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By NASA
NASA’s TRACERS (Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites) mission launched at 2:13 p.m. EDT atop a SpaceX Falcon 9 rocket at Space Launch Complex 4 East at Vandenberg Space Force Base in California. Credit: SpaceX NASA’s newest mission, TRACERS, soon will begin studying how Earth’s magnetic shield protects our planet from the effects of space weather. Short for Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites, the twin TRACERS spacecraft lifted off at 11:13 a.m. PDT (2:13 p.m. EDT) Wednesday aboard a SpaceX Falcon 9 rocket from Space Launch Complex 4 East at Vandenberg Space Force Base in California.
“NASA is proud to launch TRACERS to demonstrate and expand American preeminence in space science research and technology,” said acting NASA Administrator Sean Duffy. “The TRACERS satellites will move us forward in decoding space weather and further our understanding of the connection between Earth and the Sun. This mission will yield breakthroughs that will advance our pursuit of the Moon, and subsequently, Mars.”
The twin satellites will fly one behind the other – following as closely as 10 seconds apart over the same location – and will take a record-breaking 3,000 measurements in one year to build a step-by-step picture of how magnetic reconnection changes over time.
Riding along with TRACERS aboard the Falcon 9 were NASA’s Athena EPIC (Economical Payload Integration Cost), PExT (Polylingual Experimental Terminal), and REAL (Relativistic Electron Atmospheric Loss) missions – three small satellites to demonstrate new technologies and gather scientific data. These three missions were successfully deployed, and mission controllers will work to contact them over the coming hours and days.
Ground controllers for the TRACERS mission established communications with the second of the two spacecraft at 3:43 p.m. PDT (6:43 p.m. EDT), about 3 hours after it separated from the rocket. During the next four weeks, TRACERS will undergo a commissioning period during which mission controllers will check out their instruments and systems.
Once cleared, the twin satellites will begin their 12-month prime mission to study a process called magnetic reconnection, answering key questions about how it shapes the impacts of the Sun and space weather on our daily lives.
“NASA’s heliophysics fleet helps to safeguard humanity’s home in space and understand the influence of our closest star, the Sun,” said Joe Westlake, heliophysics division director at NASA Headquarters in Washington. “By adding TRACERS to that fleet, we will gain a better understanding of those impacts right here at Earth.”
The two TRACERS spacecraft will orbit through an open region in Earth’s magnetic field near the North Pole, called the polar cusp. Here, TRACERS will investigate explosive magnetic events that happen when the Sun’s magnetic field – carried through space in a stream of solar material called the solar wind – collides with Earth’s magnetic field. This collision creates a buildup of energy that causes magnetic reconnection, when magnetic field lines snap and explosively realign, flinging away nearby particles at high speeds.
Flying through the polar cusp allows the TRACERS satellites to study the results of these magnetic explosions, measuring charged particles that race down into Earth’s atmosphere and collide with atmospheric gases – giving scientist the tools to reconstruct exactly how changes in the incoming solar wind affect how, and how quickly, energy and particles are coupled into near-Earth space.
“The successful launch of TRACERS is a tribute to many years of work by an excellent team,” said David Miles, TRACERS principal investigator at the University of Iowa. “TRACERS is set to transform our understanding of Earth’s magnetosphere. We’re excited to explore the dynamic processes driving space weather.”
Small Satellites Along for Ride
Athena EPIC is a pathfinder mission that will demonstrate NASA’s use of an innovative and configurable commercial SmallSat architecture to improve flexibility of payload designs, reduce launch schedule, and reduce overall costs in future missions, as well as the benefits of working collaboratively with federal partners. In addition to this demonstration for NASA, once the Athena EPIC satellite completes its two-week commissioning period, the mission will spend the next 12 months taking measurements of outgoing longwave radiation from Earth.
The PExT demonstration will test interoperability between commercial and government communication networks for the first time by demonstrating a wideband polylingual terminal in low Earth orbit. This terminal will use software-defined radios to jump between government and commercial networks, similar to cell phones roaming between providers on Earth. These terminals could allow future missions to switch seamlessly between networks and access new commercial services throughout its lifecycle in space.
The REAL mission is a CubeSat that will investigate how energetic electrons are scattered out of the Van Allen radiation belts and into Earth’s atmosphere. Shaped like concentric rings high above Earth’s equator, the Van Allen belts are composed of a mix of high-energy electrons and protons that are trapped in place by Earth’s magnetic field. Studying electrons and their interactions, REAL aims to improve our understanding of these energetic particles that can damage spacecraft and imperil astronauts who pass through them.
The TRACERS mission is led 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 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.
The Athena EPIC mission is led by NASA’s Langley Research Center in Hampton, Virginia, and is a partnership between National Oceanic and Atmospheric Administration, U.S. Space Force, and NovaWurks. Athena EPIC’s launch is supported by launch integrator SEOPS. The PExT demonstration is managed by NASA’s SCaN (Space Communications and Navigation) program in partnership with Johns Hopkins Applied Physics Laboratory, with launch support by York Space Systems. The REAL project is led by Dartmouth College in Hanover, New Hampshire, and is a partnership between Johns Hopkins Applied Physics Laboratory, Montana State University, and Boston University. Sponsored by NASA’s Heliophysics Division and CubeSat Launch Initiative, it was included through launch integrator Maverick Space Systems.
NASA’s Launch Services Program, based at the agency’s Kennedy Space Center in Florida, manages the VADR (Venture-class Acquisition of Dedicated and Rideshare) contract.
To learn more about TRACERS, visit:
https://nasa.gov/tracers
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Abbey Interrante / Karen Fox
Headquarters, Washington
301-201-0124 / 202-358-1600
abbey.a.interrante@nasa.gov / karen.c.fox@nasa.gov
Sarah Frazier
Goddard Space Flight Center, Greenbelt, Maryland
202-853-7191
sarah.frazier@nasa.gov
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Last Updated Jul 23, 2025 LocationNASA Headquarters Related Terms
TRACERS Earth Science Science Mission Directorate View the full article
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By NASA
6 Min Read NASA’s TRACERS Studies Explosive Process in Earth’s Magnetic Shield
High above us, particles from the Sun hurtle toward Earth, colliding with the upper atmosphere and creating powerful explosions in a murky process called magnetic reconnection. A single magnetic reconnection event can release as much energy as the entire United States uses in a day.
NASA’s new TRACERS (Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites) mission will study magnetic reconnection, answering key questions about how it shapes the impacts of the Sun and space weather on our daily lives.
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NASA’s TRACERS mission, or the Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites, will fly in low Earth orbit through the polar cusps, funnel-shaped holes in the magnetic field, to study magnetic reconnection and its effects in Earth’s atmosphere. NASA’s Goddard Space Flight Center The TRACERS spacecraft are slated to launch no earlier than late July 2025 aboard a SpaceX Falcon 9 rocket from Space Launch Complex 4 East at Vandenberg Space Force Base in California. The two TRACERS spacecraft will orbit Earth to study how the solar wind — a continuous outpouring of electrically charged particles from the Sun — interacts with Earth’s magnetic shield, the magnetosphere.
What Is Magnetic Reconnection?
As solar wind flows out from the Sun, it carries the Sun’s embedded magnetic field out across the solar system. Reaching speeds over one million miles per hour, this soup of charged particles and magnetic field plows into planets in its path.
“Earth’s magnetosphere acts as a protective bubble that deflects the brunt of the solar wind’s force. You can think of it as a bar magnet that’s rotating and floating around in space,” said John Dorelli, TRACERS mission science lead at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “As the solar wind collides with Earth’s magnetic field, this interaction builds up energy that can cause the magnetic field lines to snap and explosively fling away nearby particles at high speeds — this is magnetic reconnection.”
Openings in Earth’s magnetic field at the North and South Poles, called polar cusps, act as funnels allowing charged particles to stream down towards Earth and collide with atmospheric gases. These phenomena are pieces of the space weather system that is in constant motion around our planet — whose impacts range from breathtaking auroras to disruption of communications systems and power grids. In May 2024, Earth experienced the strongest geomagnetic storm in over 20 years, which affected high-voltage power lines and transformers, forced trans-Atlantic flights to change course, and caused GPS-guided tractors to veer off-course.
How Will TRACERS Study Magnetic Reconnection?
The TRACERS mission’s twin satellites, each a bit larger than a washing machine, will fly in tandem, one behind the other, in a relatively low orbit about 360 miles above Earth. Traveling over 16,000 mph, each satellite hosts a suite of instruments to measure different aspects of extremely hot, ionized gas called plasma and how it interacts with Earth’s magnetosphere.
An artist’s concept of the twin TRACERS satellites in orbit above Earth. NASA’s Goddard Space Flight Center The satellites will focus where Earth’s magnetic field dips down to the ground at the North polar cusp. By placing the twin TRACERS satellites in a Sun-synchronous orbit, they always pass through Earth’s dayside polar cusp, studying thousands of reconnection events at these concentrated areas.
This will build a step-by-step picture of how magnetic reconnection changes over time and from Earth’s dayside to its nightside.
NASA’s TRICE-2 mission also studied magnetic reconnection near Earth, but with a pair of sounding rockets launched into the northern polar cusp over the Norwegian Sea in 2018.
“The TRICE mission took great data. It took a snapshot of the Earth system in one state. It proved that these instruments could make this kind of measurement and achieve this kind of science,” said David Miles, TRACERS principal investigator at the University of Iowa. “But the system’s more complicated than that. The TRACERS mission demonstrates how you can use multi-spacecraft technology to get a picture of how things are moving and evolving.”
The TRACERS mission demonstrates how you can use multi-spacecraft technology to get a picture of how things are moving and evolving.
DAVID MILES
TRACERS principal investigator, University of Iowa
Since previous missions could only take one measurement of an event per launch, too many changes in the region prevented forming a full picture. Following each other closely in orbit, the twin TRACERS satellites will provide multiple snapshots of the same area in rapid succession, spaced as closely as 10 seconds apart from each other, reaching a record-breaking 3,000 measurements in one year. These snapshots will build a picture of how the whole Earth system behaves in reaction to space weather, allowing scientists to better understand how to predict space weather in the magnetosphere.
Working Across Missions in Solar Harmony
The TRACERS mission will collaborate with other NASA heliophysics missions, which are strategically placed near Earth and across the solar system. At the Sun, NASA’s Parker Solar Probe closely observes our closest star, including magnetic reconnection there and its role in heating and accelerating the solar wind that drives the reconnection events investigated by TRACERS.
Data from recently launched NASA missions, EZIE (Electrojet Zeeman Imaging Explorer), studying electrical currents at Earth’s nightside, and PUNCH (Polarimeter to Unify the Corona and Heliosphere) studying the solar wind and interactions in Earth’s atmosphere, can be combined with observations from TRACERS. With research from these missions, scientists will be able to get a more complete understanding of how and when Earth’s protective magnetic shield can suddenly connect with solar wind, allowing the Sun’s material into Earth’s system.
“The TRACERS mission will be an important addition to NASA’s heliophysics fleet.” said Reinhard Friedel, TRACERS program scientist at NASA Headquarters in Washington. “The missions in the fleet working together increase understanding of our closest star to improve our ability to understand, predict, and prepare for space weather impacts on humans and technology in space.”
The TRACERS mission is led 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 NASA’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 VADR (Venture-class Acquisition of Dedicated and Rideshare) contract.
by Desiree Apodaca
NASA’s Goddard Space Flight Center, Greenbelt, Md.
Header Image:
An artist’s concept of the TRACERS mission, which will help research magnetic reconnection and its effects in Earth’s atmosphere.
Credits: Andy Kale
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Last Updated Jul 16, 2025 Related Terms
Goddard Space Flight Center Earth’s Magnetic Field Heliophysics Heliophysics Division The Sun The Sun & Solar Physics TRACERS Explore More
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By NASA
The TRACERS (Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites) mission will help scientists understand an explosive process called magnetic reconnection and its effects in Earth’s atmosphere. Credit: University of Iowa/Andy Kale NASA will hold a media teleconference at 11 a.m. EDT on Thursday, July 17, to share information about the agency’s upcoming Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites, or TRACERS, mission, which is targeted to launch no earlier than late July.
The TRACERS mission is a pair of twin satellites that will study how Earth’s magnetic shield — the magnetosphere — protects our planet from the supersonic stream of material from the Sun called solar wind. As they fly pole to pole in a Sun-synchronous orbit, the two TRACERS spacecraft will measure how magnetic explosions send these solar wind particles zooming down into Earth’s atmosphere — and how these explosions shape the space weather that impacts our satellites, technology, and astronauts.
Also launching on this flight will be 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 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.
Audio of the teleconference will stream live on the agency’s website at:
nasa.gov/live
Participants include:
Joe Westlake, division director, Heliophysics, NASA Headquarters Kory Priestley, principal investigator, Athena EPIC, NASA Langley Greg Heckler, deputy program manager for capability development, SCaN, NASA Headquarters David Miles, principal investigator for TRACERS, University of Iowa Robyn Millan, REAL principal investigator, Dartmouth College To participate in the media teleconference, media must RSVP no later than 10 a.m. on July 17 to Sarah Frazier at: sarah.frazier@nasa.gov. NASA’s media accreditation policy is available online.
The TRACERS mission will launch on a SpaceX Falcon 9 rocket from Space Launch Complex 4 East at Vandenberg Space Force Base in California.
This mission is led by David Miles at the University of Iowa with support from the Southwest Research Institute in San Antonio. NASA’s Heliophysics Explorers Program Office at the agency’s Goddard Space Flight Center in Greenbelt, Maryland, manages the mission for the agency’s HeliophysicsDivision at NASA Headquarters in Washington. The University of Iowa, Southwest Research Institute, University of California, Los Angeles, and University of California, Berkeley, all lead instruments on TRACERS that will study changes in the Earth’s magnetic field and electric field. NASA’s Launch Services Program, based at the agency’s Kennedy Space Center in Florida, manages the Venture-class Acquisition of Dedicated and Rideshare contract.
To learn more about TRACERS, please visit:
nasa.gov/tracers
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Abbey Interrante / Karen Fox
Headquarters, Washington
301-201-0124 / 202-358-1600
abbey.a.interrante@nasa.gov / karen.c.fox@nasa.gov
Sarah Frazier
Goddard Space Flight Center, Greenbelt, Maryland
202-853-7191
sarah.frazier@nasa.gov
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Details
Last Updated Jul 10, 2025 LocationNASA Headquarters Related Terms
Earth Heliophysics Science Mission Directorate Solar Wind TRACERS View the full article
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