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By NASA
6 Min Read NASA’s PUNCH Mission to Revolutionize Our View of Solar Wind
Earth is immersed in material streaming from the Sun. This stream, called the solar wind, is washing over our planet, causing breathtaking auroras, impacting satellites and astronauts in space, and even affecting ground-based infrastructure.
NASA’s PUNCH (Polarimeter to Unify the Corona and Heliosphere) mission will be the first to image the Sun’s corona, or outer atmosphere, and solar wind together to better understand the Sun, solar wind, and Earth as a single connected system.
Launching no earlier than Feb. 28, 2025, aboard a SpaceX Falcon 9 rocket from Vandenberg Space Force Base in California, PUNCH will provide scientists with new information about how potentially disruptive solar events form and evolve. This could lead to more accurate predictions about the arrival of space weather events at Earth and impact on humanity’s robotic explorers in space.
“What we hope PUNCH will bring to humanity is the ability to really see, for the first time, where we live inside the solar wind itself,” said Craig DeForest, principal investigator for PUNCH at Southwest Research Institute’s Solar System Science and Exploration Division in Boulder, Colorado.
This video can be freely shared and downloaded at https://svs.gsfc.nasa.gov/14773.
Video credit: NASA’s Goddard Space Flight Center Seeing Solar Wind in 3D
The PUNCH mission’s four suitcase-sized satellites have overlapping fields of view that combine to cover a larger swath of sky than any previous mission focused on the corona and solar wind. The satellites will spread out in low Earth orbit to construct a global view of the solar corona and its transition to the solar wind. They will also track solar storms like coronal mass ejections (CMEs). Their Sun-synchronous orbit will enable them to see the Sun 24/7, with their view only occasionally blocked by Earth.
Typical camera images are two dimensional, compressing the 3D subject into a flat plane and losing information. But PUNCH takes advantage of a property of light called polarization to reconstruct its images in 3D. As the Sun’s light bounces off material in the corona and solar wind, it becomes polarized — meaning the light waves oscillate in a particular way that can be filtered, much like how polarized sunglasses filter out glare off of water or metal. Each PUNCH spacecraft is equipped with a polarimeter that uses three distinct polarizing filters to capture information about the direction that material is moving that would be lost in typical images.
“This new perspective will allow scientists to discern the exact trajectory and speed of coronal mass ejections as they move through the inner solar system,” said DeForest. “This improves on current instruments in two ways: with three-dimensional imaging that lets us locate and track CMEs which are coming directly toward us; and with a broad field of view, which lets us track those CMEs all the way from the Sun to Earth.”
All four spacecraft are synchronized to serve as a single “virtual instrument” that spans the whole PUNCH constellation.
Crews conduct additional solar array deployment testing for NASA’s PUNCH (Polarimeter to Unify the Corona and Heliosphere) satellites at Astrotech Space Operations located on Vandenberg Space Force Base in California on Wednesday, Jan. 22, 2025. USSF 30th Space Wing/Alex Valdez The PUNCH satellites include one Narrow Field Imager and three Wide Field Imagers. The Narrow Field Imager (NFI) is a coronagraph, which blocks out the bright light from the Sun to better see details in the Sun’s corona, recreating what viewers on Earth see during a total solar eclipse when the Moon blocks the face of the Sun — a narrower view that sees the solar wind closer to the Sun. The Wide Field Imagers (WFI) are heliospheric imagers that view the very faint, outermost portion of the solar corona and the solar wind itself — giving a wide view of the solar wind as it spreads out into the solar system.
“I’m most excited to see the ‘inbetweeny’ activity in the solar wind,” said Nicholeen Viall, PUNCH mission scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “This means not just the biggest structures, like CMEs, or the smallest interactions, but all the different types of solar wind structures that fill that in between area.”
When these solar wind structures from the Sun reach Earth’s magnetic field, they can drive dynamics that affect Earth’s radiation belts. To launch spacecraft through these belts, including ones that will carry astronauts to the Moon and beyond, scientists need to understand the solar wind structure and changes in this region.
Building Off Other Missions
“The PUNCH mission is built on the shoulders of giants,” said Madhulika Guhathakurta, PUNCH program scientist at NASA Headquarters in Washington. “For decades, heliophysics missions have provided us with glimpses of the Sun’s corona and the solar wind, each offering critical yet partial views of our dynamic star’s influence on the solar system.”
When scientists combine data from PUNCH and NASA’s Parker Solar Probe, which flies through the Sun’s corona, they will see both the big picture and the up-close details. Working together, Parker Solar Probe and PUNCH span a field of view from a little more than half a mile (1 kilometer) to over 160 million miles (about 260 million kilometers).
Additionally, the PUNCH team will combine their data with diverse observations from other missions, like NASA’s CODEX (Coronal Diagnostic Experiment) technology demonstration, which views the corona even closer to the surface of the Sun from its vantage point on the International Space Station. PUNCH’s data also complements observations from NASA’s EZIE (Electrojet Zeeman Imaging Explorer) — targeted for launch in March 2025 — which investigates the magnetic field perturbations associated with Earth’s high-altitude auroras that PUNCH will also spot in its wide-field view.
A conceptual animation showing the heliosphere, the vast bubble that is generated by the Sun’s magnetic field and envelops all the planets.
NASA’s Goddard Space Flight Center Conceptual Image Lab As the solar wind that PUNCH will observe travels away from the Sun and Earth, it will then be studied by the IMAP (Interstellar Mapping and Acceleration Probe) mission, which is targeting a launch in 2025.
“The PUNCH mission will bridge these perspectives, providing an unprecedented continuous view that connects the birthplace of the solar wind in the corona to its evolution across interplanetary space,” said Guhathakurta.
The PUNCH mission is scheduled to conduct science for at least two years, following a 90-day commissioning period after launch. The mission is launching as a rideshare with the agency’s next astrophysics observatory, SPHEREx (Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer).
“PUNCH is the latest heliophysics addition to the NASA fleet that delivers groundbreaking science every second of every day,” said Joe Westlake, heliophysics division director at NASA Headquarters in Washington. “Launching this mission as a rideshare bolsters its value to the nation by optimizing every pound of launch capacity to maximize the scientific return for the cost of a single launch.”
The PUNCH mission is led by Southwest Research Institute’s offices in San Antonio, Texas, and Boulder, Colorado. The mission is managed by the Explorers Program Office at NASA Goddard for NASA’s Science Mission Directorate in Washington.
By Abbey Interrante
NASA’s Goddard Space Flight Center, Greenbelt, Md.
Header Image:
An artist’s concept showing the four PUNCH satellites orbiting Earth.
Credits: NASA’s Goddard Space Flight Center Conceptual Image Lab
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Last Updated Feb 21, 2025 Related Terms
Heliophysics Coronal Mass Ejections Goddard Space Flight Center Heliophysics Division Polarimeter to Unify the Corona and Heliosphere (PUNCH) Science Mission Directorate Solar Wind Space Weather The Sun Explore More
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Sols 4458-4460: Winter Schminter
NASA’s Mars rover Curiosity captured this image of the Texoli butte, a Martian landmark about 525 feet (160 meters) tall, with many layers that scientists are studying to learn more about the formation of this region of the Red Planet. The butte is on the 3-mile-high Mount Sharp, inside Gale Crater, where Curiosity landed and has been exploring since 2012. The rover acquired this image using its Left Navigation Camera on sol 4456, or Martian day 4,456 of the Mars Science Laboratory mission, on Feb. 17, 2025, at 17:51:56 UTC. NASA/JPL-Caltech Earth planning date: Tuesday, Feb. 18, 2025
During today’s unusual-for-MSL Tuesday planning day (because of the U.S. holiday on Monday), we planned activities under new winter heating constraints. Operating Curiosity on Mars requires attention to a number of factors — power, data volume, terrain roughness, temperature — that affect rover operability and safety. Winter means more heating to warm up the gears and mechanisms within the rover and the instruments, but energy that goes to heating means less energy for science observations. Nevertheless, we (and Curiosity) were up to the task of balancing heating and science, and planned enough observations to warm the science team’s hearts.
We fit in DRT, APXS, and MAHLI on two different bedrock targets, “Chumash Trail” and “Wheeler Gorge,” which have different fracturing and layering features. In the workspace, ChemCam targeted a clean vertical exposure of layered bedrock at “Sierra Madre” and a lumpy-looking patch of resistant nodules at “Chiquito Basin.”
The topography of the local terrain and our end-of-drive position after the weekend fortuitously lined up to give us a view of an exposure of the Marker Band, which we first explored on the other side of Gediz Vallis Ridge. Having a view of another exposure of this distinctive horizon helps give us further insight into its origin, so we included both RMI and Mastcam mosaics of the exposure.
Documenting a feature that, unlike the Marker Band, has been and will be in our sights for a long time — “Texoli” butte (pictured above) — was the goal of additional Mastcam and ChemCam imaging. Observations of potential sedimentary structures on the flank of Texoli motivated acquisition of an RMI mosaic, and a chance to capture structures along its southeast face inspired a Mastcam mosaic. Good exposures of additional nearby bedrock structures at “Mount Lukens” and “Chantry Flat” drew the eye of Mastcam, while another small mosaic focused on the kind of linear troughs in the sand we often see bordering bedrock slabs. Environmental observations included Navcam cloud and dust-devil movies, Mastcam observations of dust in the atmosphere, and REMS and RAD measurements spread across the three sols of the plan.
Written by Michelle Minitti, Planetary Geologist at Framework
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Last Updated Feb 20, 2025 Related Terms
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Image credit: NASA/JPL-Caltech
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Sols 4454-4457: Getting Ready to Fill the Long Weekend with Science
NASA’s Mars rover Curiosity acquired this image, which includes the pyramid-shaped rock at left in the photo, the science target dubbed “Pyramid Lake,” using its Left Navigation Camera. The rover acquired the image on sol 4452, or Martian day 4,452 of the Mars Science Laboratory mission, on Feb. 13, 2025, at 14:22:06 UTC. NASA/JPL-Caltech Earth planning date: Friday, Feb. 14, 2025
Curiosity is continuing to make progress along the strategic route, traversing laterally across the sulfate (salt) bearing unit toward the boxwork structures. The team celebrated the completion of another successful drive when we received the downlink this morning, and then we immediately got to work thinking about what’s next. There is a holiday in the United States on Monday, so instead of the typical three-sol weekend plan, we actually planned four sols, which will set us up to return to planning next Tuesday.
The first sol of the plan focuses on remote sensing, and we’ll be taking several small Mastcam mosaics of features around the rover. One of my favorite targets the team picked is a delightfully pointy rock visible toward the left of the Navcam image shown above. The color images we’ll take with Mastcam will give us more information about the textures of this rock and potentially provide insight into the geologic forces that transformed it into this comical shape. The team chose what I think is a very appropriate name for this Martian pyramid-shaped target — “Pyramid Lake.” The terrestrial inspiration behind this name is a human-made reservoir (lake) near Los Angeles with a big (also human-made) pyramidal hill in it.
On the second sol of the plan, we’ll use the instruments on Curiosity’s arm to collect data of rock targets at our feet, including “Strawberry Peak,” a bumpy piece of bedrock, “Lake Arrowhead,” a smooth piece of bedrock, and “Skyline Trail,” a dark float rock. ChemCam will also collect chemical data of Skyline Trail, “Big Tujunga” — which is similar to Strawberry Peak — and “Momyer.” We’ll also take the first part of a 360-degree color mosaic with Mastcam!
In the third sol of the plan, we’ll complete the 360-degree mosaic and continue driving to the southwest along our strategic route. The fourth sol is pretty quiet, with some atmospheric observations and a ChemCam AEGIS. Atmospheric observations are additionally sprinkled throughout other sols of the plan. This time of year we are particularly interested in studying the clouds above Gale crater!
I’m looking forward to the nice long weekend, and returning on Tuesday morning to see everything Curiosity accomplished.
Written by Abigail Fraeman, Planetary Geologist at NASA’s Jet Propulsion Laboratory
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Last Updated Feb 17, 2025 Related Terms
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Sols 4452-4453: Keeping Warm and Keeping Busy
NASA’s Mars rover Curiosity acquired this image of the science targets before it, including “Catalina Island,” the flat rock at image center, using its Left Navigation Camera. The rover captured the image on sol 4450 — or Martian day 4,450 of the Mars Science Laboratory mission — on Feb. 11, 2025, at 13:11:14 UTC. NASA/JPL-Caltech Earth planning date: Wednesday, Feb. 12, 2025
I woke up this morning to my weather app telling me it felt like minus 15° C (5°F) outside. On days like this, it can take me a little longer to get myself up and out into the world. Curiosity has a similar problem — as we head toward winter and it gets colder and colder in Gale Crater, Curiosity has to spend more time warming up to do things like driving and all our good science. I’ve also been watching a couple winter storms that are expected in the next few days here in Toronto. Luckily, Curiosity doesn’t have to deal with snowstorms, and our drive in the last plan went ahead as planned and put us in a good position to go ahead with contact science today, a relief after having to forego it on Monday.
The contact science location that the geology team chose is called “Catalina Island,” the flat rock you can see in almost the center of the image above. As you can likely also see above, there’s a whole jumble of rocks in that image, and Mastcam and ChemCam have picked out a couple others to take a look at. These are “Point Dume,” which will be the target of ChemCam’s laser spectrometer, and “Whittier Narrows,” on which Mastcam will image some linear features. Mastcam and ChemCam are also turning their gazes further afield for Mastcam targets “Cleghorn Ridge,” “Cuyamaca Peak,” “Kratka Ridge,” and two long-distance ChemCam mosaics of the top of the Wilkerson butte and a spot a little further down known as “Pothole Trail.”
Much like I’m keeping an eye out the window on the changing weather here, Curiosity is also continuing to keep an eye on the environment in Gale Crater. Even though it’s not the dusty season, we continue to monitor the dust around us and in the atmosphere with a dust-devil survey and a tau. But we’re especially interested in what the clouds are up to right now, which we’re checking in on with our normal zenith and suprahorizon movies, and our cloud-season-only Phase Function Sky Survey. This is a series of movies covering the whole sky that we can use to determine how sunlight interacts with the individual water-ice crystals in the clouds.
Written by Alex Innanen, Atmospheric Scientist at York University
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