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By NASA
Explore This Section Earth Earth Observer Editor’s Corner Feature Articles Meeting Summaries News Science in the News Calendars In Memoriam Announcements More Archives Conference Schedules Style Guide 13 min read
The Earth Observer Editor’s Corner: July–September 2025
NOTE TO READERS: After more than three decades associated with or directly employed by NASA, Steve Platnick [GSFC—Deputy Director for Atmospheres, Earth Sciences Division] stepped down effective August 8, 2025. Steve began his civil servant career at GSFC in 2002, but his GSFC association went back to 1993, first as a contractor and then as one of the earliest employees of the Joint Center for Earth Systems Technology (JCET). During his time at NASA, Steve played an integral role in the sustainability and advancement of NASA’s Earth Observing System platforms and data. He was actively involved in the Moderate Resolution Imaging Spectroradiometer (MODIS) Science Team, where he helped advance several key components of the MODIS instrument. He was also the NASA Lead/co-Lead for the Suomi National Polar-orbiting Partnership (Suomi NPP), Atmosphere Discipline from 2012–2020 where he focused on operational cloud optical and microphysical products.
In 2008, Steve became the Earth Observing System (EOS) Senior Project Scientist. In this role, he led the EOS Project Science Office that supported airborne sensors, ground networks, and calibration labs. The Kudos article titled “Steve Platnick Steps Down from NASA After 34 Years of Service” includes a more detailed account of Steve’s career and includes a list of awards he has received.
Steve’s departure leaves a vacancy in the author’s chair for “The Editor’s Corner” – another role Steve filled as EOS Senior Project Scientist. Barry Lefer [NASA Headquarters—Associate Director of Research, Earth Science Division] graciously agreed to serve as guest author of the editorial in the current compilation. I want to thank Steve for all his support for The Earth Observer over the years and thank Barry for stepping in as the author of “The Editor’s Corner” for the time being.
–Alan Ward, Executive Editor, The Earth Observer
I begin this editorial with news of a successful Earth science launch. At 5:40 PM Indian Standard Time (IST), or 8:10 AM Eastern Daylight Time (EDT), on July 30, 2025, the joint NASA–Indian Space Research Organization (ISRO) Synthetic Aperture Radar, or NISAR, mission launched from the Satish Dhawan Space Centre on India’s southeastern coast aboard an ISRO Geosynchronous Satellite Launch Vehicle (GSLV) rocket 5. The ISRO ground controllers began communicating with NISAR about 20 minutes after launch, at just after 8:29 AM EDT, and confirmed it is operating as expected.
NISAR will use two different radar frequencies (L-band SAR and S-band SAR) to penetrate clouds and forest canopies. Including L-band and S-band radars on one satellite is an evolution in SAR airborne and space-based missions that, for NASA, started in 1978 with the launch of Seasat. In 2012, ISRO began launching SAR missions starting with Radar Imaging Satellite (RISAT-1), followed by RISAT-1A in 2022, to support a wide range of applications in India.
Combining the data from these two radars will allow researchers to systematically and globally map Earth – measuring changes of our planet’s surface down to a centimeter (~0.4 inches). With this detailed view, researchers will have an unprecedented ability to observe and measure complex processes from ecosystem disturbances to natural hazards to groundwater issues. All NISAR science data will be freely available and open to the public.
Following the successful launch, NISAR entered an approximately 90-day commissioning phase to test out systems before science operations begin. A key milestone of that phase was the completion of the deployment of the 39-ft (12-m) radar antenna reflector on August 15 – see Video. The process began on August 9, when the satellite’s boom, which had been tucked close to its main body, started unfolding one joint at a time until it was fully extended about four days later. The reflector assembly is mounted at the end of the boom. On August 15, small explosive bolts that held the reflector assembly in place were fired, enabling the antenna to begin a process called the bloom – its unfurling by the release of tension stored in its flexible frame while stowed like an umbrella. Subsequent activation of motors and cables pulled the antenna into its final, locked position.
Video: NISAR mission team members at NASA JPL, working with colleagues in India, executed the deployment of the satellite’s radar antenna reflector on Aug. 15, 2025. About 39 feet (12 meters) in diameter, the reflector directs microwave pulses from NISAR’s two radars toward Earth and receives the return signals. Credit: NASA/JPL-Caltech The radar reflector will be used to direct and receive microwave signals from the two radars. By interpreting the differences between the L-band and S-band measurements, researchers will be able to discern characteristics about the surface below. As NISAR passes over the same locations twice every 12 days, scientists can evaluate how those characteristics have changed over time to reveal new insights about Earth’s dynamic surfaces.
With the radar reflector now in full bloom, scientists have turned their attention to tuning and testing the radar and preparing NISAR for Science Operations, which are anticipated to start around the beginning of November. Congratulations to the NISAR team on a successful launch and deployment of the radar reflector. Along with the science community, I am excited to see what new discoveries will result from the data collected by the first Earth System Observatory mission.
Turning now to news from active missions, the Soil Moisture Active Passive (SMAP) mission has collected over 10 years of global L-band radiometry observations that have resulted in surface soil moisture, vegetation optical depth (VOD), and freeze/thaw state estimates that outperform past and current products. A decade of SMAP soil moisture observations has led to scientific achievements, including quantifying the linkages of the three main metabolic cycles (e.g., carbon, water, and energy) on land. The data have been widely used by the Earth system science community to improve drought assessments and flood prediction as well as the accuracy of numerical weather prediction models.
SMAP’s Early Adopter program has helped connect SMAP data with people and organizations that need it. The program has increased the awareness of SMAP mission products, broadened the user community, increased collaboration with potential users, improved knowledge of SMAP data product capabilities, and expedited the distribution and uses of mission products for a suite of 16 products available. For example, the L-band VOD, which is related to water content in vegetation, is being used to better understand water exchanges in the soil–vegetation–atmosphere continuum.
The SMAP Active–Passive (AP) algorithm – based on data from SMAP and the European Copernicus Program Sentinel-1 C-band synthetic aperture radar (SAR) – will be adapted to work with L-band data from the newly launched NISAR mission. The result will be estimates of global soil moisture at a spatial resolution of 1 km (0.62 mi) or better approximately once per week.
In addition, the data collected during the SMAP mission would be continued and further enhanced by the European Union’s Copernicus Imaging Microwave Radiometer (CIMR) mission if it launches. This proposed multichannel microwave radiometry observatory includes L-band and four other microwave channels sharing a large mesh reflector – like the one used with SMAP. The plan calls for CIMR to follow a similar approach as SMAP for RFI detection and meet the instrument thermal noise and data latency of SMAP for next-mission desired characteristics.
To learn more about what SMAP has accomplished see “A Decade of Global Water Cycle Monitoring: NASA Soil Moisture Active Passive Mission.”
NASA’s Orbiting Carbon Observatory-2 (OCO-2) has been the “gold standard” for atmospheric carbon dioxide (CO2) observations from space for over a decade. The data returned from OCO-2 provide insights into plant health, forest management, forecasting crop yields, fire-risk models, and anticipating droughts.
OCO-3, constructed from spare parts left after OCO-2, was launched to the International Space Station (ISS) in 2019, where it has operated for over five years. OCO-3 extends the global CO2 measurement record while adding new capabilities made possible by being on ISS (e.g., detailed views of urban and tropical regions).
The overarching OCO mission hasn’t just about been about data and hardware. Although both those elements are parts of the story, the human stories woven through the mission’s successes and setbacks are really what holds the mission together. The feature, “A Tapestry of Tales: 10th Anniversary Reflections from NASA’s OCO-2 Mission,” sheds light on some of these personal stories from the OCO-2 and OCO-3 missions.
The individual tales contained in this article reveal the grit and determination behind the scenes of the success of OCO-2 and OCO-3, from the anxiety and excitement surrounding the launch of OCO-2, to moments of fieldwork in the Nevada desert, to internships where wildfire responders turned to OCO-2 data to improve fire-risk models. Taken together, these stories form a “tapestry” that reveals how the OCO-2 and OCO-3 missions continue to illuminate the dynamics of Earth’s atmosphere – one breath at a time.
These personal perspectives underscore that science is not just numbers; it’s people pushing boundaries, navigating failure, and inspiring ways to make our planet safer and healthier. In a time such as this, this is an important reminder.
The joint NASA–U.S. Geological Survey (USGS) Landsat program has been a cornerstone of Earth observation for over 50 years. On July 13, Landsat 9 collected its millionth image: a stunning shot of the Arctic National Wildlife Refuge in Alaska – see Figure. Landsat 9, the most recent satellite in the Landsat series, orbits Earth alongside Landsat 8. Together, these satellites collect invaluable data about Earth’s changing land surface every eight days.
Figure: This Landsat 9 image showing the Beaufort Sea shoreline off Alaska and Canada is just one of the scenes captured and processed on July 13, 2025— the same day the USGS EROS archive reached a milestone of one million Landsat 9 Level-1 products. This false color image was made with bands 6, 5, and 4 from the Operational Land Imager. This remote area allows the pristine wilderness environment to support a diverse wildlife and unique ecosystem that includes various species of mammals, birds, and fish. Landsat Level-1 products from Landsat 1 through Landsat 9 can be downloaded at no charge from a number of systems – visit the Landsat Data Access webpage to learn more. Credit: Public Domain After collecting more than 3.3 million images over the course of more than 26 years in orbit, Landsat 7 was decommissioned on June 4, 2025. A YouTube video released at the time of decommissioning provides a concise visual summary of the Landsat 7 mission’s achievements – and the technical challenges overcome. In addition, The Earth Observer did a feature for the 20th anniversary of Landsat 7 in the July–August 2019 issue, called “The Living Legacy of Landsat 7: Still Going Strong After 20 Years in Orbit” [Volume 31, Issue 4, pp. 4–14] that is a useful resource to learn more about the history and achievements (through 20 years) of the mission.
One of the strengths of the Landsat program is its potential for data integration with other satellites. The Harmonized Landsat and Sentinel-2 (HLS) product exemplifies this collaborative approach by combining data from Landsat 8 and 9 with data from the European Space Agency’s Copernicus Sentinel-2 A, B, and C missions. Whereas Landsat alone has a repeat time of eight days (i.e., combining Landsat 8 and 9 data); the combined HLS dataset provides imagery for the same location on Earth every 1.6 days – enabling researchers to monitor short-term changes in Earth’s land surface much more effectively than using Landsat or Sentinel-2 data alone.
HLS became one of the most-downloaded NASA data products in fiscal year 2024, with continued growth on the horizon. In February 2025, the program expanded with nine new vegetation indices based on HLS data, with historical processing back to 2013 scheduled for completion by early 2026. Low-latency HLS products will also be available in late 2026. For the full story of how HLS came to be – see the feature: “Harmonized Landsat and Sentinel-2: Collaboration Drives Innovation.”
Following a 13-month hibernation, the Global Ecosystem Dynamics Investigation (GEDI) mission was reinstalled to its original location aboard the ISS and resumed operations on April 22, 2024. Since this storage period, GEDI’s lasers have been operating nominally and the mission has continued to produce high-quality observations of the Earth’s three-dimensional structure, amassing 33 billion land surface returns as of November 27, 2024.
The mission team has been actively processing and releasing post-storage data to the public, with Version 2.1 – GEDI L1B, L2A, L2B, and L4A data products, which include data through November 2024, all available for download. The new L4C footprint-level Waveform Structural Complexity Index (WSCI) product using pre-storage data has also been released. Looking ahead, the team is preparing Version 3.0 (V3) of all data products, which will incorporate post-storage data while improving quality filtering, geolocation accuracy, and algorithm performance.
The 2025 GEDI Science Team Meeting (STM) brought together the mission science team, competed science team, representatives from the distributed active archive centers (DAACs), collaborators, stakeholders, and data users. Notably, it marked the first in-person gathering of the second competed science team, who shared updates on their research projects. The STM held an important space for brainstorming, knowledge-sharing, and discussion as the GEDI mission continues to flourish in its second epoch. To learn more, see “Summary of the 2025 GEDI Science Team Meeting.”
Shifting focus to the boreal forests of North America, the NASA Arctic–Boreal Vulnerability Experiment (ABoVE) is now in its final year, marking the end of a decade-long scientific endeavor that has transformed our understanding of environmental change in Alaska and western Canada. This ambitious campaign, funded primarily by NASA’s Terrestrial Ecology Program, has successfully progressed through three distinct phases: ecosystem dynamics (2015–2018), ecosystem services (2017–2022), and the current analysis and synthesis phase (2023–present).
As ABoVE approaches its conclusion, the program has grown to encompass 67 NASA-funded projects with over 1000 participating researchers – a testament to the collaborative scale required to address complex Arctic–boreal ecosystem questions. The program’s integrated approach, combining field research, airborne campaigns, and satellite remote sensing, has generated unprecedented insights into how environmental changes in these northern regions affect both vulnerable ecosystems and society.
The recent 11th – and final – ABoVE Science Team Meeting was an opportunity to showcase the program’s evolution from data collection to synthesis, highlighting successful community engagement initiatives, cutting-edge research on carbon dynamics and ecosystem responses, and innovative science communication strategies that have made this complex research accessible to diverse audiences. With synthesis activities now underway, ABoVE is positioned to deliver comprehensive insights that will inform Arctic and boreal research for years to come. To learn more, see “Summary of the 11th and Final ABoVE Science Team Meeting.”
Last but certainly not least, I want to both recognize and congratulate Compton J. Tucker [GSFC—Senior Researcher]. Compton retired from NASA in March 2025 after 48 years of public service, and then in April, was among 149 newly elected members to the National Academy of Sciences (NAS) – which is one of the highest honors in American science. This recognition from NAS brings Compton’s career full circle. He came to GSFC as a NAS postdoc before joining NASA as a civil servant. Compton is a pioneer in the field of satellite-based environmental analysis, using data from various Landsat missions and from the National Oceanographic and Atmospheric Administration’s (NOAA) Advanced Very High Resolution Radiometer (AVHRR) instrument. His research has focused on global photosynthesis on land, determining land cover, monitoring droughts and food security, and evaluating ecologically coupled disease outbreaks. The Kudos, “Compton J. Tucker Retires from NASA and is Named NAS Fellow,” provides more details about Compton’s research achievements and all of the other scientific awards and honors received throughout his career.
Barry Lefer
Associate Director of Research, Earth Science Division
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By NASA
Explore This Section Science Uncategorized Helio Highlights: July… Home Framework for Heliophysics Education About Helio Big Idea 1.1 Helio Big Idea 1.2 Helio Big Idea 1.3 Helio Big Idea 2.1 Helio Big Idea 2.2 Helio Big Idea 2.3 Helio Big Idea 3.1 Helio Big Idea 3.2 Helio Big Idea 3.3 Helio Missions Helio Topics Resource Database About NASA HEAT More Highlights Space Math 5 min read
Helio Highlights: July 2025
5 Min Read Helio Highlights: July 2025
When astronauts return to the Moon, they will need to know what the Sun is doing in order to keep themselves safe and healthy. Credits:
NASA A Trip to the Moon
In July 1969, astronauts Neil Armstrong and Buzz Aldrin became the first humans to walk on the Moon. Now, NASA and its international partners in the Artemis accords are working to send humans back there, this time to stay. The trip will be challenging, especially since space is a very uninviting place for humans! One unexpected source of danger will be the Sun.
The Sun: Friend and Foe
The energy the Sun provides allows life on Earth to thrive. But this energy can also be dangerous to us. This danger can be as simple as getting a sunburn if you are out in the sunlight for too long, or as complex as a geomagnetic storm causing chaos in our satellite network.
This animation demonstrates a simulation by the MAGE model of Earth’s magnetosphere being hit by a geospace storm in May 2024, the strongest in nearly 20 years. Storms like this are caused by solar weather that could endanger astronauts en route to the Moon or active on its surface during future missions. NASA’s Scientific Visualization Studio and CGS Team Things get more complicated in space. On Earth, the atmosphere and magnetosphere protect us from most solar energy. But spacecraft and astronauts in space don’t have this protection. For astronauts on upcoming Artemis missions to the Moon, the Sun’s radiation could cause anything from ruined electronics to a greater long-term risk of cancer.
The Real Risks
On August 2, 1972, a massive solar storm began with the eruption of sunspot MR11976. One of the Coronal Mass Ejections (CMEs) it produced raced from the Sun to Earth in less than 15 hours. That’s a record that still stands today! This led to power grid fluctuations and caused havoc with spacecraft in flight. Recently declassified U.S. military records show that the storm caused sea mines off the Vietnamese coast to explode, as well.
Importantly, the August 1972 solar storm happened in between the Apollo 16 and 17 missions to the Moon. Studies show that astronauts en route to the Moon, and especially astronauts on the surface, could have been badly sickened by the radiation that came with it. This threat remains real if a solar storm of similar severity were to occur during future Lunar missions.
Watchful Protectors
Organizations like NASA and NOAA keep an eye on the Sun, to forecast potential sources of danger. If a solar flare or Coronal Mass Ejection (CME) is on the way, scientists should be able to spot the danger ahead of time so that steps can be taken to reduce the damage. For astronauts going to the Moon, this may be as simple as taking shelter in a special part of their spacecraft.
An animated gif of a Coronal Mass Ejection (CME) erupting from the surface of the Sun in September 2024. If a CME like this was aimed at the Moon, the intense energy it carried could damage spacecraft electronics and even cause severe radiation sickness in astronauts. NOAA/NASA NOAA’s Space Weather Follow-On (SWFO) program sustains their space weather observations and measurements. NOAA’s CCOR-1 flew on the GOES-19 spacecraft and provides crucial near-real-time CME data. The CCOR-2 instrument will fly on SWFO-L1. Other missions include SOHO, a long-running collaboration between NASA and the European Space Agency, and HERMES, a NASA heliophysics instrument intended for the Lunar Gateway that will orbit the Moon.
NASA’s Moon to Mars Space Weather Analysis Office (M2M SWAO) also conducts real-time space weather assessments. These support new capabilities for understanding space weather impacts on NASA exploration activities, including on the Moon.
The Moon as a Laboratory
A big part of the reason we want to go back to the Moon is the amazing level of information we can learn about the history of the Solar System. “Any object in our solar system doesn’t just exist in isolation,” explains Prabal Saxena, a Research Space Scientist in the Planetary Geology, Geophysics & Geochemistry Lab at NASA’s Goddard Space Flight Center. “It is constantly interacting with meteorites and meteors. That’s why you see a lot of the impact creators on the Moon. But it is also constantly interacting with the Sun.” This can come from the solar wind, CMEs, and other forms of solar energy hitting the Moon’s barren surface.
Pictured is the Lunar Swirl Reiner Gamma, a geological feature on the surface of the moon. In areas that are magnetically protected, the ground stays relatively bright. Just outside of the shielded regions, radiation-induced chemical reactions darken the landscape, effectively “sunburning” the lunar surface. NASA/GSFC/Arizona State University Saxena points out that the Moon’s relative lack of a magnetosphere means that Lunar surface material effectively traps evidence of the past habits of the Sun. “A lot of the energetic particles that we would otherwise see deflected by Earth’s magnetosphere and atmosphere are impacting the surface of the Moon. So you can actually trace back what the history of the Sun might be.”
He compares this to scientists taking ice cores to get a glimpse into Earth’s atmospheric history. With everything from evidence of the prehistoric solar atmosphere to information on how the Sun affects water on the lunar surface locked in rocks left largely untouched for millions of years, it is clear why NASA wants to go back and have another look around.
Going Back
But it is still important to keep an eye on the potential dangers to explorers both metallic and organic. In an interview, Lennard Fisk, former NASA Associate Administrator for Space Science and Applications, described a conversation he had with Neil Armstrong. More than anything else during Apollo 11, Armstrong was afraid of a solar flare. He knew he could depend on his spacecraft and crewmates. But space weather was an uncontrollable variable.
We had a different understanding of space weather in 1969. Space radiation, including the solar wind, was a new discovery back then. But research done in those early days helped make breakthroughs still paying off today, and we are building upon these discoveries with new missions that continue to advance our knowledge of the Sun and the rest of our solar system.
Additional Resources
Lesson Plans & Educator Guides
NASA Helio Club
Study Unit
Six lessons created for a middle-school audience to introduce basic heliophysics concepts to learners.
Space Weather Math
Hands-on activities with embedded math problems that explore the causes and effects of space weather.
“Solar Storms and You” Educator Guide
A downloadable educator guide with a variety of activities on the science of solar storms for learners grades 5-8.
Interactive Resources
Magnetic Earth
Interactive Resource
An animation with information on Earth’s magnetic field and its role in creating northern lights, and an interactive activity allowing students to experiment with magnetism.
Student HelioViewer:
Solar Data Interactive
A student-friendly interactive with accessible NASA data about the Sun and its features, including solar flares, magnetic fields, sunspots, and Coronal Mass Ejections (CMEs).
Webinars & Slide Decks
What is Space
Weather Video
This approximately 3-minute video summarizes space weather and explains its effects on the rest of the Solar System.
Science Update: Space Weather on Our
Approach to Solar Max
A webinar about the solar storm on May 10th, 2024, which led to auroras being visible across North America.
Astronaut Dr. John
Phillips Discusses
Space Radiation
Dr. John Phillips, NASA astronaut and space plasma physicist, talks about his work and personal experience with space radiation on the Space Weather Living History podcast.
Dr. Lennard Fisk
Discusses Heliophysics History at NASA
Former Associate Administrator Dr. Lennard Fisk recounts the evolution of the Heliophysics Division at NASA.
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By European Space Agency
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