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Journey back to Earth: Aeolus' historic reentry
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By NASA
A SpaceX Falcon 9 rocket lifts off from Vandenberg Space Force Base, carrying NASA’s EZIE spacecraft into orbit. SpaceX Under the nighttime California sky, NASA’s EZIE (Electrojet Zeeman Imaging Explorer) mission launched aboard a SpaceX Falcon 9 rocket at 11:43 p.m. PDT on March 14.
Taking off from Vandenberg Space Force Base near Santa Barbara, the EZIE mission’s trio of small satellites will fly in a pearls-on-a-string configuration approximately 260 to 370 miles above Earth’s surface to map the auroral electrojets, powerful electric currents that flow through our upper atmosphere in the polar regions where auroras glow in the sky.
At approximately 2 a.m. PDT on March 15, the EZIE satellites were successfully deployed. Within the next 10 days, the spacecraft will send signals to verify they are in good health and ready to embark on their 18-month mission.
“NASA has leaned into small missions that can provide compelling science while accepting more risk. EZIE represents excellent science being executed by an excellent team, and it is delivering exactly what NASA is looking for,” said Jared Leisner, program executive for EZIE at NASA Headquarters in Washington.
The electrojets — and their visible counterparts, theauroras — are generated duringsolar storms when tremendous amounts of energy get transferred into Earth’s upper atmosphere from the solar wind. Each of the EZIE spacecraft will map the electrojets, advancing our understanding of the physics of how Earth interacts with its surrounding space. This understanding will apply not only to our own planet but also to any magnetized planet in our solar system and beyond. The mission will also help scientists create models for predicting space weather to mitigate its disruptive impacts on our society.
“It is truly incredible to see our spacecraft flying and making critical measurements, marking the start of an exciting new chapter for the EZIE mission,” said Nelli Mosavi-Hoyer, project manager for EZIE at the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland. “I am very proud of the dedication and hard work of our team. This achievement is a testament to the team’s perseverance and expertise, and I look forward to the valuable insights EZIE will bring to our understanding of Earth’s electrojets and space weather.”
Instead of using propulsion to control their polar orbit, the spacecraft will actively use drag experienced while flying through the upper atmosphere to individually tune their spacing. Each successive spacecraft will fly over the same region 2 to 10 minutes after the former.
“Missions have studied these currents before, but typically either at the very large or very small scales,” said Larry Kepko, EZIE mission scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “EZIE will help us understand how these currents form and evolve, at scales we’ve never probed.”
The mission team is also working to distribute magnetometer kits called EZIE-Mag, which are available to teachers, students, and science enthusiasts who want to take their own measurements of the Earth-space electrical current system. EZIE-Mag data will be combined with EZIE measurements made from space to assemble a clear picture of this vast electrical current circuit.
The EZIE mission is funded by the Heliophysics Division within NASA’s Science Mission Directorate and is managed by the Explorers Program Office at NASA Goddard. The Johns Hopkins Applied Physics Laboratory leads the mission for NASA. Blue Canyon Technologies in Boulder, Colorado, built the CubeSats, and NASA’s Jet Propulsion Laboratory in Southern California built the Microwave Electrojet Magnetogram, which will map the electrojets, for each of the three satellites.
For the latest mission updates, follow NASA’s EZIE blog.
By Brett Molina
Johns Hopkins Applied Physics Laboratory
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Last Updated Mar 15, 2025 Editor Vanessa Thomas Contact Sarah Frazier sarah.frazier@nasa.gov Location Goddard Space Flight Center Related Terms
Heliophysics Auroras CubeSats EZIE (Electrojet Zeeman Imaging Explorer) Goddard Space Flight Center Heliophysics Division Missions Small Satellite Missions The Sun Explore More
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By NASA
Curiosity Navigation Curiosity Home Mission Overview Where is Curiosity? Mission Updates Science Overview Instruments Highlights Exploration Goals News and Features Multimedia Curiosity Raw Images Images Videos Audio Mosaics More Resources Mars Missions Mars Sample Return Mars Perseverance Rover Mars Curiosity Rover MAVEN Mars Reconnaissance Orbiter Mars Odyssey More Mars Missions Mars Home 2 min read
Sols 4477-4478: Bumping Back to Business
NASA’s Mars rover Curiosity acquired this image using its Right Navigation Camera on March 10, 2025 — sol 4476, or Martian day 4,476 of the Mars Science Laboratory mission — at 04:15:44 UTC. NASA/JPL-Caltech Written by Sharon Wilson Purdy, Planetary Geologist at the Smithsonian National Air and Space Museum
Earth planning date: Monday, March 10, 2025
The Curiosity rover is winding between the spectacular Gould mesa and Texoli butte through beautifully layered terrain. The end-of-drive target from last week’s plan was a rock with a knobby/bumpy texture that appears quite different from the typical surrounding bedrock. While this interesting rock was in our workspace today, we ended up being just a touch too close to do contact science. As a result, the science team decided to “bump back” (e.g., drive backwards) to get the rover in an ideal position to analyze and characterize this rock on Wednesday.
In the middle of the rover’s workspace today there was a large patch of soil and sand that MAHLI and APXS teamed up to analyze at a target named “Angeles Crest.” Nearby, Mastcam imaged troughs (depressions) along the axis of the sand ridge to understand how they formed. Mastcam had several other targets in the plan that imaged the workspace and surroundings including “Potrero John,” the knobby rock in the workspace, a rock with similar nodular textures in the distance named “Modjeska Peak,” and a light tan rock with a dome-like structure in the vicinity of “Humber Park.”
ChemCam selected a slab of bedrock and loose (“float”) rock in the workspace to characterize their geochemistry with the LIBS instrument at “Millard Canyon” and “Cajon Pass,” respectively. Off in the distance, the science team selected the face of Gould mesa and upper Texoli butte for ChemCam long distance RMI imaging to get a closer look at the rocks, fractures, and layering.
The environmental theme group scheduled several activities to look at clouds, document the atmospheric opacity, and measure the optical depth of the atmosphere and constrain aerosol scattering properties. We have lots of exciting data in hand and more on the road ahead!
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Last Updated Mar 12, 2025 Related Terms
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Preparations for Next Moonwalk Simulations Underway (and Underwater)
NASA astronaut Douglas Hurley is helped out of the SpaceX Crew Dragon Endeavour spacecraft onboard the SpaceX GO Navigator recovery ship after he and NASA astronaut Robert Behnken landed in the Gulf of Mexico off the coast of Pensacola, Florida, Sunday, Aug. 2, 2020. The Demo-2 test flight for NASA’s Commercial Crew Program was the first to deliver astronauts to the International Space Station and return them safely to Earth onboard a commercially built and operated spacecraft. Behnken and Hurley returned after spending 64 days in space. Photo Credit: (NASA/Bill Ingalls)NASA New spacecraft that will transport crews to the Lunar and Martian surfaces and return them to Earth may have diverse landing modalities which will function in different landing environments. Additionally, the crew may be deconditioned on landing, impacting their ability to independently egress the vehicles, perform post-landing tasks in a timely manner, and perform surface EVAs post-landing -including those required for emergencies.
Boeing and NASA teams work around Boeing’s CST-100 Starliner spacecraft after it landed at White Sands Missile Range’s Space Harbor, Wednesday, May 25, 2022, in New Mexico. Boeing’s Orbital Flight Test-2 (OFT-2) is Starliner’s second uncrewed flight test to the International Space Station as part of NASA’s Commercial Crew Program. OFT-2 serves as an end-to-end test of the system’s capabilities. Photo Credit: (NASA/Bill Ingalls) Directed Acyclic Graph Files
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By NASA
Explore This Section Earth Home Earth Observer Home Editor’s Corner Feature Articles Meeting Summaries News Science in the News Calendars In Memoriam More Archives 13 min read
The NASA DC-8 Retires: Reflections on its Contributions to Earth System Science
Introduction
Since 1987, a highly modified McDonnell Douglas DC-8 aircraft has been a workhorse in NASA’s Airborne Science Program (ASP)—see Photo 1. The aircraft, located at NASA’s Armstrong Flight Research Center (AFRC) in California, flew countless missions as a science laboratory, producing science data that supports projects serving the world’s scientific community, particularly the NASA Earth science community. NASA recently decided to retire the venerable DC-8 aircraft, which made its last science flight in April 2024. The DC-8 is being replaced with a similarly refurbished Boeing 777 aircraft, which will be even more capable than the DC-8.
Photo 1. NASA’s DC-8 flying laboratory flew Earth science missions for NASA’s. Airborne Science Program (ASP) from 1987–2024. The versatile aircraft was used to conduct a variety of research experiments that spanned all seven continents. Photo credit: Lori Losey [NASA’s Armstrong Flight Research Center (AFRC)] More information is available about the full history of ASP, its primary objectives, and its many achievements in an archived article: see “Flying in the ‘Gap’ Between Earth and Space: NASA’s Airborne Science Program” [The Earth Observer, September–October 2020, 32:5, 4–14].
Workshop Overview
The NASA History Office and NASA Earth Science Division cohosted a workshop, titled “Contributions of the DC-8 to Earth System Science at NASA,” on October 24–25, 2024 at the Mary W. Jackson NASA Headquarters (HQ) Building in Washington, DC – see Photo 2.
The agenda included not just the DC-8’s contributions to Earth Science at NASA, but also its role supporting the Aeronautics Research Mission Directorate and work in space science. Many DC-8 veterans – including several who are now retired – attended the event in person or online. The program consisted of six panels and roundtables, each calling attention to a unique aspect of the DC-8 story.
Photo 2. Group photo of the in person and remote participants of the workshop on “Contributions of the DC-8 to Earth System Science at NASA,” which took place October 24–25, 2024 at the Mary W. Jackson NASA Headquarters (HQ) Building in Washington, DC. Photo credit: Rafael Luis Méndez Peña [NASA’s Ames Research Center, Earth Science Program Office] The event featured 38 individuals (speakers, panelists, and moderators) from NASA HQ, five NASA centers, eight universities, the Search for Extraterrestrial Intelligence Institute, and the National Oceanic and Atmospheric Administration. In addition, Spanish filmmaker Rafael Luis Méndez Peña debuted a trailer for his documentary film, NASA-817, on October 24 and took photographs during the workshop. The ??? agenda a workshop recording ???, and other related materials are available through the NASA History Office.
The Tale of the NASA DC-8
The article follows the outline of the workshop that places the DC-8 in the context of the overall history of NASA aircraft observations, science campaigns, community, and international collaboration, education and outreach activities.
A History in Context: the DC-8 and NASA’s Airborne Science Program
NASA’s involvement in airborne science extends to the agency’s inception. The National Aeronautics and Space Act of 1958 states that NASA’s first objective shall be “the expansion of human knowledge of phenomena in the atmosphere and space.” Subsequent legislation expanded NASA’s role in atmospheric and Earth system science. To fulfill this objective, NASA maintains a fleet of airborne platforms through ASP – see Figure –to study the environment, develop new technologies, verify satellite data, and monitor space vehicle activity.
Figure. The DC-8 was but one aircraft is NASA’s sizeable Airborne Science Fleet – which is maintained and operated by ASP. Note that in addition to a variety of piloted aircraft operating at different altitudes shown in this drawing, NASA also operates uncrewed aircraft systems and even uses kites to conduct Earth observations. Figure credit: NASA Science Suborbital Platforms, NASA’s Goddard Space Flight Center, Science Support Office NASA operated two large flying laboratories prior to the DC-8 Airborne Science Laboratory. Both aircraft were converted Convair (CV) 990s. Regrettably, both aircraft succumbed to catastrophic accidents. The first, known as Galileo, collided with a U.S. Navy P-3 Orion near Moffett Field, CA, in April 1973, killing 11 NASA personnel. Its replacement, Galileo II, crashed on takeoff at March Air Force Base in July 1985. While there were no fatalities in the second accident, the ensuing fire consumed the aircraft and its instruments. The loss of Galileo II left a gaping hole in NASA’s ability to conduct essential scientific and engineering research.
In January 1986, after months of bureaucratic scrambling, NASA finalized the purchase of former commercial airliner (DC-8-72) for $24 million, which included costs to modify the aircraft to carry a science payload and crew. The modified DC-8 Airborne Science Laboratory—shown in Photo 2— arrived at NASA Ames Research Center during the Summer of 1987.
Overview Presentations on Airborne Science
Jack Kaye [NASA Headquarters—Associate Director for Research of the Earth Science Division] gave the meeting’s opening remarks, where he placed the DC-8’s activities in a larger perspective. He noted that one of the features that makes airborne science so unique at NASA is the combination of platforms, sensors, systems, people, and opportunities. The DC-8 was able to carry a large number of people as well as instruments to carry out long-range operations under diverse conditions.
“[The DC-8 offered] a really versatile, flexible platform that’s allowed for lots of science,” said Kaye.
Later in the meeting, Karen St. Germain [NASA Headquarters—Director of the Earth Science Division] built upon Kaye’s comments. She noted that while NASA’s satellite missions receive most of the public’s attention, airborne science is an essential part of the NASA mission.
“This is the grassroots of science,” she stressed. “It’s where a lot of the great ideas are born. It’s where a lot of the fledgling sensor technologies are demonstrated.”
First Flight for the DC-8
NASA routinely conducts field campaigns – where ground observations are timed and coordinated with aircraft flights (often at more than one altitude) and with satellite overpasses to gain a comprehensive (multilayered, multiscale) picture of the atmosphere over a certain area. A more detailed account of two NASA field campaigns from the 1980s and 1990s, and their follow-up missions, is available in an archived article: see “Reflections on FIFE and BOREAS: Historical Perspective and Meeting Summary” [The Earth Observer, January–February 2017, 29:1, 6–23]. The article illustrates scaled observations as they were conducted during FIFE and BOREAS.
Researchers first used the DC-8 Airborne Science Laboratory on a high-profile interagency field campaign – Antarctic Airborne Ozone Expedition (AAOE), the first airborne experiment to study the chemistry and dynamics of the Antarctic ozone hole. The scientific data collected during AAOE produced unequivocable evidence that human-made chemicals were involved in the destruction of ozone over the Antarctic. This data served as a major impetus toward the enactment of amendments to the Montreal Protocol, which banned the manufacture of chlorofluorocarbons.
Estelle Condon [NASA’s Ames Research Center (ARC), emeritus] was a program manager for AAOE. During the meeting, she shared her memories of the hectic days leading up to the DC-8’s first mission.
“There was an enormous task in front of [the aircraft team] – just a huge task – to get all the relay racks, all the wiring, all the ports for the windows designed and built so that when the scientists finally came, all that instrumentation could actually be put on the aircraft,” said Condon. She added that the ARC staff worked day and night and every weekend to make the plane ready.
“It’s a miracle that they were able to put everything together and get it to the tip of South America in time for the mission,” she said.
Other Noteworthy Field Campaigns Involving the DC-8
The DC-8 would go on to be used in many other field campaigns throughout its 37-year history
and was central to several of NASA’s research disciplines. For example, Michael Kurylo [NASA Headquarters—Atmospheric Composition Program Scientist] was the manager of NASA’s Upper Atmosphere Research Program, where he developed, promoted, and implemented an extramural research program in stratospheric and upper tropospheric composition and directed its advanced planning at a national and international level. Kurylo summarized the DC-8’s many flights to study stratospheric chemistry beyond the AAOE missions.
Kurylo also discussed the DC-8’s role in tropospheric chemistry investigations, especially through the many field campaigns that were conducted as part of the Global Troposphere Experiment (GTE). He also touched on the culture of NASA airborne science and the dynamic that existed between scientists and those who operated and maintained the aircraft. “The scientists were always referred to [by NASA pilots and groundcrew] as ‘coneheads’…. Too much college, not enough high school,” Kurylo explained. But he and his colleagues have such fond memories of their time spent working together onboard the DC-8.
James Crawford [NASA’s Langley Research Center], a project scientist for many of the GTE campaigns, explained that from 1983–2001 16 GTE aircraft-based missions, each with its own name and location, took place. Each mission collected a rich set of data records of atmospheric observations and on many occasions the data were used as baselines for subsequent campaigns. The DC-8 was one of several NASA aircraft involved, the others being the Corvair-990, Electra, and P-3B.
Joshua Schwarz [NOAA’s Chemical Sciencc Laboratory] discussed the airplane’s role in global atmospheric monitoring. He recall thinking, after his first experience with the DC-8 that this flying airborne laboratory, “…was going to make things possible that wouldn’t otherwise be possible,” Schwarz concluded after his first encounter with the DC-8.
Other workshop participants went on to describe how – for nearly four decades – investigators used data collected by instruments on the DC-8 to conduct research and write papers on important scientific and engineering topics.
The People Behind the Aircraft: The DC-8 Community
The DC-8 was a large and durable aircraft capable of long-range flights, which made it ideal for conducting scientific research. Around these research efforts a strong community emerged. Over three decades, the DC-8 accommodated many investigators from NASA, interagency offices, U.S. universities, and international organizations on extended global missions. Agency officials also moved the DC-8 base of operations several times between 1986 and 2024, thereby demanding tremendous cross-center cooperation.
“Looking around the room, it’s clear that what brought us together [for the workshop] is more than just an aircraft,” said Nickelle Reid [NASA’s Armstrong Flight Research Center]. “It’s been a shared commitment, decades of passion and dedication from scientists, yes, but also mechanics, technicians, integration engineers, project managers, mission planners, operations engineers, flight engineers, mission directors, mission managers, logistics technicians and, of course, pilots. This village of people has been the beating heart of the DC-8 program.”
This DC-8 community was well represented at this workshop and played a key role in its success.
The DC-8 as a Means of International Engagement
The DC-8 community expanded beyond the U.S., opening unique opportunities for international engagement. The campaigns of the DC-8 Airborne Science Laboratory routinely involved foreign students, institutions, and governments. For example, the Korea–U.S. Air Quality (KORUS-AQ) campaign, an international cooperative air quality field study in Korea, took place in 2016. For more information about this campaign, see the archived Earth Observer article, “Flying in the ‘Gap’ Between Earth and Space: NASA’s Airborne Science Program” [The Earth Observer, September–October 2022, 32:5, 4–14].
Yunling Lou [NASA/Jet Propulsion Laboratory] spoke to the workshop audience about the value of international collaboration.
“I think [international collaboration] really helped – not just doing the collaboration [to accomplish a specific mission] but doing the training, the capacity building in these countries to build the community of global scientists and engineers,” said Lou.
Trina Dryal [LaRC—Deputy Director] continued that the DC-8 and NASA’s other airborne assets are more than just science laboratories.
“[They] are opportunities for science, diplomacy, international collaboration, cross learning, educational inspiration, and goodwill,” said Dryal—see Photo 3.
Photo 3. International collaborations included educational endeavors. Here, Walter Klein [AFRC—DC-8 Mission Manager] poses with a group of Chilean students onboard the DC-8 Airborne Science Laboratory in Punta Arenas, Chile, March 2004. Photo credit: Jim Closs [NASA’s Langley Research Center] Student Investigations on the DC-8
Closer to home, the flying scientific laboratory affected the lives of many U.S. students and early career professionals. NASA’s Student Airborne Research Program (SARP), is an eight-week summer internship for rising-senior undergraduates that takes place annually on the East and West coasts of the U.S – see Photo 4. During the program, students gain hands-on experience conducting all aspects of a scientific campaign. They conduct field research, analyze the data, and gain access to one or more of NASA’s ASP flying science laboratories. Since 2009, this program alone has provided hands on experience in conducting NASA Earth science research to XXXX students.
Berry Lefer [NASA Headquarters—Tropospheric Composition Program Manager] pointed out that SARP helped to integrate American students into DC-8 scientific missions.
“I want to make sure the NASA historians understand that the DC-8 is the premier flying laboratory on the planet, bar none,” said Lefer. “You’ve seen over the whole three-decade life of the DC-8 that education and outreach, student involvement has been a hallmark of the DC-8 [program].”
Yaitza Luna-Cruz [NASA Headquarters—Program Executive] was one among several SARP alumni who delivered testimony on the impact of the SARP program at the workshop.
“SARP unleashed my potential in ways that I cannot even describe,” said Luna-Cruz. “You never know what a single opportunity could do to shape the career of a student or early career researcher.
Luna-Cruz hopes these efforts continue with the coming of NASA’s new Boeing 777 airborne laboratory.
Photo 4. One of the most popular student investigations flown on the DC-8 (and other ASP aircraft) was (is) the Student Airborne Research Program (SARP), in which upper-level undergraduate students can gain valuable hands-on experience conducting field research. Students taking part in SARP and their mentors posed with the DC-8 at AFRC in 2019 [top] and in 2022 [bottom]. The 2022 SARP group flew flights over California’s Central Valley to study air quality. Photo credit: [Top] NASA; [bottom] Lauren Hughes [ARC] Final Flight and Retirement of the DC-8
The DC-8 Airborne Science Laboratory flew its last science flight during the international Airborne and Satellite Investigation of Asian Air Quality mission (ASIA-AQ) in April 2024. Since its final flight, the aircraft has been retired to Idaho State University (ISU). Today, students in ISU’s aircraft maintenance program work on the airplane to develop real-world technical skills – continuing the DC-8’s mission as an educational platform. According to Gerald Anhorn [ISU—Dean of College of Technology], ISU students have a unique opportuning to gain experience working on a legendary research aircraft.
“Our students have that opportunity because of [NASA’s] donation” to the school, said Auborn.
Conclusion: Flying Toward the Future – From DC-8 to Boeing 777
While the DC-8 is retiring from active service, airborne observations continue to be a vital part of NASA’s mission. The agency recently acquired a Boeing 777and will modify it to support its ongoing airborne scientific research efforts. This new addition expands beyond the capacity of the DC-8 by allowing for even longer flights with larger payloads and more researchers to gather data. Several members of the Boeing 777 team from NASA’s Langley Research Center (LaRC) attended the workshop.
“I mentioned I was in charge of the ‘replacement’ for the DC-8,” said Martin Nowicki [LaRC—Boeing 777 Lead]. “Over the last two days, here, it’s become pretty apparent that there’s no ‘replacing’ the DC-8. It’s carved out its own place in history. It’s just done so much.”
Nowicki looks forward to working with workshop participants to identify useful lessons of the past for future operators. He concluded that the Boeing 777 will carry the legacy of the DC-8 and continue with capturing the amazing science of ASP.
Acknowledgments
The authors wish to thank Jack Kaye [NASA HQ—Associate Director of Research for the Earth Science Division] for his helpful reviews of the article draft. The first author also wishes to thank Lisa Frazier [NASA Headquarters—Strategic Events and Engagement Lead] for providing support and assistance throughout for the in-person workshop participants. and to the Earth Science Project Office team from NASA’s Ames Research Center, who performed essential conference tasks, such as website construction, audio-visual support, and food service management. This article is an enhanced version of the first author’s summary, which appeared in the Spring 2025 issue of News & Notes – The NASA History Office’s newsletter.
Bradley L. Coleman
NASA’s Marshall Space Flight Center, NASA History Office
bradley.l.coleman@nasa.gov
Alan B. Ward
NASA’s Goddard Space Flight Center/Global Science & Technology Inc.
alan.b.ward@nasa.gov
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Last Updated Mar 11, 2025 Related Terms
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