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Last November, NASA and its European partners launched the Sentinel-6B satellite to improve hurricane forecasts, help protect infrastructure, and benefit commercial industries, including shipping. The satellite now is flying 30 seconds behind its predecessor, Sentinel-6 Michael Freilich. Both satellites are providing precise sea level height measurements during what oceanographers expect to be a historic El Niño, a naturally occurring oceanic phenomenon in which warmer-than-usual Pacific waters shift global weather patterns.

The two satellites make up the Copernicus Sentinel-6/Jason-CS (Continuity of Service) mission, the latest in a series of ocean-observing radar altimetry missions that have been monitoring Earth’s changing seas continuously since the early 1990s.

The data each satellite is collecting will not only allow scientists to better understand this year’s El Niño but will also help them create more accurate hurricane predictions.

“This El Niño was a late-bloomer,” said Josh Willis, Sentinel-6B’s project scientist at NASA’s Jet Propulsion Laboratory in Southern California. “It didn’t kick off until the middle of the year and is just now reaching a strength similar to what we’ve seen in the satellite record during significant El Niños in 1997 and 2015. We expect it to be big, and it’s already having big impacts.”

El Niños generally scramble weather patterns tied to rainfall and storms, including hurricanes. They also redistribute heat in the ocean, which affects sea level. Normally, Earth’s warmest ocean waters sit along the equator in the western Pacific. During El Niño, weakened winds, which usually blow westward along the equator, result in heat spreading east toward South America. The change in ocean heat shifts hurricane activity from the Atlantic to the Pacific Ocean.

Predicting hurricane strength

On July 15, Sentinel-6B began delivering low-latency data to scientists that could be used for weather predictions. That data will take some time to work its way into the research models on which meteorologists and climate scientists rely, but when it does, those improved models could save lives.

Data from Sentinel-6 satellite missions feeds into hurricane tracking algorithms used by federal and state agencies. Those predictions can activate disaster response efforts, mobilizing resources ranging from sandbag placement to National Guard activation. They also can lead to evacuation orders that require quick but well-informed decisions about logistics at a local level. More severe events may require engaging larger organizations, such as the Federal Emergency Management Agency.

A tropical storm can take a week or more to become a hurricane and make its way to a coastline, but a hurricane can rapidly intensify in the 48 hours prior to landfall, leaving planners little time to prepare.

“Hurricanes have been known to speed up quickly at the last moment, so the window in which to decide what to do is short,” said Deirdre Byrne, an oceanographer and altimetry expert with the National Oceanic and Atmospheric Administration (NOAA). “The goal is to forecast how much and how rapidly intensification will happen so that officials can make the right calls.”

Byrne oversees one of the country’s most crucial hurricane forecasting algorithms, NOAA’s Satellite Ocean Heat Content Suite, which has been operating since 2012.

Each Sentinel-6 satellite measures ocean height, as well as the size of waves and marine wind speed, using a radar altimeter, which bounces thousands of radar pulses a second off the crests and troughs of waves. Ocean height varies from place to place and provides insight into the ocean’s heat content, since warm water expands. That, in turn, helps forecast how fast hurricanes will grow.

The satellites each carry a second instrument, called the Global Navigation Satellite System – Radio Occultation (GNSS-RO), which measures atmospheric properties, such as humidity, pressure, and temperature.

Among the measurements Sentinel-6 is gathering, Byrne is most anticipating the ocean height data, which she plans to begin incorporating into the current Satellite Ocean Heat Content Suite algorithm by the end of the year.

“In terms of data quality, the Sentinel-6 missions are unparalleled,” Byrne said.

Together, the missions are also extending a precise dataset deep into its fourth decade. This record of sea level observations traces back to the TOPEX/Poseidon mission, which launched in 1992, and continues through to the present day with Sentinel-6 Michael Freilich. Sentinel-6B will take over for its predecessor as the reference satellite for global sea level measurements later this year.

“The key is consistency, measuring the same way, every time,” said Severine Fournier, Sentinel-6B deputy project scientist, JPL. “That’s what lets us predict hurricanes, and, in turn, protect coastal communities and infrastructure.”

More about Sentinel-6B

Sentinel-6 Michael Freilich, named after a former director of NASA’s Earth Science Division, is one of two satellites that compose the Copernicus Sentinel-6/Jason-CS mission.

Sentinel-6/Jason-CS, a part of the European Union’s Earth observation program called Copernicus, was jointly developed by ESA (European Space Agency), EUMETSAT (European Organisation for the Exploitation of Meteorological Satellites), NASA, and NOAA, with funding support from the European Commission and technical support on performance from the French space agency CNES (Centre National d’Études Spatiales). Spacecraft monitoring and control, as well as the processing of all the altimeter science data, is carried out by EUMETSAT on behalf of the European Union’s Copernicus Programme, with the support of all partner agencies.

NASA JPL, a division of Caltech in Pasadena, contributed three science instruments for each Sentinel-6 satellite: the Advanced Microwave Radiometer, the GNSS-RO, and the Laser Retroreflector Array. NASA also contributed launch services, ground systems supporting operation of the agency’s science instruments, the science data processors for two of these instruments, and support for the United States members of the international Ocean Surface Topography Science Team.

For more about Sentinel-6B, visit:

https://science.nasa.gov/mission/sentinel-6B

-end-

Media Contacts

Andrew Good / Andrew Wang
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-2433 / 626-379-6874
andrew.c.good@jpl.nasa.gov / andrew.wang@jpl.nasa.gov

2026-060

The crew of NASA’s Artemis II mission – NASA astronauts Christina Koch, Victor Glover, and Reid Wiseman and CSA (Canadian Space Agency) astronaut Jeremy Hansen – visited Huntsville, Alabama, Sept. 1, 2026, where they met with the NASA workforce at NASA’s Marshall Space Flight Center. The event gave the crew an opportunity to share firsthand experiences from their mission, reflect on their time in space, and connect with the workforce that supported the mission through an engaging question-and-answer session.

Image credit: NASA/Brandon Hancock

Following their landmark Artemis II mission earlier this year, distinguished NASA astronauts Victor Glover and Reid Wiseman are transitioning in September to emeritus status at the agency’s Johnson Space Center in Houston.

In an emeritus role, individuals with a high degree of technical and professional knowledge can continue to support the agency by donating their time to train and mentor the current workforce. This allows the agency to maintain access to top talent in a specialized consultant role, while simultaneously providing the individual with the flexibility to pursue other opportunities.

“I’ve had the privilege of knowing Reid and Victor for years, and both exemplify the leadership, character, and commitment that define NASA at its best.” said NASA Administrator Jared Isaacman. “Reid commanded Artemis II after previously spending 165 days aboard the International Space Station, while Victor brought his experience as a naval aviator, test pilot, and Crew-1 astronaut to his role as pilot. Together, they took on one of the most challenging missions in human spaceflight and helped return America to the lunar environment. As Reid and Victor transition to emeritus status, I’m grateful they will continue sharing what they learned with our astronauts, flight controllers, and engineers as we prepare for Artemis III in 2027 and the missions that follow.”

Glover will support aerospace, leadership, and public service efforts as he transitions within and outside of NASA. He’s committed to transferring his knowledge of Orion and its spacecraft systems, among other expertise, to future Artemis missions.

“As I grow into this new role, NASA and spaceflight remain a meaningful part of my journey of service,” said Glover. “I’m excited to keep uplifting my friends and cheering them on as they reach for the Moon. Together, we’ll keep pushing boundaries and inspiring the next giant leap.”

Wiseman is set to share his spaceflight experience with colleagues ahead of the agency’s Artemis III mission in low Earth orbit to test rendezvous and docking capabilities between Orion and commercial human landing systems.

“There is no better place to work, and there are no better people to work with, than those in this agency,” said Wiseman. “NASA gave me tremendous responsibility, supported me through two space missions, and my time as chief astronaut, and was always there for my family when we needed it most. I’m thrilled to continue serving future missions and programs through the emeritus program.”

“Reid and Victor’s commitment to exploration, steady leadership, and service to our astronaut corps and our nation have made a lasting impact,” said Vanessa Wyche, director of NASA’s Johnson Space Center in Houston. “Throughout their careers, they have each brought excellence, humility, and purpose to every role they have held at NASA. Their contributions have helped advance our mission and inspire those around them, leaving a legacy that will continue to shape the future of human spaceflight. We are immeasurably grateful for all they have given to NASA and are glad that this is not the end of their journey with the agency.”

“Reid and Victor are trusted teammates whose professionalism, calm leadership, and unwavering commitment to NASA have strengthened our office and inspired everyone around them,” said Scott Tingle, chief of the Astronaut Office at Johnson. “As they transition into their emeritus roles, they leave a legacy of operational excellence that will continue shaping the astronaut corps for years to come. We’re grateful that they will still be part of our community, sharing their experience and insight as they begin this next chapter.”

Among their many accomplishments at NASA, as Artemis II crew members, Glover and Wiseman were two of the four astronauts to first launch on top NASA’s SLS (Space Launch System) rocket aboard the Orion spacecraft for a mission around the Moon. Following a 10-day mission with crewmates NASA astronaut Christina Koch and CSA (Canadian Space Agency) astronaut Jeremy Hansen, they safely splashed down on April 10 as the first humans to travel to lunar orbit in more than 50 years, ultimately flying farther in space than anyone had before.

Support and knowledge transfer from both Glover and Wiseman is critical for the upcoming Artemis III mission as NASA prepares to return American astronauts to the lunar surface on the Artemis IV mission in 2028.

To learn more about NASA astronauts, visit:

https://www.nasa.gov/astronauts

-end-

George Alderman / Cheryl Warner
Headquarters, Washington
202-356-1600
george.a.alderman@nasa.gov / cheryl.m.warner@nasa.gov

Written by William Farrand, Senior Research Scientist, Space Science Institute

Earth planning date: Friday, Aug. 28, 2026

The span of sols spanned by this blog post is noteworthy in several ways. First, Curiosity became a world-class (for Mars at least) mountaineer by passing the 1 kilometer mark of elevation from its landing site on the floor of Gale crater. This writer was on the Mars Exploration Rover science team and we were excited when the Spirit rover got to the top of Husband Hill in Gusev crater in August 2005. But that was a climb of 106 meters (about 348 feet) above its landing site, and Curiosity has passed 1000 meters (about 0.62 miles). 

Second, Saturday, Aug. 29, marked 5,000 Martian days (or sols) since Curiosity landed on Mars (that’s more than 5,137 Earth days, because a day on Mars lasts 24.6 hours). Congratulations are in order to the engineers and scientists who have made this landmark possible. 

Finally, in terms of its science activities Curiosity is examining a wind-formed, long, narrow, large ripple which has been named “Chocolatal.” Further examination will help determine if this feature could be classified as a “transverse aeolian ridge” or TAR. TARs have been observed across the Martian surface based on orbital imaging. The long axis of a TAR is oriented perpendicular to the local predominant wind direction. While this is not the first potential TAR that has been examined by Curiosity, its location, higher on the slopes of Mount Sharp invites questions about whether it will be composed of the same types of granular materials found in the lower TARs, or whether it has a different range of grain sizes and/or layering. 

Other questions to be addressed include how the ridge formed, whether it is active, how it has migrated, and, if it is immobile, then how has it stabilized?

At the start of the planning week, Curiosity was en route to the sand ripple and encountered interesting science targets along the way. In Monday’s two-sol plan, in-situ examinations were planned of the light-toned bedrock occurring along the rover’s path. Some of the rocks encountered near the rover had dark-toned thick coatings or remnant layers, and these were targeted for chemical examination by the rover’s ChemCam Laser Induced Breakdown Spectroscopy (LIBS) instrument. Mastcam and ChemCam Remote Micro Imager (RMI) mosaics were planned, for layers in buttes along the rover’s path, and on more distant sets of sand ripples.

A midweek planning session took advantage of the last drive, leaving the rover only a few meters from Chocolatal. ChemCam was able to target sand at the base of Chocolatal as well as nearby bedrock. Stand-off Mastcam high-resolution image mosaics of the ripple were also targeted. The drive planned midweek took the rover right into Chocolatal with one of its wheels and then backing off a little, so in the end-of-week plan, contact science could be planned within the trenched region.

The final planning session of the week, which extended through the landmark Sol 5000, involved MAHLI mosaics of the right wall of the trench to see if there is layering, and to assess any variations in grain size. It’s noteworthy that these MAHLI mosaics are being named in honor of our late colleague Paul Geissler, who was one of the foremost experts on the study of Martian TARs and who was working with the MAHLI team before his untimely passing earlier in the year. In-situ APXS measurements were planned of the coarse-grained surface of the ripple, and ChemCam LIBS measurements were planned on the top of Chocolatal, a sinuous feature looking like a “mohawk” haircut (see the accompanying image). LIBS was also planned on a dark band on its flank and at the back of the scuff/trench. Other activities in the three-sol plan included Mastcam mosaics, an AM Navcam dust-devil survey, Navcam suprahorizon survey, and APXS atmospheric measurements.

With 5000 sols of outstanding scientific accomplishments, the Curiosity science and engineering team looks forward to the next 5000 sols.

Eruptions are a regular occurrence at Anak Krakatau, a small volcano between the Indonesian islands of Java and Sumatra. Much of its activity remains relatively mild, but it occasionally puts on more impressive and hazardous shows of force. In early September 2026, a booming eruption lasting more than 24 hours sent gas and ash high into the atmosphere, disrupting thousands of flights and degrading air quality in parts of the country, including the capital city of Jakarta.

Satellites passing over the area during the eruption on September 5 captured images of the explosive activity. In the scene above, acquired with the OLI (Operational Land Imager) on the NASA-USGS Landsat 8 satellite, a white plume of volcanic gas billows over a brown ash cloud. Below, a wider view captured by the VIIRS (Visible Infrared Imaging Radiometer Suite) on the Suomi NPP satellite shows the volcanic material dispersing over a large area.

Indonesia’s meteorological agency reported that ash had reached altitudes up to 6,000 meters (20,000 feet) to the east of the volcano and 15,000 meters (50,000 feet) to the west by September 6. The presence of ash in the atmosphere prompted the temporary closure of eight airports on Java and Sumatra, disrupting nearly 3,000 flights in and out of the area, according to news reports.

Ashfall affected populated areas, particularly to the east of Anak Krakatau in Jakarta and other parts of West Java, the Indonesian Humanitarian Coordination Platform (IHCP) reported. Volcanic ash poses health risks to people and can irritate the respiratory tract, eyes, and skin. However, this air quality hazard differs from the smoke produced by peatland fires elsewhere in the country in terms of particle characteristics, dispersal patterns, and protection measures, the IHCP noted. 

On September 6, the continuous explosive eruption from Anak Krakatau subsided, though the volcano kept rumbling. It returned to a more typical pattern of Strombolian eruptions, characterized by intermittent spurts of ash and volcanic material. Airports had resumed operation by September 8, but the volcano remained at the second-highest alert level on the country’s scale, as it has been since early July.

NASA Earth Observatory images by Michala Garrison, using Landsat data from the U.S. Geological Survey, and VIIRS data from NASA EOSDIS LANCE, GIBS/Worldview, and the Suomi National Polar-orbiting Partnership. Story by Lindsey Doermann.

References & Resources

• ABC News (2026, September 7) Flights to and from Indonesia’s capital resume after volcanic eruption forced a 2-day closure. Accessed September 8, 2026.
• BBC (2026, September 8) Indonesia airports reopen after volcano eruption leaves 340,000 stranded. Accessed September 8, 2026.
• BMKG (2026, September 7) Imbas Sebaran Abu Vulknaik Anak Krakatau, 8 Bandara Ditutup Sementara, BMKG Minta Waspada dan Tenang. Accessed September 8, 2026.
• BMKG (2026, September 6) BMKG Terus Pantau Dampak Erupsi Gunung Anak Krakatau. Accessed September 8, 2026.
• Global Volcanism Program (2026) Krakatau. Accessed September 8, 2026.
• Indonesia Humanitarian Coordination Platform (2026, September 6) Anak Krakatau Eruption, Volcanic Ashfall and Concurrent Forest Fire & Haze Situation. Accessed September 8, 2026.
• NASA Earth Observatory, Anak Krakatau. Accessed September 8, 2026.

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