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By NASA
5 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
A ship plows through rough seas in the Bering Sea in the aftermath of Typhoon Tip, one of the largest hurricanes on record. The Sentinel-6B satellite will provide data crucial to forecasting sea states, information that can help ships avoid danger. CC BY 2.0 NOAA/Commander Richard Behn Sea surface height data from the Sentinel-6B satellite, led by NASA and ESA, will help with the development of marine weather forecasts, alerting ships to possible dangers.
Because most global trade travels by ship, accurate, timely ocean forecasts are essential. These forecasts provide crucial information about storms, high winds, and rough water, and they depend on measurements provided by instruments in the ocean and by satellites including Sentinel-6B, a joint mission led by NASA and ESA (European Space Agency) that will provide essential sea level and other ocean data after it launches this November.
The satellite will eventually take over from its twin, Sentinel-6 Michael Freilich, which launched in 2020. Both satellites have an altimeter instrument that measures sea levels, wind speeds, and wave heights, among other characteristics, which meteorologists feed into models that produce marine weather forecasts. Those forecasts provide information on the state of the ocean as well as the changing locations of large currents like the Gulf Stream. Dangerous conditions can result when waves interact with such currents, putting ships at risk.
“Building on NASA’s long legacy of satellite altimetry data and its real-world impact on shipping operations, Sentinel-6B will soon take on the vital task of improving ocean and weather forecasts to help keep ships, their crews, and cargo safe”, said Nadya Vinogradova Shiffer, lead program scientist at NASA Headquarters in Washington.
Sentinel-6 Michael Freilich and Sentinel-6B are part of the Sentinel-6/Jason-CS (Continuity of Service) mission, the latest in a series of ocean-observing radar altimetry missions that have monitored Earth’s changing seas since the early 1990s. Sentinel-6/Jason-CS is a collaboration between NASA, ESA, the European Union, EUMETSAT (European Organisation for the Exploitation of Meteorological Satellites), and NOAA (U.S. National Oceanic and Atmospheric Administration). The European Commission provided funding support, and the French space agency CNES (Centre National d’Études Spatiales) contributed technical support.
Keeping current
“The ocean is getting busier, but it’s also getting more dangerous,” said Avichal Mehra, deputy director of the Ocean Prediction Center at the National Weather Service in College Park, Maryland. He and his colleagues produce marine weather forecasts using data from ocean-based instruments as well as complementary measurements from five satellites, including Sentinel-6 Michael Freilich. Among those measurements: sea level, wave height, and wind speed. The forecasters derive the location of large currents from changes in sea level.
One of the planet’s major currents, the Gulf Stream is located off the southeastern coast of the United States, but its exact position varies. “Ships will actually change course depending on where the Gulf Stream is and the direction of the waves,” said Mehra. “There have been instances where, in calm conditions, waves interacting with the Gulf Stream have caused damage or the loss of cargo containers on ships.”
Large, warm currents like the Gulf Stream can have relatively sharp boundaries since they are generally higher than their surroundings. Water expands as it warms, so warm seawater is taller than cooler water. If waves interact with these currents in a certain way, seas can become extremely rough, presenting a hazard to even the largest ships.
“Satellite altimeters are the only reliable measurement we have of where these big currents can be,” said Deirdre Byrne, sea surface height team lead at NOAA in College Park.
There are hundreds of floating sensors scattered about the ocean that could pick up parts of where such currents are located, but these instruments are widely dispersed and limited in the area they measure at any one time. Satellites like Sentinel-6B offer greater spatial coverage, measuring areas that aren’t regularly monitored and providing essential information for the forecasts that ships need.
Consistency is key
Sentinel-6B won’t just help marine weather forecasts through its near-real-time data, though. It will also extend a long-term dataset featuring more than 30 years of sea level measurements, just as Sentinel-6 Michael Freilich does today.
“Since 1992, we have launched a series of satellites that have provided consistent sea level observations from the same orbit in space. This continuity allows each new mission to be calibrated against its predecessors, providing measurements with centimeter-level accuracy that don’t drift over time,” said Severine Fournier, Sentinel-6B deputy project scientist at NASA’s Jet Propulsion Laboratory in Southern California.
This long-running, repeated measurement has turned this dataset into the gold standard sea level measurement from space — a reference against which data from other sea level satellites is checked. It also serves as a baseline, giving forecasters a way to tell what ocean conditions have looked like over time and how they are changing now. “This kind of data can’t be easily replaced,” said Mehra.
More about Sentinel-6B
Sentinel-6/Jason-CS was jointly developed by ESA, EUMETSAT, NASA, and NOAA, with funding support from the European Commission and technical support from CNES.
A division of Caltech in Pasadena, JPL contributed three science instruments for each Sentinel-6 satellite: the Advanced Microwave Radiometer, the Global Navigation Satellite System – Radio Occultation, and the Laser Retroreflector Array. NASA is also contributing launch services, ground systems supporting operation of the NASA science instruments, the science data processors for two of these instruments, and support for the U.S. members of the international Ocean Surface Topography and Sentinel-6 science teams.
For more about Sentinel-6/Jason-CS, visit:
https://sealevel.jpl.nasa.gov/missions/jason-cs-sentinel-6
News Media Contacts
Jane J. Lee / Andrew Wang
Jet Propulsion Laboratory, Pasadena, Calif.
626-491-1943 / 626-379-6874
jane.j.lee@jpl.nasa.gov / andrew.wang@jpl.nasa.gov
2025-116
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Last Updated Sep 11, 2025 Related Terms
Sentinel-6B Jason-CS (Continuity of Service) / Sentinel-6 Jet Propulsion Laboratory Oceans Weather and Atmospheric Dynamics Explore More
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6 Min Read Upcoming Launch to Boost NASA’s Study of Sun’s Influence Across Space
Soon, there will be three new ways to study the Sun’s influence across the solar system with the launch of a trio of NASA and National Oceanic and Atmospheric Administration (NOAA) spacecraft. Expected to launch no earlier than Tuesday, Sept. 23, the missions include NASA’s IMAP (Interstellar Mapping and Acceleration Probe), NASA’s Carruthers Geocorona Observatory, and NOAA’s SWFO-L1 (Space Weather Follow On-Lagrange 1) spacecraft.
The three missions will launch together aboard a SpaceX Falcon 9 rocket from NASA’s Kennedy Space Center in Florida. From there, the spacecraft will travel together to their destination at the first Earth-Sun Lagrange point (L1), around one million miles from Earth toward the Sun.
The missions will each focus on different effects of the solar wind — the continuous stream of particles emitted by the Sun — and space weather — the changing conditions in space driven by the Sun — from their origins at the Sun to their farthest reaches billions of miles away at the edge of our solar system. Research and observations from the missions will help us better understand the Sun’s influence on Earth’s habitability, map our home in space, and protect satellites and voyaging astronauts and airline crews from space weather impacts.
The IMAP and Carruthers missions add to NASA’s heliophysics fleet of spacecraft. Together, NASA’s heliophysics missions study a vast, interconnected system from the Sun to the space surrounding Earth and other planets to the farthest limits of the Sun’s constantly flowing streams of solar wind. The SWFO-L1 mission, funded and operated by NOAA, will be the agency’s first satellite designed specifically for and fully dedicated to continuous, operational space weather observations.
Mapping our home in space: IMAP
The IMAP mission will study the heliosphere, our home in space.
NASA/Princeton University/Patrick McPike As a modern-day celestial cartographer, IMAP will investigate two of the most important overarching issues in heliophysics: the interaction of the solar wind at its boundary with interstellar space and the energization of charged particles from the Sun.
The IMAP mission will principally study the boundary of our heliosphere — a huge bubble created by the solar wind that encapsulates our solar system — and study how the heliosphere interacts with the local galactic neighborhood beyond. The heliosphere protects the solar system from dangerous high-energy particles called galactic cosmic rays. Mapping the heliosphere’s boundaries helps scientists understand our home in space and how it came to be habitable.
“IMAP will revolutionize our understanding of the outer heliosphere,” said David McComas, IMAP mission principal investigator at Princeton University in New Jersey. “It will give us a very fine picture of what’s going on out there by making measurements that are 30 times more sensitive and at higher resolution than ever before.”
The IMAP mission will also explore and chart the vast range of particles in interplanetary space. The spacecraft will provide near real-time observations of the solar wind and energetic particles, which can produce hazardous conditions not only in the space environment near Earth, but also on the ground. The mission’s data will help model and improve prediction capabilities of the impacts of space weather ranging from power-line disruptions to loss of satellites.
Imaging Earth’s exosphere: Carruthers Geocorona Observatory
An illustration shows the Carruthers Geocorona Observatory spacecraft. NASA/BAE Systems Space & Mission Systems The Carruthers Geocorona Observatory, a small satellite, will launch with IMAP as a rideshare. The mission was named after Dr. George Carruthers, creator of the Moon-based telescope that captured the first images of Earth’s exosphere, the outermost layer of our planet’s atmosphere.
The Carruthers mission will build upon Dr. Carruthers’ legacy by charting changes in Earth’s exosphere. The mission’s vantage point at L1 offers a complete view of the exosphere not visible from the Moon’s relatively close distance to Earth. From there, it will address fundamental questions about the nature of the region, such as its shape, size, density, and how it changes over time.
The exosphere plays an important role in Earth’s response to space weather, which can impact our technology, from satellites in orbit to communications signals in the upper atmosphere or power lines on the ground. During space weather storms, the exosphere mediates the energy absorption and release throughout the near-Earth space environment, influencing strength of space weather disturbances. Carruthers will help us better understand the fundamental physics of our exosphere and improve our ability to predict the impacts of the Sun’s activity.
“We’ll be able to create movies of how this atmospheric layer responds when a solar storm hits, and watch it change with the seasons over time,” said Lara Waldrop, the principal investigator for the Carruthers Geocorona Observatory at the University of Illinois at Urbana-Champaign.
New space weather station: SWFO-L1
SWFO-L1 will provide real-time observations of the Sun’s corona and solar wind to help forecast the resulting space weather.
NOAA/BAE Systems Space & Mission Systems Distinct from NASA’s research satellites, SWFO-L1 will be an operational satellite, designed to observe solar activity and the solar wind in real time to provide critical data in NOAA’s mission to protect the nation from environmental hazards. SWFO-L1 will serve as an early-warning beacon for potentially damaging space weather events that could impact our technology on Earth. SWFO-L1 will observe the Sun’s outer atmosphere for large eruptions, called coronal mass ejections, and measure the solar wind upstream from Earth with a state-of-the-art suite of instruments and processing system.
This mission is the first of a new generation of NOAA space weather observatories dedicated to 24/7 operations, working to avoid gaps in continuity.
“SWFO-L1 will be an amazing deep-space mission for NOAA,” said Dimitrios Vassiliadis, SWFO program scientist at NOAA. “Thanks to its advantageous location at L1, it will continuously monitor the solar atmosphere while measuring the solar wind and its interplanetary magnetic fields well before it impacts Earth — and transmit these data in record time.”
With SWFO-L1’s enhanced performance, unobstructed views, and minimal delay between observations and data return, NOAA’s Space Weather Prediction Center forecasters will give operators improved lead time required to take precautionary actions that protect vital infrastructure, economic interests, and national security on Earth and in space.
By Mara Johnson-Groh
NASA’s Goddard Space Flight Center, Greenbelt, Md.
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Last Updated Sep 04, 2025 Related Terms
Carruthers Geocorona Observatory (GLIDE) Heliophysics Heliosphere IMAP (Interstellar Mapping and Acceleration Probe) NOAA (National Oceanic and Atmospheric Administration) Solar Wind Space Weather The Sun The Sun & Solar Physics Explore More
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By NASA
NASA and Northrop Grumman are preparing to send the company’s next cargo mission to the International Space Station, flying research to support Artemis missions to the Moon and human exploration of Mars and beyond, while improving life on Earth. SpaceX’s Falcon 9 rocket will launch Northrop Grumman’s 23rd commercial resupply services mission to the orbiting laboratory.
The investigations aboard the Cygnus spacecraft aim to refine semiconductor crystals for next-generation technologies, reduce harmful microbes, improve medication production, and manage fuel pressure.
NASA, Northrop Grumman, and SpaceX are targeting launch in mid-September from Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida.
Read about some of the investigations traveling to the space station:
Better semiconductor crystals
Optical micrograph of a semiconductor composite wafer with embedded semimetal phases extracted from a space grown crystal in the SUBSA facility during Mission 1United Semiconductors LLC Researchers are continuing to fine-tune in-space production of semiconductor crystals, which are critical for modern devices like cellphones and computers.
The space station’s microgravity environment could enable large-scale manufacturing of complex materials, and leveraging the orbiting platform for crystal production is expected to lead to next-generation semiconductor technologies with higher performance, chip yield, and reliability.
“Semiconductor devices fabricated using crystals from a previous mission demonstrated performance gain by a factor of two and device yield enhanced by a factor of 10 compared to Earth-based counterparts,” said Partha S. Dutta, principal investigator, United Semiconductors LLC in Los Alamitos, California.
Dutta highlighted that three independent parties validated microgravity’s benefits for growing semiconductor crystals and that the commercial value of microgravity-enhanced crystals could be worth more than $1 million per kilogram (2.2 pounds).
Space-manufactured crystals could help meet the need for radiation-hardened, low-power, high-speed electronics and sensors for space systems. They also could provide reduced power use, increased speed, and improved safety. The technology also has ground applications, including electric vehicles, waste heat recovery, and medical tools.
Learn more about the SUBSA-InSPA-SSCug experiment.
Lethal light
Germicidal Ultraviolet (UV) light is emitted by an optical fiber running through the center of an agar plateArizona State University Researchers are examining how microgravity affects ultraviolet (UV) light’s ability to prevent the formation of biofilms — communities of microbes that form in water systems. Investigators developed special optical fibers to deliver the UV light, which could provide targeted, long-lasting, and chemical-free disinfection in space and on Earth.
“In any water-based system, bacterial biofilms can form on surfaces like pipes, valves, and sensors,” said co-investigator Paul Westerhoff, a professor at Arizona State University in Tempe. “This can cause serious problems like corrosion and equipment failure, and affect human health.”
The UV light breaks up DNA in microorganisms, preventing them from reproducing and forming biofilms. Preliminary evidence suggests biofilms behave differently in microgravity, which may affect how the UV light reaches and damages bacterial DNA.
“What we’ll learn about biofilms and UV light in microgravity could help us design safer water and air systems not just for space exploration, but for hospitals, homes, and industries back on Earth,” Westerhoff said.
Learn more about the GULBI experiment.
Sowing seeds for pharmaceuticals
NASA astronaut Loral O’Hara displays the specialized sample processor used for pharmaceutical research aboard the International Space StationNASA An investigation using a specialized pharmaceutical laboratory aboard the space station examines how microgravity may alter and enhance crystal structures of drug molecules. Crystal structure can affect the production, storage, effectiveness, and administration of medications.
“We are exploring drugs with applications in cardiovascular, immunologic, and neurodegenerative disease as well as cancer,” said principal investigator Ken Savin of Redwire Space Technologies in Greenville, Indiana. “We expect microgravity to yield larger, more uniform crystals.”
Once the samples return to Earth, researchers at Purdue University in West Lafayette, Indiana, will examine the crystal structures.
The investigators hope to use the space-made crystals as seeds to produce significant numbers of crystals on Earth.
“We have demonstrated this technique with a few examples, but need to see if it works in many examples,” Savin said. “It’s like being on a treasure hunt with every experiment.”
This research also helps enhance and expand commercial use of the space station for next-generation biotechnology research and in-space production of medications.
Learn more about the ADSEP PIL-11 experiment.
Keeping fuel cool
iss0NASA astronaut Joe Acaba installs hardware for the first effort in 2017 aboard the International Space Station to test controlling pressure in cryogenic fuel tanksNASA Many spacecraft use cryogenic or extremely cold fluids as fuel for propulsion systems. These fluids are kept at hundreds of degrees below zero to remain in a liquid state, making them difficult to use in space where ambient temperatures can vary significantly. If these fluids get too warm, they turn into gas and boiloff, or slowly evaporate and escape the tank, affecting fuel efficiency and mission planning.
A current practice to prevent this uses onboard fuel to cool systems before transferring fuel, but this practice is wasteful and not feasible for Artemis missions to the Moon and future exploration of Mars and beyond. A potential alternative is using special gases that do not turn into liquids at cold temperatures to act as a barrier in the tank and control the movement of the fuel.
Researchers are testing this method to control fuel tank pressure in microgravity. It could save an estimated 42% of propellant mass per year, according to Mohammad Kassemi, a researcher at NASA’s National Center for Space Exploration Research and Case Western Reserve University in Cleveland.
The test could provide insights that help improve the design of lightweight, efficient, long-term in-space cryogenic storage systems for future deep space exploration missions.
Learn more about the ZBOT-NC experiment.
Download high-resolution photos and videos of the research highlighted in this feature.
Learn more about the research aboard the International Space Station at:
www.nasa.gov/iss-science
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