NASA’s TRACERS (Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites) spacecraft are targeting launch aboard a SpaceX Falcon 9 rocket during a launch window that opens at 2:13 p.m. EDT (11:13 a.m. PDT) on Tuesday, July 22. The TRACERS mission and three NASA small satellites will launch from Space Launch Complex 4 East at Vandenberg Space Force Base in California.

The TRACERS mission will study how the solar wind, the continuous stream of ionized particles escaping the Sun and pouring out into space, interacts with Earth’s magnetosphere, the region around Earth dominated by our planet’s magnetic field. Understanding this region and space weather patterns is paramount in our increasingly technologically driven society, as space weather events can affect our power grids and communications satellites, and create potentially hazardous conditions for astronauts.

Also launching on this flight are three additional NASA-funded payloads. The Athena EPIC (Economical Payload Integration Cost) SmallSat, led by NASA’s Langley Research Center in Hampton, Virginia, is designed to demonstrate an innovative, configurable way to put remote-sensing instruments into orbit faster and more affordably. The Polylingual Experimental Terminal (PExT) technology demonstration, managed by the agency’s SCaN (Space Communications and Navigation) Program, will showcase new technology that empowers missions to roam between communications networks in space, like cell phones roam between providers on Earth.

Finally, the Relativistic Electron Atmospheric Loss (REAL) CubeSat, led by Dartmouth College in Hanover, New Hampshire, will use space as a laboratory to understand how high-energy particles within the bands of radiation that surround Earth are naturally scattered into the atmosphere, aiding the development of methods for removing these damaging particles to better protect satellites and the critical ground systems they support. The REAL mission is the first CubeSat to launch for the state of New Hampshire as part of NASA’s CubeSat Launch Initiative, which provides low-cost access to space for U.S. educational institutions, informal educational institutions such as museums and science centers, non-profits with educational and outreach components, as well as NASA centers for early career workforce development. With REAL, 39 U.S. states, the District of Columbia, and Puerto Rico will have launched as part of the initiative.

The TRACERS mission is led and managed by David Miles at the University of Iowa with support from the Southwest Research Institute in San Antonio, Texas. NASA’s Heliophysics Explorers Program Office at the agency’s Goddard Space Flight Center in Greenbelt, Maryland, manages the mission for the agency’s Heliophysics Division at NASA Headquarters in Washington. The University of Iowa, Southwest Research Institute, University of California, Los Angeles, and the University of California, Berkeley, all lead instruments on TRACERS that study changes in the magnetic field and electric field. NASA’s Launch Services Program, based at the agency’s Kennedy Space Center in Florida, manages the agency’s VADR (Venture-class Acquisition of Dedicated and Rideshare) contract.

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Editor’s note: This post has been updated on June 17, 2025, with more information on the target launch date.

NASA’s TRACERS (Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites) twin spacecraft have completed the final pre-shipment tests and have arrived at Vandenberg Space Force Base in California in preparations for launch later this year.

The TRACERS mission will study how the solar wind, the continuous stream of ionized particles escaping the Sun and pouring out into space, interacts with Earth’s magnetosphere, the region around Earth dominated by our planet’s magnetic field. Understanding this region and space weather patterns is paramount in our increasingly technologically driven society, as space weather events can affect our power grids and communications satellites, and create potentially hazardous conditions for astronauts.

When the solar wind first meets Earth’s magnetosphere, an explosive event called magnetic reconnection occurs. A reconnection event can shoot solar wind particles, normally diverted around our planet, directly into our atmosphere at high speeds. These particles provide the power that ignites the beautiful northern and southern lights, known as auroras, and help drive space weather on Earth.

After Millennium Space Systems built the two spacecraft, the team integrated the instruments, and the spacecraft passed several rigorous environmental, mechanical, and systems verification tests. These tests are to ensure the mission is fully prepared for space, with additional pre-launch tests planned to validate final readiness. The TRACERS’ twin satellites will fly in tandem — one behind the other — through the polar cusps, funnel-shaped regions where Earth’s magnetic field opens over the north and south poles. This will allow scientists to observe how quickly reconnection changes and evolves by comparing data collected by each satellite.

Now at Vandenberg, technicians will integrate the TRACERS spacecraft with the launch vehicle, a SpaceX Falcon 9 rocket, and conduct final preparations for launch. Launch is targeted for no earlier than late July 2025 from Space Launch Complex 4 East at Vandenberg Space Force Base.

The TRACERS mission is led and managed by David Miles at the University of Iowa with support from the Southwest Research Institute in San Antonio, Texas. NASA’s Heliophysics Explorers Program Office at the agency’s Goddard Space Flight Center in Greenbelt, Maryland, provides mission oversight to the project for the Heliophysics Division at NASA Headquarters in Washington. NASA’s Launch Services Program, based at the agency’s Kennedy Space Center in Florida, manages the agency’s VADR (Venture-class Acquisition of Dedicated and Rideshare) contract.

By Desiree Apodaca
NASA’s Goddard Space Flight Center, Greenbelt, Md.

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NASA’s TRACERS (Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites) now is targeting no earlier than summer 2025 for launch in order to give the mission spacecraft team additional time to prepare.

The mission is a pair of satellites that will study how the solar wind — the continuous stream of ionized particles escaping the Sun and pouring out into space — interacts with and enters Earth’s magnetosphere, the region around Earth dominated by our planet’s magnetic field. Researching this interaction is critical for understanding and eventually predicting how energy from our Sun transfers into our planet and potentially impacts space- and ground-based assets.

The TRACERS spacecraft will lift off aboard a SpaceX Falcon 9 rocket from Space Launch Complex 4 East at Vandenberg Space Force Base in California.

After launch, the twin satellites will fly about 341 miles above Earth through a narrow region in Earth’s magnetic field known as polar cusps, where solar wind is funneled into our atmosphere in a concentrated way. The TRACERS mission will fly through the northern polar cusp several times a day to study where and how often a phenomenon called magnetic reconnection happens at the outer edges of Earth’s magnetic field.

Magnetic reconnection, an explosive transfer of energy that can happen when two magnetic fields meet, happens throughout space but is of special relevance where the solar wind first meets Earth’s magnetosphere, a region known as the magnetopause. A reconnection event can shoot solar wind particles, normally diverted around our planet, directly into our atmosphere at high speeds. These particles ignite the beautiful northern and southern lights but also create potentially hazardous conditions for astronauts and sensitive satellites and can damage key infrastructure on the ground, affecting communication signals and aviation.

The TRACERS mission is led by David Miles at the University of Iowa and managed by the Southwest Research Institute in San Antonio. NASA’s Heliophysics Explorers Program Office at the agency’s Goddard Space Flight Center in Greenbelt, Maryland, provides mission oversight to the project for the Heliophysics Division at NASA Headquarters in Washington. NASA’s Launch Services Program, based at the agency’s Kennedy Space Center in Florida, in partnership with NASA’s Science Mission Directorate is providing the launch service as part of the agency’s VADR (Venture-class Acquisition of Dedicated and Rideshare) contract.

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The twin spacecraft of NASA’s TRACERS (Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites) mission were recently completed, in preparation for launch in 2025.

The TRACERS mission is a pair of satellites that will study how the solar wind, the continuous stream of ionized particles escaping the Sun and pouring out into space, interacts with Earth’s magnetosphere, the region around Earth dominated by our planet’s magnetic field. The mission will help answer key questions about how the Sun influences Earth, and ultimately drives space weather that impacts technology and communications.

Specifically, TRACERS will study the phenomenon of magnetic reconnection, an explosive transfer of energy that can happen when two magnetic fields meet.

Magnetic reconnection happens throughout space but is of special relevance to us where the solar wind first meets Earth’s magnetosphere, a region known as the magnetopause. A reconnection event can shoot solar wind particles, normally diverted around our planet, directly into our atmosphere at high speeds. These particles ignite the beautiful northern and southern lights, known as aurora, and help drive space weather on Earth. Understanding space weather patterns is paramount in our increasingly technologically driven society, as space weather events can affect our power grids and communications satellites, and create potentially hazardous conditions for astronauts.

To study magnetic reconnection at Earth’s magnetopause, TRACERS’ twin satellites will fly in tandem — one behind the other — through the polar cusps, funnel-shaped regions where Earth’s magnetic field opens over the north and south poles. This will allow scientists to observe how quickly reconnection changes and evolves by comparing data collected by each satellite.

Millennium Space Systems, a Boeing company, finished building the two satellites for the TRACERS mission in October 2024. The team is completing integration of the TRACERS instruments, and the two satellites will enter the testing phase. Once testing is completed, the spacecraft will be shipped to Vandenberg Space Force Base in California for integration with the launch vehicle.

“It’s exciting to see the TRACERS instruments and the two spacecraft come together. The team is making excellent progress toward launch,” said David Miles, TRACERS principal investigator at the University of Iowa in Iowa City.

In addition, the mission successfully passed a critical review, called Key Decision Point D, on Aug. 8, 2024, preparing TRACERS to achieve a target launch readiness date no earlier than April 2025. With the successful review, TRACERS moved into Phase D, the official transition from the mission’s development stage to the delivery of the spacecraft, testing, assembly, and integration into the launch vehicle in preparation for launch.

“This team has been truly incredible,” says Skyler Kleinschmidt, TRACERS program executive at NASA Headquarters in Washington. “Building a spacecraft is never easy, but seeing the team work together through all of the challenges that they have encountered is inspiring.

The TRACERS mission is led by David Miles at the University of Iowa and managed by the Southwest Research Institute in San Antonio. NASA’s Heliophysics Explorers Program Office at the agency’s Goddard Space Flight Center in Greenbelt, Maryland, provides mission oversight to the project for the agency’s Heliophysics Division at NASA Headquarters in Washington.

By Desiree Apodaca
NASA’s Goddard Space Flight Center, Greenbelt, Md.

The post Spacecraft Completed for NASA’s TRACERS Mission, Key Milestone Passed appeared first on NASA Science.

NASA’s Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites mission, or TRACERS mission, has passed a critical mission review on March 31, 2022. The mission now moves into its next phase, advancing towards its target launch readiness date of July 27, 2024.

“We’re excited to pass this major milestone and get one step closer to launch,” said Prof. Craig Kletzing, space physicist at the University of Iowa in Iowa City and the mission’s principal investigator.

The review, Key Decision Point C, evaluated the mission’s preliminary design and program plan to achieve launch by its target launch readiness. With the successful review, TRACERS now moves into Phase C, which includes the final design of the mission and building of the two satellites.

“TRACERS will be an important addition to our heliophysics fleet,” said Washito Sasamoto, program executive for the mission at NASA Headquarters in Washington, D.C. “The mission is targeting long-standing questions critical to understanding the Sun-Earth system.”

TRACERS is a pair of satellites that will study how the solar wind, the continuous stream of ionized particles escaping the Sun and pouring out the space, interacts with Earth’s magnetosphere, the region around Earth dominated by our planet’s magnetic field. The linchpin of that interaction is the phenomenon of magnetic reconnection, an explosive transfer of energy that can happen when two magnetic fields meet.

Magnetic reconnection happens all throughout space but is of special relevance where the solar wind first meets Earth’s magnetosphere, a region known as the magnetopause. A reconnection event can shoot solar wind particles, normally diverted around our planet, directly into our atmosphere at high speeds. These particles ignite the beautiful northern and southern lights but also create potentially hazardous conditions for astronauts and sensitive satellites.

To study magnetic reconnection at Earth’s magnetopause, TRACERS will fly through the polar cusp, a point where Earth’s magnetic field dips down toward the ground. There, particles funnel through the cusp into a concentrated part of our atmosphere.

“Magnetic reconnection can happen in lots of places in the magnetopause, but it’s hard to survey such a giant search space,” Kletzing said. “The cusp is one place where can study the signatures of reconnection that happen all over.”

TRACERS will repeatedly fly through the northern polar cusp, one satellite behind the other, to study where and how often reconnection happens at the outer edges of Earth’s magnetic field. These measurements are critical for understanding and eventually predicting how energy from our Sun transfers into our planet.

TRACERS is led by Craig Kletzing at the University of Iowa and managed by the Southwest Research Institute in San Antonio, Texas. NASA’s Heliophysics Explorers Program Office at NASA’s Goddard Space Flight Center in Greenbelt, Maryland provides mission oversight to the project for the agency’s Heliophysics Division at NASA Headquarters in Washington, D.C.

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Story by Richard C. Lewis
Photography by Tim Schoon

You don’t need big-city credentials to work with NASA.

Just ask Andrew Carton and Ryan Helland. Each hails from a small town in Iowa, discovered a love for physics at the University of Iowa, and soon after graduating scored jobs on a space mission that is the largest externally funded research endeavor in university history.

The Iowa-led mission, Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites (TRACERS), received $115 million from NASA to study the mysterious, powerful interactions between the magnetic fields of the Sun and Earth. TRACERS is part of a larger initiative, NASA’s Explorers Program, studying how the Sun affects space and the space environment around planets.

Carton and Helland were hired to the TRACERS team within months of graduating from Iowa in May 2020. Carton is overseeing the development of a circuit board critical to the research, and Helland is helping to build a magnetic search coil that will measure magnetic fields.

Neither expected such an opportunity so soon after graduation.

“You feel like you’re doing something important, and at a high level, that’s going to further your career,” Helland says. “It’s very lucky for me, my first job working on a NASA grant this big.”

“I would say that it makes me feel very privileged and very humble,” Carton adds, “to be at my age in the position that I am.”

Helland grew up on a third-generation family farm outside Huxley, in central Iowa. Carton comes from Earlville, a community of about 800 in eastern Iowa. They came to Iowa unsure what they wanted to achieve but found academic opportunities and people eager to help them succeed.

Helland learned about physics at the university when he visited a professor, Vincent Rodgers, to ask him about concepts he had come across while reading a book on quantum mechanics. Before he knew it, Rodgers had invited him to attend meetings involving his research group.

“Here I am, a freshman sitting in on his research meetings,” recalls Helland. “It was really cool.”

Carton became interested in physics when he learned about Iowa’s long, distinguished history of space discoveries while taking an introductory physics class taught by Craig Kletzing, the lead scientist on the TRACERS mission and the Donald A. and Marie B. Gurnett Chair in the Department of Physics and Astronomy.

“I remember him talking about James Van Allen (longtime Iowa professor who pioneered space research and discovered radiation belts around Earth), why the building was named after him, why the radiation belts are named after him,” Carton says. “It was the first time I had heard of all that.”

Helland switched his major to physics soon after that first meeting with Rodgers. During the summer after his first year, Helland was working in the department’s machine shop when he had a serendipitous encounter with George Hospodarsky, a research scientist in the Department of Physics and Astronomy.

“I was moving a shelf for him, and we got to talking, and he liked me, and he hired me as a student data analyst,” Helland says.

Helland analyzed information coming from Juno, a NASA spacecraft orbiting Jupiter.

“Dr. Hospodarsky had me looking at data about lightning on Jupiter,” Helland says. “Just thinking there is a lightning strike happening across space, and we’re getting the data about it in Van Allen Hall—that’s just pretty crazy.”

Carton, an electrical and computer engineering major, remembers one episode when he overheard a student named Suman Sherwani—now working at SpaceX—ask her adviser for guidance about which of two NASA internships to accept.

“I was literally wearing a NASA sweatshirt at the time, and I was like, ‘Wait, did you say these internships came because of Iowa?'” Carton says. “It was the first time I realized there were opportunities directly out of college here.”

Now, Carton and Helland are the ones who realized the opportunities at Iowa.

“If you just talk to people, if you can muster the courage to talk to a professor and be involved, you’re going to get somewhere,” Helland says.

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