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By NASA
NASA Goddard MODIS Rapid Response Team During the morning of March 20, 2015, a total solar eclipse was visible from parts of Europe, and a partial solar eclipse from northern Africa and northern Asia. NASA’s Terra satellite passed over the Arctic Ocean on March 20 at 10:45 UTC (6:45 a.m. EDT) and captured the eclipse’s shadow over the clouds in the Arctic Ocean.
Terra launched 25 years ago on Dec. 18, 1999. Approximately the size of a small school bus, the Terra satellite carries five instruments that take coincident measurements of the Earth system: Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), Clouds and Earth’s Radiant Energy System (CERES), Multi-angle Imaging Spectroradiometer (MISR), Measurements of Pollution in the Troposphere (MOPITT), and Moderate Resolution Imaging Spectroradiometer (MODIS).
On Nov. 28, 2024, one of Terra’s power-transmitting shunt units failed. A response team reviewed Terra’s status and discussed potential impacts and options. Consequently, the team placed ASTER into Safe Mode. As a result, ASTER data are not currently being collected. All other instruments continue uninterrupted.
Image Credit: NASA Goddard MODIS Rapid Response Team
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By NASA
5 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Data from the SWOT satellite was used to calculate average water levels for lakes and reservoirs in the Ohio River Basin from July 2023 to November 2024. Yellow indicates values greater than 1,600 feet (500 meters) above sea level; dark purple represents water levels less than 330 feet (100 meters). Data from the U.S.-European Surface Water and Ocean Topography mission gives researchers a detailed look at lakes and reservoirs in a U.S. watershed.
The Ohio River Basin stretches from Pennsylvania to Illinois and contains a system of reservoirs, lakes, and rivers that drains an area almost as large as France. Researchers with the SWOT (Surface Water and Ocean Topography) mission, a collaboration between NASA and the French space agency CNES (Centre National d’Études Spatiales), now have a new tool for measuring water levels not only in this area, which is home to more than 25 million people, but in other watersheds around the world as well.
Since early 2023, SWOT has been measuring the height of nearly all water on Earth’s surface — including oceans, lakes, reservoirs, and rivers — covering nearly the entire globe at least once every 21 days. The SWOT satellite also measures the horizontal extent of water in freshwater bodies. Earlier this year, the mission started making validated data publicly available.
“Having these two perspectives — water extent and levels — at the same time, along with detailed, frequent coverage over large areas, is unprecedented,” said Jida Wang, a hydrologist at the University of Illinois Urbana-Champaign and a member of the SWOT science team. “This is a groundbreaking, exciting aspect of SWOT.”
Researchers can use the mission’s data on water level and extent to calculate how the amount of water stored in a lake or reservoir changes over time. This, in turn, can give hydrologists a more precise picture of river discharge — how much water moves through a particular stretch of river.
The visualization above uses SWOT data from July 2023 to November 2024 to show the average water level above sea level in lakes and reservoirs in the Ohio River Basin, which drains into the Mississippi River. Yellow indicates values greater than 1,600 feet (500 meters), and dark purple represents water levels less than 330 feet (100 meters). Comparing how such levels change can help hydrologists measure water availability over time in a local area or across a watershed.
Complementing a Patchwork of Data
Historically, estimating freshwater availability for communities within a river basin has been challenging. Researchers gather information from gauges installed at certain lakes and reservoirs, from airborne surveys, and from other satellites that look at either water level or extent. But for ground-based and airborne instruments, the coverage can be limited in space and time. Hydrologists can piece together some of what they need from different satellites, but the data may or may not have been taken at the same time, or the researchers might still need to augment the information with measurements from ground-based sensors.
Even then, calculating freshwater availability can be complicated. Much of the work relies on computer models. “Traditional water models often don’t work very well in highly regulated basins like the Ohio because they have trouble representing the unpredictable behavior of dam operations,” said George Allen, a freshwater researcher at Virginia Tech in Blacksburg and a member of the SWOT science team.
Many river basins in the United States include dams and reservoirs managed by a patchwork of entities. While the people who manage a reservoir may know how their section of water behaves, planning for water availability down the entire length of a river can be a challenge. Since SWOT looks at both rivers and lakes, its data can help provide a more unified view.
“The data lets water managers really know what other people in these freshwater systems are doing,” said SWOT science team member Colin Gleason, a hydrologist at the University of Massachusetts Amherst.
While SWOT researchers are excited about the possibilities that the data is opening up, there is still much to be done. The satellite’s high-resolution view of water levels and extent means there is a vast ocean of data that researchers must wade through, and it will take some time to process and analyze the measurements.
More About SWOT
The SWOT satellite was jointly developed by NASA and CNES, with contributions from the Canadian Space Agency (CSA) and the UK Space Agency. NASA’s Jet Propulsion Laboratory, managed for the agency by Caltech in Pasadena, California, leads the U.S. component of the project. For the flight system payload, NASA provided the Ka-band radar interferometer (KaRIn) instrument, a GPS science receiver, a laser retroreflector, a two-beam microwave radiometer, and NASA instrument operations. The Doppler Orbitography and Radioposition Integrated by Satellite system, the dual frequency Poseidon altimeter (developed by Thales Alenia Space), the KaRIn radio-frequency subsystem (together with Thales Alenia Space and with support from the UK Space Agency), the satellite platform, and ground operations were provided by CNES. The KaRIn high-power transmitter assembly was provided by CSA.
To learn more about SWOT, visit:
https://swot.jpl.nasa.gov
News Media Contacts
Jane J. Lee / Andrew Wang
Jet Propulsion Laboratory, Pasadena, Calif.
818-354-0307 / 626-379-6874
jane.j.lee@jpl.nasa.gov / andrew.wang@jpl.nasa.gov
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Last Updated Dec 17, 2024 Related Terms
SWOT (Surface Water and Ocean Topography) Jet Propulsion Laboratory Water on Earth Explore More
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By European Space Agency
Launched in May 2024, ESA’s EarthCARE satellite is nearing the end of its commissioning phase with the release of its first data on clouds and aerosols expected early next year. In the meantime, an international team of scientists has found an innovative way of applying artificial intelligence to other satellite data to yield 3D profiles of clouds.
This is particularly news for those eagerly awaiting data from EarthCARE in their quest to advance climate science.
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By European Space Agency
A pair of spacecraft were launched together today from India with the potential to change the nature of future space missions. ESA’s twin Proba-3 platforms will perform precise formation flying down to a single millimetre, as if they were one single giant spacecraft. To demonstrate their degree of control, the pair will produce artificial solar eclipses in orbit, giving prolonged views of the Sun’s ghostly surrounding atmosphere, the corona.
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By NASA
When Ariel Vargas joined NASA in 2023, he knew he wanted to make an impact. Despite his relatively short tenure, he has earned the reputation of a Digital Transformer in his work as a Network and ICAM (Identity, Credential, and Access Management) Service Integrator at Johnson Space Center (JSC). No matter the task at hand, Ariel is motivated by measurable transformation. “I wanted to have my fingerprint on something no matter what it was, big or small. To be able to see an impact,” he says. “And a lot of the things that I’m doing, both within my role and within Digital Transformation, I can see really flourishing already.”
In his current role, Ariel oversees the integration and management of various network services to ensure compliance and smooth operation. This includes the modernization of NASA’s Voice over Internet Protocol (VoIP) to consolidate the agency’s telephone systems and enhance wireless communications. He is involved in rolling out wall-to-wall wireless and coverage improvements on campus at JSC. Ariel also spearheads efforts in streamlining communications across NASA by integrating new capabilities into familiar platforms like Microsoft Teams. With these projects in progress, he aims to foster a more flexible, collaborative work environment aligned with Digital Transformation’s goal of inclusive teaming.
Ariel appreciates the cultural side of Digital Transformation, particularly the challenges involved in pursuing constant innovation. He recognizes that growth “often requires a period of adjustment, especially for those encountering new tools or methods for the first time.” Ariel strives to ensure cohesive collaboration across teams and centers in establishing interoperable architectures, processes, and tools. His team measures the impact of their transformation efforts by several metrics, including increased network performance and adoption rates of new tools and technologies. For instance, the VoIP modernization initiative aims to remove 50% of telephones at NASA centers. Of the over 1300 users affected by the NASA-wide service shut-off of non-compliant phones at JSC, only 6% reported issues post-implementation. This reflected a positive and proactive collaboration with users on finding alternative solutions and embracing future innovations.
I really believe in embracing changes and innovation and driving impactful results, being able to see it.
Ariel Vargas
Network and ICAM (Identity, Credential, and Access Management) Service Integrator at Johnson Space Center (JSC)
Lynn Vernon, JSC’s Digital Transformation lead and Chief Engineer for IT, notes Ariel’s ability to engage with partners, understand their mission needs, and identify innovative solutions to barriers. “Ariel looks at things from a new perspective and is willing to ask ‘why’ or ‘why not.’ Why do we do it this way? Why not try this? He is consistently willing to explore new technologies and capabilities to transform the way we work,” says Lynn. Ariel’s passion for continuous improvement and learning positions him as a natural leader within the Digital Transformation community.
Ariel took a unique path to NASA and sees his prior experiences as building blocks toward becoming the Digital Transformer he is today. Although his upbringing in Florida near Cape Canaveral sparked an early interest in space, Ariel initially pursued pre-medicine after high school before transitioning into the Army. After his service, he joined NASA as an intern through the Department of Defense’s SkillBridge program, which offers career assistance to transitioning military personnel. His ability to learn NASA’s culture and demonstrate mission value quickly led to a full-time, civil servant position.
Between his initial interest in medicine, his service in the Army, and his current focus on digital transformation and technology, Ariel sees a common theme of problem-solving. “You have to figure out what the problem is, and you have to be up to date with the newest, the latest and greatest, to help solve these problems.” Ariel followed this thread to complete a master’s degree in computer science and is currently pursuing a doctorate in instructional design and performance technology. Even outside his work at NASA, Ariel pursues pathways that further his capacity as a champion of Digital Transformation initiatives.
Looking to the future, Ariel is excited by the possibility of supporting NASA’s space missions through AI and data integration. He is motivated by the prospect of seeing his current work make a difference in the near-term future. “I really believe in embracing changes and innovation and driving impactful results, being able to see it,” he says. Given his accomplishments of the past year, Ariel is well on his way to realizing the future he envisions.
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