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Night-Shining Cloud Mission Ends; Yields High Science Results for NASA


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Night-Shining Cloud Mission Ends; Yields High Science Results for NASA

The AIM mission above a cloudy Earth.
NASA’s Aeronomy of Ice in the Mesosphere (AIM) mission, seen in this visualization, contributed to NASA’s understanding of the region that borders between Earth’s atmosphere and space.
NASA

After 16 years studying Earth’s highest clouds for the benefit of humanity – polar mesospheric clouds – from its orbit some 350 miles above the ground, NASA’s Aeronomy of Ice in the Mesosphere, or AIM, mission has come to an end.

Initially slated for a two-year mission, AIM was extended numerous times due to its high science return. While AIM has faced hurdles over the years – from software hiccups to hardware issues – an incredibly dedicated team kept the spacecraft running for much longer than anyone could have anticipated. On March 13, 2023, the spacecraft’s battery failed following several years of declining performance. Multiple attempts to maintain power to the spacecraft were made, but no further data could be collected, so the mission has now ended.

“AIM was dedicated to studying the atmospheric region that borders between our atmosphere and space,” said AIM mission scientist Diego Janches, of NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “AIM’s help understanding this region has been of critical importance to providing insights on how the lower atmosphere affects space weather.”

Known as night-shining or noctilucent clouds, they are seen at twilight in the summer months, typically at high latitudes near the North and South Poles. Before the mission, scientists knew these types of clouds varied with latitude, season, and solar activity, but didn’t know why. This mission was launched to understand the variations and study why the clouds form and their links to climate change by measuring the thermal, chemical, and other properties of the environment in which the clouds form.

Clouds above a dark landscape appear in the sky. They are
Noctilucent clouds appeared in the sky above Edmonton, Alberta, in Canada on July 2, 2011.
NASA/Dave Hughes

“NASA’s AIM has been an incredibly successful mission,” said Scott Bailey, AIM principal investigator and professor at Virginia Tech. “It has answered core questions that have helped us understand how noctilucent clouds and atmospheric gravity waves vary over time and location.”

Over the years, AIM made many big discoveries. Data from the mission has thus far led to nearly 400 peer-reviewed publications. This includes findings on how these clouds can be created by meteor smoke and water vapor from rocket exhaust, how events near Earth’s surface can trigger changes in the clouds, and how ice high in the atmosphere can cause mysterious radar echoes, which are created in certain regions of the atmosphere during the summer.

As the mission progressed, scientists realized AIM’s data could also be used to study undulations in the air called atmospheric gravity waves. These waves transfer momentum and energy as they travel through the atmosphere. They link weather events at Earth’s surface with atmospheric disturbances that occur far away from the initial event, including in the uppermost part of the atmosphere where they can disrupt GPS signals.

“We’ve had many difficulties, but we’ve still gotten an incredible amount of data from AIM because of our really excellent, heroic, and hardworking team that comes through every time,” Bailey said.

AIM’s first hurdles started only months after launch in 2007, when the telecommunication receiver started to malfunction intermittently. With a clever use of radio signals, the team was able to reprogram the spacecraft to communicate in Morse code, which allowed it to maintain communications even after the receiver stopped working. While communication with the spacecraft became thousands of times slower than planned, AIM was still able to make its measurements and send home 99% of the data it collected.

Shortly thereafter, the spacecraft again encountered a mission-threatening issue. The spacecraft repeatedly sent itself into safe mode, which effectively shut down the spacecraft and required a time-consuming series of tasks to reboot. But again, the engineers were able to upload new software to the spacecraft to circumvent the issue and keep AIM functional. The new software patch has prevented over a thousand such incidents on the spacecraft since.

In 2019, AIM’s battery started to decline, but through great effort and ingenuity, the mission operations team maintained the battery power, enabling the spacecraft to continue returning data. In early 2023, the battery experienced a significant drop-off in performance which meant the spacecraft could not regularly receive commands or collect data. Unfortunately, this hardware issue was not one that could be repaired remotely, and the satellite finally ceased collecting data in March 2023.

“We’re saddened to see AIM reach the end of its lifetime, but it’s been amazing how long it has lasted,” Bailey said. “It’s given us more data and insight into noctilucent clouds and atmospheric gravity waves than we could ever have hoped for.”

Though the spacecraft has seen its last night-shining clouds, scientists will continue to study AIM’s data for years to come. As for the spacecraft itself, it will slowly lose orbital height and burn up upon atmosphere re-entry in 2026.

“There are still gigabytes upon gigabytes of AIM data to study,” said Cora Randall, AIM deputy principal investigator and senior research scientist at the Laboratory for Atmospheric and Space Physics in Boulder, Colorado. “And as our models and computational capabilities continue to improve, people will make many more discoveries using the AIM datasets.”

For more information about the mission, visit: https://go.nasa.gov/3TgIDwD

By Mara Johnson-Groh
NASA’s Goddard Space Flight Center, Greenbelt, Md.

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      5 Min Read NASA’s Ames Research Center Celebrates 85 Years of Innovation
      The NACA Ames laboratory in 1944 Credits: NASA Ames Research Center in California’s Silicon Valley pre-dates a lot of things. The center existed before NASA – the very space and aeronautics agency it’s a critical part of today. And of all the marvelous advancements in science and technology that have fundamentally changed our lives over the last 85 years since its founding, one aspect has remained steadfast; an enduring commitment to what’s known by some on-center simply as, “an atmosphere of freedom.” 
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      My hope is that you have learned or are learning a love of freedom of thought and are convinced that life is worthwhile only in such an atmosphere
      Joseph sweetman ames
      Founding member of the N.A.C.A.
      “My hope is that you have learned or are learning a love of freedom of thought and are convinced that life is worthwhile only in such an atmosphere,” he said in an address to the graduates of Johns Hopkins University in June 1935.
      That spirit and the people it attracted and retained are a crucial part of how Ames, along with other N.A.C.A. research centers, ultimately made technological breakthroughs that enabled humanity’s first steps on the Moon, the safe return of spacecraft through Earth’s atmosphere, and many other discoveries that benefit our day-to-day lives.
      Russell Robinson momentarily looks to the camera while supervising the first excavation at what would become Ames Research Center.NACA “In the context of my work, an atmosphere of freedom means the freedom to pursue high-risk, high-reward, innovative ideas that may take time to fully develop and — most importantly — the opportunity to put them into practice for the benefit of all,” said Edward Balaban, a researcher at Ames specializing in artificial intelligence, robotics, and advanced mission concepts.
      Balaban’s career at Ames has involved a variety of projects at different stages of development – from early concept to flight-ready – including experimenting with different ways to create super-sized space telescopes in space and using artificial intelligence to help guide the path a rover might take to maximize off-world science results. Like many Ames researchers over the years, Balaban shared that his experience has involved deep collaborations across science and engineering disciplines with colleagues all over the center, as well as commercial and academic partners in Silicon Valley where Ames is nestled and beyond. This is a tradition that runs deep at Ames and has helped lead to entirely new fields of study and seeded many companies and spinoffs.
      Before NASA, Before Silicon Valley: The 1939 Founding of Ames Aeronautical Laboratory “In the fields of aeronautics and space exploration the cost of entry can be quite high. For commercial enterprises and universities pursuing longer term ideas and putting them into practice often means partnering up with an organization such as NASA that has the scale and multi-disciplinary expertise to mature these ideas for real-world applications,” added Balaban.
      “Certainly, the topics of inquiry, the academic freedom, and the benefit to the public good are what has kept me at Ames,” reflected Ross Beyer, a planetary scientist with the SETI Institute at Ames. “There’s not a lot of commercial incentive to study other planets, for example, but maybe there will be soon. In the meantime, only with government funding and agencies like NASA can we develop missions to explore the unknown in order to make important fundamental science discoveries and broadly share them.”
      For Beyer, his boundary-breaking moment came when he searched – and found – software engineers at Ames capable and passionate about open-source software to generate accurate, high-resolution, texture-mapped, 3D terrain models from stereo image pairs. He and other teams of NASA scientists have since applied that software to study and better understand everything from changes in snow and ice characteristics on Earth, as well as features like craters, mountains, and caves on Mars or the Moon. This capability is part of the Artemis campaign, through which NASA will establish a long-term presence at the Moon for scientific exploration with commercial and international partners. The mission is to learn how to live and work away from home, promote the peaceful use of space, and prepare for future human exploration of Mars. 
      “As NASA and private companies send missions to the Moon, they need to plan landing sites and understand the local environment, and our software is freely available for anyone to use,” Beyer said. “Years ago, our management could easily have said ‘No, let’s keep this software to ourselves; it gives us a competitive advantage.’ They didn’t, and I believe that NASA writ large allows you to work on things and share those things and not hold them back.” 
      When looking forward to what the next 85 years might bring, researchers shared a belief that advancements in technology and opportunities to innovate are as expansive as space itself, but like all living things, they need a healthy atmosphere to thrive. Balaban offered, “This freedom to innovate is precious and cannot be taken for granted. It can easily fall victim if left unprotected. It is absolutely critical to retain it going forward, to ensure our nation’s continuing vitality and the strength of the other freedoms we enjoy.”
      Ames Aeronautical Laboratory.NACAView the full article
    • By NASA
      A method for evaluating thermophysical properties of metal alloys

      Simulation of the solidification of metal alloys, a key step in certain industrial processes, requires reliable data on their thermophysical properties such as surface tension and viscosity. Researchers propose comparing predictive models with experimental outcomes as a method to assess these data.

      Scientists use data on surface tension and viscosity of titanium-based alloys in industrial processes such as casting and crystal growth. Non-Equilibrium Solidification, Modelling for Microstructure Engineering of Industrial Alloys, an ESA (European Space Agency) investigation, examined the microstructure and growth of these alloys using the station’s Electromagnetic Levitator. This facility eliminates the need for containers, which can interfere with experiment results.
      European Space Agency (ESA) astronaut Alexander Gerst is shown in the Columbus module of the International Space Station during the installation of the Electromagnetic Levitator.ESA/Alexander Gerst Overview of techniques for measuring thermal diffusion

      Researchers present techniques for measuring thermal diffusion of molecules in a mixture. Thermal diffusion is measured using the Soret coefficient – the ratio of movement caused by temperature differences to overall movement within the system. This has applications in mineralogy and geophysics such as predicting the location of natural resources beneath Earth’s surface.

      A series of ESA investigations studied diffusion, or how heat and particles move through liquids, in microgravity. Selectable Optical Diagnostics Instrument-Influence of VIbrations on DIffusion of Liquids examined how vibrations affect diffusion in mixtures with two components and SODI-DCMIX measured more-complex diffusion in mixtures of three or more components. Understanding and predicting the effects of thermal diffusion has applications in various industries such as modeling of underground oil reservoirs.
      NASA astronaut Kate Rubins works on Selectable Optical Diagnostics Instrument Experiment Diffusion Coefficient Mixture-3 (SODI) DCMix-3 installation inside the station’s Microgravity Science Glovebox.JAXA (Japan Aerospace Exploration Agency)/Takuya Onishi Research validates ferrofluid technology

      Researchers validated the concept of using ferrofluid technology to operate a thermal control switch in a spacecraft. This outcome could support development of more reliable and long-lasting spacecraft thermal management systems, increasing mission lifespan and improving crew safety.

      Überflieger 2: Ferrofluid Application Research Goes Orbital analyzed the performance of ferrofluids, a technology that manipulates components such as rotors and switches using magnetized liquids and a magnetic field rather than mechanical systems, which are prone to wear and tear. This technology could lower the cost of materials for thermal management systems, reduce the need for maintenance and repair, and help avoid equipment failure. The paper discusses possible improvements to the thermal switch, including optimizing the geometry to better manage heat flow.
      A view of the Ferrofluid Application Research Goes Orbital investigation hardware aboard the International Space Station. UAE (United Arab Emirates)/Sultan AlneyadiView the full article
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