles highlighting the breadth and depth of NASA’s Goddard Space Flight Center’s talented and diverse workforce. The Conversations have been published twice a month on average since May 2011. Read past editions on Goddard’s “Our People” webpage.
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Last Updated Aug 14, 2024 EditorRob GarnerContactRob Garnerrob.garner@nasa.govLocationGoddard Space Flight Center Related Terms
People of Goddard DAVINCI (Deep Atmosphere Venus Investigation of Noble gases, Chemistry, and Imaging) Geospace Dynamics Constellation (GDC) People of NASA View the full article
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